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Please, don't try anything that you're about to see us do at home.

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Ever.

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That looks like it worked.

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And Grant Carriantori hit the rough road...

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Faster! Yeah!

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...to prove driving faster leads to a smoother ride.

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Ready for your 45-mile-an-hour run.

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Paramedics are nowhere to be found.

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Who are the myth busters?

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Adam Savage.

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And Jamie Heineman.

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This is gonna kill you.

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Between them more than 30 years of special effects experience.

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That's what I'm talking about!

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Joining them, Tori Belleggi.

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Very excited about this.

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Carri Byron.

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Look, he cracked into his skull.

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And Grant Imahara.

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Don't say anything.

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They don't just tell the myths.

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They put them to the test.

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And now, we're talking about the myth.

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What is the myth?

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Well, apparently there are some car stereo systems that are so powerful

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that they're capable of destroying the car that houses them.

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We're not talking about, like, destruction over time, right?

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Not bolts rattling loose over a period of weeks.

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This is turning on the power of the car.

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And the power of the car is the power of the car.

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Destruction over time, right?

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Not bolts rattling loose over a period of weeks.

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This is, turn on the stereo and the car just becomes a junker, right?

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That's correct. Or it explodes.

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When it comes to the size of a man's subwoofer,

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big is not only better, it's essential.

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Some guys just have to play it loud to be proud.

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But is it possible to make your mobile sound system so powerful

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that when you crank the dial to 11,

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the car explodes?

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So what's the plan?

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Well, this time I think we need to get right into it and just go big.

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Hell bent for leather, no shop tests, no small scale.

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Just build the biggest subwoofer we can.

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That's right. The biggest thing, we can possibly fit in that car

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and go for maximum decibels.

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And hopefully, max destruction.

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So it's a simple plan.

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Build the most powerful subwoofer possible

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and if that doesn't destroy the car, then nothing will.

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But how can mere sound destroy something as solid as a car?

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Okay, so we know a speaker produces sound.

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It does this by switching an electromagnet on and off

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and vibrating the speaker cone.

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This moves air back and forth, creating waves of pressure.

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This sound pressure level is measured in decibels

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and in theory, with enough decibels,

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enough pressure, you can break anything.

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And Jamie and Adam have already proved just that.

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On this classic episode, they confirmed the destructive potential of sound

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by hitting the right note.

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But on breaking glass, the key ingredient was finding the resonant frequencies

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of the crystal.

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To shatter a car, this car, they won't be messing around with sound quality.

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They want decibels and lots of them.

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Alright, let's get her off the ground.

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Yeah!

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With the car in position, it's time to begin the super-sized subwoofer installation.

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Step one, make room by removing all mod-cons and luxury extras,

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like the front seats.

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You could make a robot out of one of those seats.

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I think I could make a robot out of one of these.

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The back seats...

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Oh!

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...and the steering wheel.

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Now, this is cool. I want this.

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A typical subwoofer has a cone size of around 10 inches.

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But in true myth-buster fashion, the myth-woofer will be anything but typical.

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It's 52 inches.

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Oh, man.

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Which means we're talking probably a four-foot speaker cone.

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The myth-woofer is a four-foot speaker cone.

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So, finally, a myth from our Australian contingent,

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although I would imagine that anybody who spent time driving on dirt roads would know this one.

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The myth is, if you're driving on a rough dirt road,

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it's better to drive fast because it smooths out the ride.

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Okay, so how exactly do you get these mythical good vibrations?

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Apparently, at slow speeds, the wheels of the vehicle have time to drop down into the troughs of each bump,

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resulting in more bounce than a kangaroo on a trampoline.

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But according to the myth, if you put your foot down,

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the wheels skip across the tops of the car regations,

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giving the passengers a much smoother ride.

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Well, you know, that sounds pretty easy to test, isn't it?

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What are you going to do?

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Just go out and get a bunch of cars and test them on rough road?

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You know, I'm not sure it's that simple, Jamie,

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because, I mean, you guys have to figure out a way of measuring the vibration that's happening to the car

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under different speeds and different road conditions, right?

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First things first, they're going to need a car.

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This is a 1978 Oldsmobile Cutlass Suprem.

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Listen to that, baby, fur!

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And to measure the rough road ahead,

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this old classic is going to need a myth-busters makeover.

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To objectively record the vibration intensity at different speeds,

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they have three systems in mind.

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Tori has an idea for a suspension gauge.

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Grant will crunch the numbers on a three-axis accelerometer,

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but Carrie steps up with a more elegant solution.

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I love that.

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I'm making a system to measure how rough each of the road trials is,

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and to do that, I'm using all of these wonderful crystal chardonnay glasses

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and making them into a pyramid.

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Because the road makes the car tumble,

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the water should spill out from the top and kind of trickle down into the lower glasses

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and maybe spill out altogether.

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And at the end, we should have a really good representation of the roughness

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between a 15-mile-an-hour drive and, say, a 50-mile-an-hour drive.

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So, after each test, using the 100-mil marks,

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they'll simply calculate the total amount of water lost.

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The bumpy of the ride, the wetter the designated driver is going to get.

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Meanwhile, Tori is rigging system number two, the suspension deflection gauge.

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He first welds a metal rod or needle to the suspension of the car.

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Then he attaches a scale to the hood. Impressive. But how does it work?

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So the needle stays with the suspension,

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and our scale stays with the body of the car.

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This way, we can see how much distance the two are, you know, traveling.

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Their next task is to rig the car for Carrie's glass pyramid.

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To make room and provide a flat surface, Grant removes the passenger seat

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and replaces it with a wooden platform.

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Now, to get the pyramid in the car.

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I think we should drain this before trying to fit it in there

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because there'll be a lot of fussing around to get it in.

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Maybe this is a good time to take a...

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break.

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After the break, Grant and Tori hit the rough road.

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And doctors Savage and Heinemann perform open car surgery.

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The Myth Busters way.

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In the myth that a car stereo can destroy a car,

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Adam and Jamie have, well, destroyed a car.

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They've made space for their mythical shattering subwoofer, the myth woofer.

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Now, they have to work out how to power it.

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Normally, speakers are powered with an electromagnet.

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It repels and attracts a permanent magnet.

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And because it's electronic, it can do this very rapidly.

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It can vary the amplitude and the frequency of the signal.

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That's how you get music and all sorts of good sounds out of speaker.

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We don't need that.

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We're only interested in one thing, and that's maximum amplitude.

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So how are they going to supply enough juice to their super-sized subwoofer to blow up a car?

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I figure just go directly to an engine.

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You know, we can get a crank, we can go right to the output of an engine,

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we get raw power.

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That's what we're going to do.

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It's another Myth Buster first.

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A diesel-powered speaker.

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To harness the engine's raw power, they'll need access to the transmission.

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So Adam and Jamie get cutting and open up the bodywork.

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From the top and the bottom.

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Where they find the drive shaft.

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This is beautiful.

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That's the best news I've had all day.

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Is the perfect size and shape for their mechanically powered speaker plans.

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The next step is to build a mechanical device called a crankshaft.

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The crucial link in the Myth Woofer's power chain.

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This is the crankshaft that is going to, via a pushrod, push the speaker cone up and down.

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So what we've done is very carefully align all this stuff,

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and now I've got a welded in place so that it works like a crankshaft inside an engine block.

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So this crankshaft will connect to the transmission,

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and when the engine is in drive, it will turn and pump the speaker cone up and down via a pushrod.

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Now to get the crank assembly into the car.

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This is kind of heavy.

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This heavy steel bar is going to anchor our crankshaft in the car.

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This is a simplest, rather crude, but simplest way of really making this thing solid.

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So I'm determined not to have this thing just rip itself apart.

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I want to have this speaker rip the car apart.

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It's time to find out if it works.

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I'm going to kick it into reverse.

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Hey! It's turning beautifully.

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Nice. That is nice.

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With the build progressing nicely, Adam and Jamie call in Tori for a little fact-finding myth show.

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This is beautiful. You're going to love this.

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Dude, I needed to go to Florida for us on the Subwoofer story.

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I needed to go down there and check out this contest we found.

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The winner of which is the one with the loudest car stereo.

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Okay, what do you want me to do there?

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Well, we need you to go there and see if any of these car stereo systems are actually capable of destroying the cars that they're installed in.

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Alright, cool.

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Should be a nice trip.

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So Tori's off to Daytona Beach, Florida for the Spring Break Nationals, the world's most famous sound off.

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Hey, look, I'm on TV.

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It's a tough job.

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This is nicer than my apartment.

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And Tori takes one for the team.

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But the Spring Break Nationals isn't just an excuse for the guys to show off the size of their equipment.

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They're here to compete.

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They come every year to sound off and find out exactly who has the loudest car audio system.

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Now you're the president of the DB Drag Racing.

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What is that?

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It's a format of car stereo competition where competitors compete against one another to see who has the loudest car stereo.

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Crazy but true, these guys customize their vehicles for one purpose, maximum volume.

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Then they compete in a head to head sound off, where the winner records the loudest decibel reading.

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But as Wayne heard about the myth, a car actually being destroyed by its stereo.

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Well, I haven't seen one detonate, if that's what you're saying, but I have seen windshields break.

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And I know of lots of vehicles where the panels have come undone.

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And I've seen lights that, you know, all of the driving lights on the top of the vehicle, like the trucks and stuff, pop out during competition.

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How many decibels would take to shatter a window?

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Well, there's not an exact answer, but I would say that once you get to 160 dB, you're in a range of sound pressure levels that could fracture the windshield.

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So 160 dB can potentially shatter a windshield.

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And Jamie and Adam have their benchmark.

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But let's get some more info on exactly what sound pressure can do.

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So I think we can actually name some figures to give viewers a perspective on the kinds of decibel levels we're talking about.

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140 dB is plenty to severely damage your ears no matter how short a time you're exposed to it.

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And 165 dB is what you get out of a jet airplane with 15,000 pounds of thrust.

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198 to 201 dB is enough to kill you from the shockwave alone.

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Yeah, and I believe 248 dB is what the atomic bombs that were dropped on Hiroshima and Nagasaki put out.

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Back with the bill team and they're tackling the myth that if you drive faster on a rough road, you get a smoother ride.

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We have three systems rigged to this car to tell us how bumpy the ride is.

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The first one is Tori suspension rig that's connected directly to the suspension on the wheel.

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As that deflects up and down, there's a needle that goes up and down and a camera on that so you can see what's going on.

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Perfect.

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The second system is Kerry's wine glass pyramid and that's filled with water and depending on how bumpy the ride is, we'll see water slosh out of the glasses.

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We know that there's a lot of water out of the glasses. That means that they had a really rough ride.

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Final system is my three axis accelerometer.

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Similarly, we have a three axis accelerometer.

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We have a three axis accelerometer.

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We have a three axis accelerometer.

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We have a three axis accelerometer.

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We have a three axis accelerometer.

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Final system is my three axis accelerometer.

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Similar to the one that was in Buster's head and that is going to measure electronically what the deflections are and I'll be able to load it on my computer and see.

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So it's official. This dirt road drive-by will result in more information than a space flight.

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And to check all systems are go, Grant and Tori are going to get the hump by taking on the parking lot speed bumps.

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Grant with full face helmet, five point safety belt and wet weather gear is focused on the safety issues, visibility and data accuracy.

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Tori, well he just wants to go faster.

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I hit it.

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Faster, faster.

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Yeah!

238
00:15:13,000 --> 00:15:14,000
Yeah!

239
00:15:16,000 --> 00:15:17,000
Yeah!

240
00:15:17,000 --> 00:15:18,000
Hit it.

241
00:15:19,000 --> 00:15:20,000
Yeah!

242
00:15:20,000 --> 00:15:21,000
Oh!

243
00:15:21,000 --> 00:15:22,000
Oh!

244
00:15:23,000 --> 00:15:24,000
Yeah!

245
00:15:25,000 --> 00:15:29,000
So everything's working and it's time to hit a rough road for real.

246
00:15:29,000 --> 00:15:35,000
With dirt tracks in short supply in San Francisco, they head out of town.

247
00:15:35,000 --> 00:15:38,000
Alright, here we are.

248
00:15:38,000 --> 00:15:41,000
Alright, we're here at the State Vehicle Recreation Center.

249
00:15:41,000 --> 00:15:47,000
This is where people with motorcycles, ATVs, rough road riding, this is the perfect spot to do it.

250
00:15:47,000 --> 00:15:57,000
The section that we've found here is an access road and it actually is pretty representative of a dirt road that you might find, say, out in the country or something like that.

251
00:15:58,000 --> 00:16:08,000
With their test track marked out, Grant gets into position for the first of two comparative runs. This one will be at the slower speed of 15 miles an hour.

252
00:16:08,000 --> 00:16:13,000
Okay, I'm good to go for run number one, 15 miles per hour. Over.

253
00:16:14,000 --> 00:16:16,000
Copy that.

254
00:16:18,000 --> 00:16:23,000
Grant eases up to the test speed.

255
00:16:23,000 --> 00:16:30,000
And the camera on the hood shows the axle gauge works perfectly. It's recording maximum deflections of three inches.

256
00:16:33,000 --> 00:16:36,000
Alright, Grant, so that was 15 miles an hour. It didn't look too crazy.

257
00:16:36,000 --> 00:16:41,000
No, and actually it was more like 20. Like, that car was idling very high.

258
00:16:41,000 --> 00:16:49,000
I'm noticing something. Your pants are wet now. Is that water? Why don't you come over and find out?

259
00:16:49,000 --> 00:16:59,000
While Tori finds out exactly how much water is lost from the glass pyramid, Grant, after a quick change of pants, downloads and saves the accelerometer data.

260
00:16:59,000 --> 00:17:01,000
Let's come back when they're done.

261
00:17:02,000 --> 00:17:04,000
Coming next, Tori gets an ear bashing.

262
00:17:05,000 --> 00:17:11,000
And Jamie and Adam fine tune their myth woofer installation plans.

263
00:17:11,000 --> 00:17:13,000
The diesel will make it fit.

264
00:17:22,000 --> 00:17:29,000
Back in Daytona Beach, Florida, and super sleuth Tori has got his ear to the ground at the Spring Break Nationals.

265
00:17:30,000 --> 00:17:36,000
Jamie and Adam have sent him on a crash course in auto audio for the myth shattering subwoofer.

266
00:17:36,000 --> 00:17:42,000
Can you destroy a car with a car stereo? If anyone can, it's one of these guys.

267
00:17:44,000 --> 00:17:50,000
Tori's next stop is Ayaska Champ Mike Bartels, the owner of one serious noise making machine.

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This is actually what's called an extreme vehicle. This vehicle is good for nothing but sound. Nothing but to be as loud as humanly possible.

269
00:17:59,000 --> 00:18:04,000
Put it this way, it's loud enough to make your hair stand on end.

270
00:18:04,000 --> 00:18:07,000
So what kind of modifications did you do to this?

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This thing is modified more than you can imagine. It actually weighs over 11,000 pounds, has over 50 bags of concrete in it, more fiberglass and steel than you can imagine.

272
00:18:16,000 --> 00:18:21,000
Windows is thick as four inches. It's just like a bank vault.

273
00:18:21,000 --> 00:18:25,000
Now are you doing that to keep the car from falling apart or is that just to keep the air pressure inside?

274
00:18:25,000 --> 00:18:31,000
It's a combination thing. The stronger you can make it to where no pressure can be released, the better it's going to be.

275
00:18:31,000 --> 00:18:37,000
So the louder it's going to be on the inside, you actually won't even hear that much on the outside, but inside it's just out of control.

276
00:18:37,000 --> 00:18:38,000
I'm going to take a look.

277
00:18:43,000 --> 00:18:47,000
Oh my God, that is ridiculous.

278
00:18:47,000 --> 00:18:54,000
The scary part about it is the way this design is, there's actually a 15 decibel difference from where you were at to the other side.

279
00:18:54,000 --> 00:19:02,000
So if I was on the other side, it's literally something we will not let somebody do because we don't know what will actually happen to your vital organs at 177 decibels.

280
00:19:02,000 --> 00:19:06,000
Oh, my liver. I think I might have damaged my liver.

281
00:19:06,000 --> 00:19:12,000
So Tari has learned 170 car stereo decibels is enough to tear stuff up.

282
00:19:12,000 --> 00:19:19,000
This subwoofer is so powerful, it takes a bolt this long to keep this door shut.

283
00:19:19,000 --> 00:19:26,000
But to find out if that sort of sound pressure will destroy an unmodified car, it's back to San Francisco.

284
00:19:26,000 --> 00:19:28,000
So how'd it go?

285
00:19:28,000 --> 00:19:35,000
It was very cool. It was a very cool contest and these cars are sick. The amount of deep ease they're getting up to is pretty incredible.

286
00:19:35,000 --> 00:19:40,000
So did you see anything on the level of car level destruction with those kind of decibel levels?

287
00:19:40,000 --> 00:19:46,000
Not like the myth talks about. I mean there was a lot of rattling, but no panels were popping off, windshields were not cracking.

288
00:19:46,000 --> 00:19:52,000
In fact, they actually build the car strong so that they don't break because they want to compress all that air.

289
00:19:52,000 --> 00:19:56,000
They want to keep that air pressure so they can have higher DVs.

290
00:19:56,000 --> 00:20:01,000
So car level destruction by decibels is a complete myth theory.

291
00:20:01,000 --> 00:20:09,000
Even in the world of sound off competition where the specialists use resonance to enhance their incredibly high volume readings.

292
00:20:10,000 --> 00:20:17,000
But of course, Jamie and Adam will go their own way. They'll be attempting to blow the car up with DVs alone.

293
00:20:17,000 --> 00:20:24,000
Raw, unadulterated volume. The plan is to power their giant speaker with the diesel engine of the car.

294
00:20:24,000 --> 00:20:33,000
The driveshaft will pump the speaker cone up and down, creating waves of sound pressure intense enough to destroy this unfortunate vehicle.

295
00:20:33,000 --> 00:20:40,000
This is the cone for the speaker. Now technically we could just have a flat plate, but this will actually be stronger.

296
00:20:40,000 --> 00:20:44,000
It'll be less likely to bend when we start pumping up and down on it.

297
00:20:44,000 --> 00:20:56,000
And you know, in a real speaker you would have like something that was perfectly conical, but by making these pie sections we're able to get pretty close with a lot less work.

298
00:20:56,000 --> 00:21:05,000
Wow, that is perfect.

299
00:21:05,000 --> 00:21:16,000
Next, an attractor inner tube will double up as the speaker surround. This flexible diaphragm will allow the speaker cone to vibrate and retain a seal on the speaker cavity.

300
00:21:16,000 --> 00:21:28,000
And once it's glued to the aluminum cone, Adam and Jamie work on a new Mythbuster theme tune.

301
00:21:28,000 --> 00:21:33,000
We are actually really close to nearing completion on all the major components of the subwoofer.

302
00:21:33,000 --> 00:21:42,000
All that remains for us is to put in the wooden parts that will house the speaker cone, glue the rubber gasket to those, bolt it all together.

303
00:21:42,000 --> 00:21:49,000
And I can't think of anything else, so that must mean that we're close to a test.

304
00:21:49,000 --> 00:21:55,000
With most of the box cut and glued into place, it's time to attach the push rod to the crankshaft.

305
00:21:55,000 --> 00:22:02,000
This is the crucial link that will transfer the power of the engine to the speaker cone.

306
00:22:02,000 --> 00:22:07,000
And speaking of the cone, here it comes. But, will it fit?

307
00:22:07,000 --> 00:22:17,000
Look at that. Dude, that's plenty of clearance. I was all worried.

308
00:22:17,000 --> 00:22:23,000
To make sure the speaker cone stays attached to the push rod, Jamie bolts it into place.

309
00:22:23,000 --> 00:22:25,000
And there we go.

310
00:22:25,000 --> 00:22:34,000
Now the thing is to paint on the contact cement. This provides the main attachment between the speaker diaphragm and the body of the car.

311
00:22:34,000 --> 00:22:42,000
A coat of stinky, sticky stuff and some loving attention with a rubber mallet and the monster myth woofer comes to life.

312
00:22:42,000 --> 00:22:46,000
And Dr. Jamie Frankenstein is as happy as can be.

313
00:22:46,000 --> 00:22:58,000
That's not half bad. It's a little off, but I think it'll sort of seat as we kind of turn on the diesel. The diesel will make it fit.

314
00:22:58,000 --> 00:23:04,000
Next on MythBusters, Grant prepares to fast track the rough road myth.

315
00:23:04,000 --> 00:23:11,000
Ready for your 45 mile an hour run. Paramedics are nowhere to be found.

316
00:23:11,000 --> 00:23:14,000
Remember, don't try this at home.

317
00:23:14,000 --> 00:23:22,000
We've got years of experience that keeps us safe.

318
00:23:22,000 --> 00:23:29,000
Back on the bumpy road and Grant and Tori are collecting data in an attempt to solve the riddle of the rough road.

319
00:23:29,000 --> 00:23:37,000
For answers, our drive by duo are going to compare the vibrations at 20 and 45 miles an hour.

320
00:23:37,000 --> 00:23:43,000
Alright, so we just did one run with Grant going 20 miles an hour. There wasn't a lot of movement between the axle and the vehicle.

321
00:23:43,000 --> 00:23:53,000
The maximum deflection on the suspension gauge was 3 inches and there were 3.5 liters of water lost from Kerry's glass pyramid.

322
00:23:53,000 --> 00:23:59,000
With the pyramid refilled, it's time this experiment moved into top gear.

323
00:23:59,000 --> 00:24:06,000
Okay, Grant, ready for your 45 mile an hour run. Paramedics are nowhere to be found.

324
00:24:06,000 --> 00:24:08,000
Might be the last time we see Grant.

325
00:24:08,000 --> 00:24:15,000
With his elaborate safety measures, Grant has been driving Tori crazy. But this run is no driving this daisy.

326
00:24:15,000 --> 00:24:17,000
Look at that water.

327
00:24:17,000 --> 00:24:23,000
At 45 miles an hour on a tricky dirt trail, this is the real deal.

328
00:24:23,000 --> 00:24:31,000
The axle gauge is showing a lot more activity, at times reaching the top of the scale, a maximum deflection of 6 inches.

329
00:24:31,000 --> 00:24:34,000
Don't hit that rock. Yeah!

330
00:24:34,000 --> 00:24:39,000
But let's find out from the driver whether the faster speed led to a smoother ride.

331
00:24:39,000 --> 00:24:44,000
Dude, your eyes are wide open. Did it scare you a little bit?

332
00:24:44,000 --> 00:24:51,000
Yeah, other than kind of control problems, it's actually a lot smoother than I thought it would be.

333
00:24:51,000 --> 00:24:54,000
I thought I'd be all over the place.

334
00:24:54,000 --> 00:25:03,000
What is all over the place is the water from the glass pyramid. 4.5 liters were lost, one full liter more than the slower test.

335
00:25:03,000 --> 00:25:12,000
Which means Grant's subjective experience in the car of a smooth ride is at odds with the data. But Tori has a theory.

336
00:25:12,000 --> 00:25:18,000
It might be similar to, like say, a horse, as opposed to a trot and a gallop.

337
00:25:18,000 --> 00:25:27,000
Maybe the slower you're going, you're more conscious of the actual hits that you're doing, the rocks, the bumps. You're conscious of that.

338
00:25:27,000 --> 00:25:34,000
Which might sound like a load of old horse manure, but Tori is prepared to saddle up to prove his point.

339
00:25:34,000 --> 00:25:41,000
Okay, so I'm giving you these and I'm going to expect you to act responsibly, be home by 11 and have it gassed up.

340
00:25:41,000 --> 00:25:43,000
Alright, Mom.

341
00:25:43,000 --> 00:25:47,000
Act responsibly? Tori Belachie? It's possible.

342
00:25:47,000 --> 00:25:54,000
After seeing Grant do that 40-mile-an-hour run, it just makes me want to get in there and go 70.

343
00:25:54,000 --> 00:25:59,000
With the area clear and the team at a safe distance, Tori hits the gas.

344
00:25:59,000 --> 00:26:08,000
Responsible drivers, those wearing pacemakers, and Tori's insurance company may find the following pictures disturbing.

345
00:26:15,000 --> 00:26:19,000
Yeah, he's looking a little squirrely, just like I was.

346
00:26:19,000 --> 00:26:24,000
Incredibly, he makes it back in one piece, but what exactly was his speed?

347
00:26:27,000 --> 00:26:36,000
I guess around the first set of bumps, I probably hit around 70, and by the time I passed the high-speed camera, I was close to 75.

348
00:26:36,000 --> 00:26:42,000
Man, well, yeah, let's see what the data says.

349
00:26:42,000 --> 00:26:51,000
And for that, it's back to the shop, where Adam and Jamie lend Grant their massive brains in an attempt to decipher the data.

350
00:26:51,000 --> 00:27:03,000
The numbers from the glass pyramid and suspension gauge quite clearly showed that the faster you go, the bumpier the ride, leaving the myth on a road to nowhere.

351
00:27:03,000 --> 00:27:06,000
Now, finally, I have my accelerometer data.

352
00:27:06,000 --> 00:27:12,000
But the accelerometer data on this comparative graph says just the opposite.

353
00:27:12,000 --> 00:27:19,000
The dark line of the 20-mile-an-hour test shows more G-Force peaks, representing a bumpier ride.

354
00:27:21,000 --> 00:27:30,000
Yeah, the 70 miles an hour, the first, like, 70% of the test seems to be smoother than the 15 miles an hour, but again, like the 45, the spikes are higher.

355
00:27:30,000 --> 00:27:38,000
Well, our data is in a little bit of conflict here. I mean, clearly, as you go faster, you lose more water and you have more deflection on the suspension.

356
00:27:38,000 --> 00:27:50,000
But our accelerometer says during that part where, you know, the road is fairly uniform, you actually have a better smoother ride when you're driving faster.

357
00:27:50,000 --> 00:27:58,000
So what we're saying here is that the myth is plausible. But I really don't think that we can put this one to bed unless we test the washboard road.

358
00:27:58,000 --> 00:28:08,000
But that is the type of road surface that people think about and have experienced that driving faster makes for a smoother ride, and I think you should try it and get the data to support that.

359
00:28:08,000 --> 00:28:19,000
So it's back to the drawing board. If the team want to nail this myth, maybe they have to build a replica of a track the tale is based on, the washboard road.

360
00:28:19,000 --> 00:28:27,000
These corrugated dirt tracks are common in the Australian Outback, and Grant takes time out to discover how they're formed.

361
00:28:27,000 --> 00:28:37,000
So it turns out washboarding is created by the response of your car suspension to alternatively accelerating or braking or hitting a pothole.

362
00:28:37,000 --> 00:28:46,000
What that does is it sets up an oscillation in the suspension that alternatively compacts the dirt or makes it fly up, creating that pattern.

363
00:28:46,000 --> 00:28:50,000
After the break, Adam shows off his massive myth woofer.

364
00:28:50,000 --> 00:28:52,000
Holy cow, how big is that?

365
00:28:52,000 --> 00:28:56,000
And the rough road to success sends the build team round the bend.

366
00:28:56,000 --> 00:28:58,000
I have come to take over the world.

367
00:29:10,000 --> 00:29:14,000
Adam and Jamie have souped up their ride with one thing in mind.

368
00:29:14,000 --> 00:29:23,000
Here we have the original factory installation, and here we have the custom, more deluxe, a little over the top installation.

369
00:29:23,000 --> 00:29:35,000
They're testing the myth that you can do this with a car stereo, and their diesel powered speaker is just about ready to fire up.

370
00:29:35,000 --> 00:29:39,000
Now we just have to decide what tune we're going to play.

371
00:29:39,000 --> 00:29:48,000
DJ Jamie may be thinking about breaking out his hip hop collection, but the sounds this speaker will generate won't be music to anyone's ears.

372
00:29:48,000 --> 00:29:58,000
We will not be piping a sound into this speaker, but it will be making a sound. Let me explain.

373
00:29:58,000 --> 00:30:06,000
We are merely creating a set of pressure waves, specifically just using the car's engine to make this thing go up and down about 15 to 20 times per second.

374
00:30:06,000 --> 00:30:12,000
That is sound, because all sound is, is a set of oscillating pressure waves.

375
00:30:12,000 --> 00:30:24,000
It's probably going to be too low to actually hear anything, because humans can't hear really subsonic sounds, like under 20, 25 hertz, or 20 to 25 vibrations per second.

376
00:30:24,000 --> 00:30:31,000
But it will be incredibly high in the decibel range, and decibels is only a measure of pressure.

377
00:30:31,000 --> 00:30:37,000
So that's it. Adam and Jamie's diesel powered subwoofer is all set to sound off.

378
00:30:37,000 --> 00:30:47,000
And fresh from the DV drag race in Daytona, our Duke of decibels, Wayne Harris, is here to help measure the myth woofer's subsonic output.

379
00:30:47,000 --> 00:30:50,000
Check it out.

380
00:30:50,000 --> 00:30:58,000
It's like the world's largest walk. Holy cow, how big is that?

381
00:30:58,000 --> 00:31:00,000
Good question. How big is it?

382
00:31:00,000 --> 00:31:03,000
It is, it's 51 inches in diameter.

383
00:31:03,000 --> 00:31:08,000
Judging by that stunned expression, Wayne has never seen one as big as Adam's.

384
00:31:08,000 --> 00:31:14,000
Yeah, it's very, I mean, go big or stay home. I'm not a...

385
00:31:14,000 --> 00:31:17,000
I don't know if there's much more speaker that could be fit in here.

386
00:31:17,000 --> 00:31:19,000
No, I don't think so.

387
00:31:19,000 --> 00:31:25,000
And after a guided tour of the speaker specs, Wayne is still wearing that bemused look.

388
00:31:25,000 --> 00:31:27,000
I was thinking, you know, you're going to hook it up to the engine.

389
00:31:27,000 --> 00:31:29,000
I didn't realize you were going to use the transmission.

390
00:31:29,000 --> 00:31:34,000
So you got some serious torque. I don't even know how to convert that into equivalent power.

391
00:31:34,000 --> 00:31:40,000
So it's time to raise the curtain on this tall tail of the shattering subwoofer.

392
00:31:40,000 --> 00:31:46,000
Adam tapes off a safety zone, and the myth woofer is ready to roll.

393
00:31:46,000 --> 00:31:48,000
Go.

394
00:31:48,000 --> 00:31:51,000
Wayne prepares his measuring equipment.

395
00:31:51,000 --> 00:31:58,000
The setup is simple. A precision sound pressure level sensor will sit on the windshield inside the car.

396
00:31:58,000 --> 00:32:02,000
And Wayne will get a decibel reading on his laptop at a safe distance.

397
00:32:02,000 --> 00:32:04,000
All right. High speed ready?

398
00:32:04,000 --> 00:32:05,000
Ready.

399
00:32:05,000 --> 00:32:08,000
Well, it's almost time to fire this thing off.

400
00:32:08,000 --> 00:32:11,000
And potentially blow up this car.

401
00:32:11,000 --> 00:32:16,000
But first, I'd like to do one quick test run just to make sure it's operational.

402
00:32:16,000 --> 00:32:19,000
Open all the doors so we don't build up any pressure.

403
00:32:19,000 --> 00:32:23,000
Turn on the engine, make a test of pulling the car into gear,

404
00:32:23,000 --> 00:32:26,000
and test of pulling the throttle just a little bit.

405
00:32:27,000 --> 00:32:30,000
The myth woofer has yet to be tried.

406
00:32:30,000 --> 00:32:35,000
The aim of this preliminary test is simply to check the massive speaker is working.

407
00:32:35,000 --> 00:32:40,000
You know what will make this test a success is the rig itself not failing.

408
00:32:40,000 --> 00:32:43,000
My big concern is that the subwoofer is not going to hold together.

409
00:32:43,000 --> 00:32:49,000
There's going to be tremendous forces at play on the linkage between the engine and the cone of the woofer.

410
00:32:49,000 --> 00:32:54,000
And if the cone starts to fluctuate, it could literally rip itself apart.

411
00:32:54,000 --> 00:32:55,000
You ready, Wayne?

412
00:32:55,000 --> 00:32:56,000
Ready.

413
00:32:56,000 --> 00:32:57,000
Okay.

414
00:33:01,000 --> 00:33:02,000
Stop.

415
00:33:06,000 --> 00:33:07,000
That looks like it worked.

416
00:33:08,000 --> 00:33:14,000
Like a dream, Adam pulled the throttle, the driveshaft spun the crank, which pumped the pushrod,

417
00:33:14,000 --> 00:33:18,000
and that in turn pumped the speaker cone through several cycles.

418
00:33:19,000 --> 00:33:22,000
Dude, I'm cautiously optimistic.

419
00:33:22,000 --> 00:33:25,000
That's exactly what we wanted to see.

420
00:33:25,000 --> 00:33:29,000
We wanted to see it go without any big ka-plang and things shooting off.

421
00:33:29,000 --> 00:33:31,000
So we know the rig works.

422
00:33:31,000 --> 00:33:34,000
Now it's time to close the door and do it under pressure.

423
00:33:38,000 --> 00:33:45,000
So far, it's Rough Road Myth 1, Carrie Grant and Tori Zip.

424
00:33:45,000 --> 00:33:50,000
To even the score, the team have de-camped to the wide open asphalt of Alameda.

425
00:33:50,000 --> 00:33:54,000
The dirt road data they've gathered so far is a little confusing.

426
00:33:54,000 --> 00:34:01,000
The pyramid and the suspension gauge seem to indicate a faster ride is a bumpier ride.

427
00:34:01,000 --> 00:34:02,000
Wow!

428
00:34:03,000 --> 00:34:07,000
But Grant's accelerometer hinted at the opposite.

429
00:34:07,000 --> 00:34:13,000
To solve the problem, our intrepid trio have decided to build a washboard road of their own.

430
00:34:13,000 --> 00:34:15,000
So, Carrie, what's the plan?

431
00:34:15,000 --> 00:34:19,000
The plan today is going to be a little back-breaking.

432
00:34:19,000 --> 00:34:27,000
We have about 4,000 pounds of steel angle iron that we are going to lay with about 8-inch increments

433
00:34:27,000 --> 00:34:31,000
and weld them all down to make one long track.

434
00:34:31,000 --> 00:34:33,000
It's going to be belongs out here.

435
00:34:34,000 --> 00:34:38,000
It doesn't look that tough, especially if you edit the sequence like this.

436
00:34:41,000 --> 00:34:46,000
Voila! One easy to assemble, straight out of the box, washboard road.

437
00:34:46,000 --> 00:34:48,000
Grant's going to tell us more about it.

438
00:34:48,000 --> 00:34:54,000
We've taken this angle iron and welded it to the steel here, creating a washboard pattern.

439
00:34:54,000 --> 00:35:01,000
And our research indicates that 4 inches tall and about 8 inches apart is about as bad as washboarding can get.

440
00:35:03,000 --> 00:35:10,000
So this steel track is an exact replica of the corrugated roads in Australia where the myth comes from.

441
00:35:10,000 --> 00:35:14,000
Which means when Tari's finished his siesta, there's just one thing left to do.

442
00:35:14,000 --> 00:35:20,000
The test is going to be, we're just going to drive over our strip of washboard at different speeds.

443
00:35:20,000 --> 00:35:25,000
Probably start around 10 miles an hour and then slowly ramp up to 70 miles an hour.

444
00:35:25,000 --> 00:35:30,000
For these runs, the team are just using the glass pyramid and the accelerometer.

445
00:35:30,000 --> 00:35:33,000
5 miles an hour and he's still wearing his helmet.

446
00:35:35,000 --> 00:35:38,000
And Grant is all set for the first run.

447
00:35:38,000 --> 00:35:40,000
NASCAR, it ain't.

448
00:35:40,000 --> 00:35:45,000
Cruising at a breakneck 5 miles an hour, he hits the test track.

449
00:35:46,000 --> 00:35:51,000
But surprisingly, Grant and the glass pyramid are really feeling the vibe.

450
00:35:51,000 --> 00:35:53,000
Oh, look at the glasses spilling.

451
00:35:53,000 --> 00:35:55,000
Interesting.

452
00:35:55,000 --> 00:35:56,000
That's pretty bumpy.

453
00:35:56,000 --> 00:35:57,000
I saw that.

454
00:35:57,000 --> 00:36:00,000
You could see all the water jumping out of the glass.

455
00:36:00,000 --> 00:36:05,000
The glass pyramid showed a lot of activity, but the high speed is inconclusive.

456
00:36:05,000 --> 00:36:10,000
The wheel is bouncing, but how much? We won't know until we see a comparison.

457
00:36:11,000 --> 00:36:13,000
Time for run number two.

458
00:36:13,000 --> 00:36:16,000
Grant has to keep the speed at a steady 40 miles an hour.

459
00:36:18,000 --> 00:36:23,000
Tori and Carrie are charged with the responsibility of timing the run.

460
00:36:23,000 --> 00:36:24,000
Did you time it?

461
00:36:24,000 --> 00:36:26,000
I did it when 1000 rach!

462
00:36:26,000 --> 00:36:32,000
Okay, so the timing thing didn't work out, but the high speed camera is very interesting.

463
00:36:32,000 --> 00:36:37,000
Compared to the slow run, the wheels are skimming across the tops of the bumps.

464
00:36:38,000 --> 00:36:41,000
Just by feeling it, it fell a lot smoother.

465
00:36:41,000 --> 00:36:42,000
Really?

466
00:36:42,000 --> 00:36:44,000
I don't know what the data is going to say, but just...

467
00:36:44,000 --> 00:36:46,000
Okay, let's count up our water.

468
00:36:46,000 --> 00:36:50,000
But there's some head scratching, because the numbers just don't add up.

469
00:36:50,000 --> 00:36:52,000
You ready for the countdown?

470
00:36:52,000 --> 00:36:53,000
Yep.

471
00:36:53,000 --> 00:36:58,000
Although Grant experienced a smoother ride, there was more water lost than the slower run.

472
00:36:58,000 --> 00:36:59,000
Tear.

473
00:36:59,000 --> 00:37:01,000
Yeah, those two there. Looks like you've lost two.

474
00:37:01,000 --> 00:37:06,000
Which means the physical data contradicts Grant's subjective experience in the car.

475
00:37:08,000 --> 00:37:13,000
Tori and Grant respond to this clip and the proceedings in their own special way.

476
00:37:13,000 --> 00:37:14,000
You'll never defeat me!

477
00:37:14,000 --> 00:37:16,000
I have come to take over the world!

478
00:37:19,000 --> 00:37:22,000
And with that done, it's time for the final run.

479
00:37:22,000 --> 00:37:26,000
And Grant feels the need, the need for speed.

480
00:37:26,000 --> 00:37:29,000
This run is going to hit 70 miles an hour.

481
00:37:29,000 --> 00:37:33,000
So, if you start steering in towards us, let's just run.

482
00:37:37,000 --> 00:37:40,000
Grant and the Cutlass fly over the track.

483
00:37:40,000 --> 00:37:46,000
The high-speed camera again confirms the tires skip across the peaks of the corrugations,

484
00:37:46,000 --> 00:37:48,000
exactly as the myth suggests.

485
00:37:48,000 --> 00:37:51,000
It's built actually pretty smooth.

486
00:37:51,000 --> 00:37:52,000
Yeah, it looked really smooth.

487
00:37:52,000 --> 00:37:55,000
I mean, subjectively, very smooth.

488
00:37:55,000 --> 00:37:56,000
From the glasses, it's looking really good.

489
00:37:56,000 --> 00:37:58,000
It looks like there's a lot less spillage this time.

490
00:37:58,000 --> 00:38:04,000
This time, the water lost from the pyramid backs up both Grant's experience and the high-speed results.

491
00:38:04,000 --> 00:38:07,000
No quarter. That's it.

492
00:38:07,000 --> 00:38:08,000
That's it.

493
00:38:08,000 --> 00:38:09,000
That's it.

494
00:38:09,000 --> 00:38:11,000
So, it's looking good for myth confirmed.

495
00:38:11,000 --> 00:38:15,000
And Tori celebrates with a few skid marks.

496
00:38:15,000 --> 00:38:18,000
Well, Jamie, we went ahead and built our artificial washboard.

497
00:38:18,000 --> 00:38:24,000
I think we can conclusively say driving faster on a rough road will give you a smoother ride.

498
00:38:24,000 --> 00:38:28,000
Still, you know, you're driving 70 miles an hour and you hit a pothole,

499
00:38:28,000 --> 00:38:31,000
you're going to break your suspension with that kind of mass and velocity.

500
00:38:31,000 --> 00:38:32,000
What's the verdict?

501
00:38:32,000 --> 00:38:35,000
Well, as far as the myth goes, it's confirmed.

502
00:38:35,000 --> 00:38:36,000
Confirmed?

503
00:38:36,000 --> 00:38:37,000
Confirmed.

504
00:38:37,000 --> 00:38:38,000
Cool.

505
00:38:55,000 --> 00:39:04,000
Adam and Jamie have successfully tested the world's first diesel-powered speaker.

506
00:39:04,000 --> 00:39:11,000
The question now is how to maximize the rig's potential for the real experiment.

507
00:39:11,000 --> 00:39:16,000
Do we bring it up to a certain speed and just run until it buzzes, or do we try and like...

508
00:39:16,000 --> 00:39:21,000
Like that. I just... I want to crank it and just send it to the moon.

509
00:39:21,000 --> 00:39:25,000
Adam's solution has got myth busters stamped all over it.

510
00:39:25,000 --> 00:39:26,000
Let's do it.

511
00:39:26,000 --> 00:39:29,000
Excess. And lots of it.

512
00:39:29,000 --> 00:39:35,000
Adam fires up the engine and Wayne gets into position at the recording station.

513
00:39:35,000 --> 00:39:44,000
In order for this myth to be true, we need to see this car destroyed in some fashion by the sound system,

514
00:39:44,000 --> 00:39:46,000
i.e. our big speaker.

515
00:39:46,000 --> 00:39:48,000
Anything else in this thing is pretty much busted.

516
00:39:48,000 --> 00:39:54,000
Of course, Adam and Jamie are impartial scientists, so a result either way is valid.

517
00:39:54,000 --> 00:39:57,000
But let's face it, music to their ears...

518
00:39:57,000 --> 00:40:01,000
We've got three melodies. It's called first gear, second gear, and third gear.

519
00:40:01,000 --> 00:40:03,000
...will be the sound of shattering car.

520
00:40:03,000 --> 00:40:04,000
Ready. Let's go for it.

521
00:40:04,000 --> 00:40:07,000
In three, two, one.

522
00:40:07,000 --> 00:40:22,000
Now that didn't go to plan. The car is very unexploded.

523
00:40:22,000 --> 00:40:27,000
I'm thinking the audio guy better get ready with the bleep machine.

524
00:40:27,000 --> 00:40:29,000
There you go.

525
00:40:29,000 --> 00:40:34,000
I don't see no cracked glass.

526
00:40:35,000 --> 00:40:39,000
And why not? Because the speaker sure did look like it was working.

527
00:40:39,000 --> 00:40:43,000
And if it was, it was pumping out some serious sound pressure.

528
00:40:43,000 --> 00:40:47,000
It actually, to me, looked like a piece of medical hardware when it was pumped.

529
00:40:47,000 --> 00:40:49,000
It looked like some kind of...

530
00:40:49,000 --> 00:40:56,000
I mean, it was so kind of barbarically primitive in the way it was moving.

531
00:40:56,000 --> 00:41:03,000
And yet, I was so gratefully pleased to see that it was moving exactly as we intended it to move.

532
00:41:05,000 --> 00:41:09,000
Check this out. Blew the sunroof completely out of its tracks.

533
00:41:09,000 --> 00:41:11,000
Oh, no!

534
00:41:11,000 --> 00:41:14,000
Well, that's probably the reason the windows didn't go hot.

535
00:41:14,000 --> 00:41:18,000
Yeah, once you have any type of opening, you know, all the pressure inside is released.

536
00:41:18,000 --> 00:41:21,000
The reason that we didn't get an explosion or shattered glasses,

537
00:41:21,000 --> 00:41:24,000
because when you put pressure in a car like this,

538
00:41:24,000 --> 00:41:28,000
that pressure is going to find the first outlet it can and release itself.

539
00:41:28,000 --> 00:41:33,000
In this case, it popped the sunroof off of its tracks itself, not a small feat.

540
00:41:33,000 --> 00:41:36,000
And at that point, nothing else was going to fail,

541
00:41:36,000 --> 00:41:41,000
because the air had plenty of room to move around then by escaping from the car.

542
00:41:41,000 --> 00:41:46,000
Okay, so the sound pressure escaped into the wild blue yonder via the sunroof,

543
00:41:46,000 --> 00:41:50,000
leaving the windows and the rest of the car intact.

544
00:41:50,000 --> 00:41:56,000
But how many decibels did the myth woofer pump out before it broke down?

545
00:41:56,000 --> 00:42:00,000
It did a 161.3 when it failed,

546
00:42:00,000 --> 00:42:04,000
but what really impresses is it did it at 16 hertz.

547
00:42:04,000 --> 00:42:09,000
That is just almost unheard of to produce sound pressure levels that high at such low frequencies.

548
00:42:09,000 --> 00:42:12,000
It just takes a tremendous amount of energy to do that.

549
00:42:12,000 --> 00:42:16,000
Remember, a jet engine with 15,000 pounds of thrust

550
00:42:16,000 --> 00:42:20,000
generates 165 decibels of sound pressure.

551
00:42:20,000 --> 00:42:24,000
Wow, it's just an incredible amount of force.

552
00:42:24,000 --> 00:42:27,000
With the myth woofer pumping out that kind of sound energy,

553
00:42:27,000 --> 00:42:29,000
and the car still not detonating,

554
00:42:29,000 --> 00:42:31,000
now there's the failure.

555
00:42:31,000 --> 00:42:35,000
This myth is looking as busted as, well, the myth woofer.

556
00:42:35,000 --> 00:42:39,000
Wow, it's a violent thing. It's a heck of a tune.

557
00:42:39,000 --> 00:42:41,000
Did someone ask for a tune?

558
00:42:41,000 --> 00:42:44,000
The fat lady is warming up right now.

559
00:42:44,000 --> 00:42:48,000
Well, guys, what are we going to call this? Busted, plausible, or confirmed?

560
00:42:48,000 --> 00:42:50,000
That's busted, without a doubt.

561
00:42:50,000 --> 00:42:53,000
Look, we created some ludicrously high decibel levels,

562
00:42:53,000 --> 00:42:56,000
and the pressure did exactly what it'll do on any car.

563
00:42:56,000 --> 00:42:59,000
It found one outlet, popped out through there,

564
00:42:59,000 --> 00:43:01,000
and stopped acting on the rest of the car.

565
00:43:01,000 --> 00:43:05,000
I'm not saying you can't smash glass with sound.

566
00:43:05,000 --> 00:43:09,000
I mean, I think that's entirely possible, but you cannot destroy a car.

567
00:43:09,000 --> 00:43:13,000
Face it, this speaker's so big you can't get in the car,

568
00:43:13,000 --> 00:43:18,000
so it's ridiculously oversized, and it's powered by the diesel.

569
00:43:18,000 --> 00:43:24,000
If that doesn't do it, then any kind of regular conventional speaker isn't going to do it,

570
00:43:24,000 --> 00:43:26,000
even a really, really big one.

571
00:43:26,000 --> 00:43:28,000
No, it's totally busted.