Holy @#$%!
 

Something that I thought only happened in cartoons occured to me today, and it was incredibly frightening.

I have a custom probably similar to something some of you people do- when I get a new CD, I pull up in my driveway and just listen to it with my eyes closed, and generally louder than I would normally listen to it. Well, I took out the CD that was in my player to put in the new one, and played it rather loud. I put the other CD on my passenger front seat. THe song playing was the first movement of Schubert's Symphony No.2. It gets to an extremely high point at the middle of it when suddenly CRACK the CD lying on the passenger seat splits in two.

Probably the first time I have used the F word this year.:confused: :o

THis was also the first time I have observed "resonence" actually breaking an object- has anyone else seen this?

Wow. What a mind trip.

'Tis fuckin cool.

And of course wouldn't you know it, I never converted the other CD to MP3s... goddamnit...

I've seen a car with four 15" subs pop the back windscreen out...but not high frequencies.

hahah.....ever seen one of the gangsta cars in NYC shatter the windscreen playing Nelly??
:D :up:

Have you ever seen one pop out the back and into another car?:D

Must be that new kind of copy protection I'm hearing about.

UJ

Oh I just got an Idea, tommorrow I'm going to blast the symphony on a boom box right next to my brothers CD collection and see if I can repeat the experiment .... http://smilies.networkessence.net/contrib/ed/idea.gif

i did this for an science project once

if a sound hits just the right frequency/magnitude for a certian material, it can shatter it like nothing. plastic, glass, steel, diamond, it doesn't matter.

by the way, it's called harmonic disturbance.


and atmo, thats just fluctuating air pressure. you need to open a window to keep it from doing that.

I doubt your boom-box (unless high quality) possesses the ability to reproduce the resonant frequency of the CD-discs at a sufficient volume to cause them to break...you need a fairly decent system for that, or a dedicated tone-generator.

If your IDIOT BROTHER! likes to play with your Klipsch speakers so much, set them up in his room, and crank them up :-D

Even better... set them in his room at about ohhh .... 3 am, when he's alseep and just turn the volume up. Although you wake up your parents and such, you can easily disrupt not only his CD collection but a good nights worth of sleep, and he'll never get the great sounds of classical music out of his head.

Bye bye Linkin Park!:D

Muahahahaha!

Yeh, Some guy put an air pressure guage inside his car at the melbourne auto salon a few years back to see just how much pressure the stereo could generate...

It was about 0.5 psi positive, then 0.5 negative...Doesnt sound like much, but when you consider that a windscreen is approximately 1000 square inches, thats 500 pounds of possitive then negative pressure on it fluctuating at 30-70 cyles per second!!

No wonder they strap their windows down, or replace them with really thick perspex.

holy fuckin shit, i'd love to break stuff using music!

I thought it would take sounds at a frequency of more than 20,000Hz (i.e. beyond our range of hearing) to break even glass, let alone the slightly flexible plastic of a CD.

but you het frequencies up to 44,000Hz on a cd. (actually i think it's 44,441Hz, but i am not sure), so it might just be possible.

anyone want to break into my physics lab with me, so we can test this? :cool: could be fun :D and i get on quite well with my physics teacher, so i'm sure he won't mind too much...

I'm thinking it has something to do with a coincidence of tone and acoustics of my car and the location of the CD... because no other CD has since cracked upon playing it.

I can't ignore the fact that A CD just cracked in half for no reason, that just doesn't happen.

Not quite...the SAMPLE RATE of a standard audio CD in indeed 44.1 KHz, however, the maximum frequency which can be produced from any data is equal to 1/2 it's sample rate, so an audio CD, although having a sample rate of 44.1 KHz can only reproduce sound up to 22.05 KHz.

I could be wrong, but I don't think acoustic resonance generally causes things to crack neatly in half...I'd expect that a harmonic resonation in an object such as a CD would cause it to shatter into multiple asymettrical peices rather than cleaving neatly down the center. Perhaps it broke for a different reason?

That sounds about right, but will your speakers actually play those frequencies that are recorded? Probably not. I think most speakers do about 20hz-20,000hz.

Yeah Xerxes, you probably had to have just the right circumstances for that to happen, wow! Was the sun shining on it? Maybe it was a little hot or something. Or cold? :weird: :igor:

Could be that there was a slight manufacturing defect in the original disc, which made it more succeptible to spontaneous cracking, and also the splitting in half as opposed to any more even sort of pattern.

I think he's just going so mad, "The Sixth Sence" is coming to real life. ;) :p

it depends on the grain of the material.

plastic usually has a grain similar to that of wood, it its possible ot have a neat break right down the middle, as for glass, that has pretty much no grain so it shatters, same with most metals.

Just want to point out that you can break things without going into impossibly high frequencies. The resonance frequency of some materials can be as low as 100Hz, it really all depends. Resonance frequencies are extremely exact though (100.02929920011678Hz, for example), so it's rare to reproduce them randomly.

Not that it really matters whether the window is open or closed for this, but I bet your neighbors are really going to appreciate that! (Like I said, not that it would really make much difference how much your neighbors would hear)...that's pretty funny.

This reminds me of something I saw on the way to school. It was pretty cold this morning, so all the cars were putting out steam from the condensation. Anyway, each time a car went by, the fog would quickly go up & then go down (in a very short period of time). :D You'd have to see it to know how funny it looked!

I just wonder if this is what Limp Bizkit meant by Break Stuff?

hmm


i just found out i can break cd's with a moog.

http://www.rockprojekt.de/Keyboards/...dular-moog.jpg

you try it.

probably could be done with a theremin too

Xerxes - PICTURES! /me begs

I wanna see this :D (please tell me you kept the thing)

Rofl, good going sexreX...I'll try that sometime with something loud and annoying.

I wonder what other things that sound can do?

sound exceding 200 dB can bore through solid material, and can kill you.

Speach is ~60 dB. your average rock concert is ~110 dB. Threashold of pain is ~130 dB, your eardrum will instantly bust at ~160 dB.

Sound is a VERY powerfull tool if used right.

wow... I really didn't know that. And that's very interesting... I guess Sound and water (being that water can cut through diamons) are really the worlds most powerful weapons.

water cant cut through adamant sound can shatter it though

Found this on the soundstream website.

What is DB?:igor: I hear it all the time but never bothered.

yep, if a beat hits just right with a heart beat it will stop your heart.

Decibel. A unit for measuring sound intensity. Goes on a logarithmic scale, so 10db is 100 times louder then 1db.

Is it possible for a subwoofer in a theatre to explode while watching a movie?

http://www.jetnoise.org/REal2.htm

Worth a read.