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Old 4th March 2012, 11:49 PM   #11
m4ick is offline m4ick  United States
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I think it has more to do with the vehicle itself. We did higher numbers in his honda civic hatchback and it was fine. The rodeo flexes like crazy which some would say would absorb a lot of the energy but when the whole roof is bending the windshield back and forth it just eventually starts cracking at the edges.

This was average score with music on a term-lab over 30 seconds.
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Old 9th March 2012, 06:20 AM   #12
djQUAN is offline djQUAN  Philippines
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Quote:
Originally Posted by frompie View Post
What do you guys think?
I think it can.

http://www.youtube.com/watch?v=dPApRN97WRs
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Old 9th March 2012, 06:41 AM   #13
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Myth Busters Subwoofer Build - YouTube
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Old 9th March 2012, 07:02 AM   #14
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oh, do not even bring up mythbusters. that was an incomplete test, as a fair portion of their busting goes. they needed to bring it to a realistic audible range. that was mere compression and decompression.
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Old 9th March 2012, 07:12 AM   #15
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My first reaction to the question was: "It all depends on how hard you threw it!" but I after reading the previous posts I see I probably misunderstood the original question.....
Cheers, Jonathan
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Old 9th March 2012, 08:12 AM   #16
Input2 is offline Input2  Canada
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Back in 1969, I worked for a auto wrecking company, and my job was to move cars with a crane and stack it on a pile, about 30ft high. The crane had a big heavy hook that I had to hook right under the roof by the drivers side door.
I would take the hook on the end of that cable and just whip it against the glass, and many times the hook would just hit the glass and bounce back.
The tempered glass that is used for all the glass in your car except the front windsheild is very hard to break unless it gets pinched or thrusting a small sharp object against it .The glass is glued in with industrail grade urethane window adhesive, which also provides a good cushion for anything sharp.
Back in the early 1970's, when crome trim was still used,it was not uncommon to see a few rear windows just break, into small little peices, and that was caused by expansion of the glass into the steel clips used to snap the crome trim in place.
So I really doubt that a sub woofer can break that glass.
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Old 9th March 2012, 08:53 AM   #17
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It's easier to break a car window from the inside than the outside due to the convex shape....if you can keep the cab completely air tight it would but, with the metal panels flexing so much under the pressure it's almost not possible. I have seen windshields severely cracked from db drags but, never the windows shatter..... just my
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Old 9th March 2012, 09:16 AM   #18
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Use drivers with high Bl and strong cones. A tapped pipe with say 25 B&C 12TBX100 pointed directly toward the window should crack and break the window with ease.

Click the image to open in full size.

Add another 15 dB due to cabingain.
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Old 9th March 2012, 09:20 AM   #19
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Quote:
Originally Posted by AKHeathen View Post
oh, do not even bring up mythbusters. that was an incomplete test, as a fair portion of their busting goes. they needed to bring it to a realistic audible range. that was mere compression and decompression.
I know, but still it shows that it is not easy.

I would imagine that in order to break a windshield you would need to to hit the natural frequency of the windshield and lots of sound pressure.

And like Input2 said, in most cars with the windshield cushioned by the glue and rubber it think it will be very very difficult to break it with sound.
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Old 9th March 2012, 10:27 AM   #20
godfrey is offline godfrey  South Africa
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[ot]
I'm curious how the OP managed to edit the 1'st post 2 days later.
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