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Old Jan 1, 2009 | 03:20 PM
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Default Subwoofer concerns

Hey just wondering if anyone has ever had any problems with the vibrations from a subwoofer in the back of a c3 causing any problems with fiberglass on the rear deck. I have a single 8 inch JL and it seems to cause a good bit of vibration on that panel.. Any Suggestions on what i should do?
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Old Jan 1, 2009 | 03:24 PM
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Originally Posted by Dante7
Hey just wondering if anyone has ever had any problems with the vibrations from a subwoofer in the back of a c3 causing any problems with fiberglass on the rear deck. I have a single 8 inch JL and it seems to cause a good bit of vibration on that panel.. Any Suggestions on what i should do?
Try lining the rear deck with sound absorber like Dynamat or something similar.

cc
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Old Jan 1, 2009 | 06:41 PM
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3-4 layers of dynomat and you should be good....
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Old Jan 1, 2009 | 07:34 PM
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How is it mounted?
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Old Jan 1, 2009 | 08:17 PM
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its just in a box behind the passenger seat. How think of dynamat should i get i see summit carries different thicknesses
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Old Jan 1, 2009 | 08:35 PM
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get the thick stuff.....and make sure to pre heat it with a heat gun so it sticks better
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Old Jan 1, 2009 | 08:52 PM
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I have two 8" JL audio subs and no problems after almost 10 years.
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Old Jan 1, 2009 | 09:00 PM
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Where's DB when you need him?
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Old Jan 1, 2009 | 09:47 PM
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HA, I bought my Corvette from my brother, when he had it he had two 12 inch subs in it with something like a 600 watt amp, no issues with the car, but your head....different story.
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Old Jan 1, 2009 | 10:15 PM
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Originally Posted by onaqwst
3-4 layers of dynomat and you should be good....
ummmmm.......only 1 layer is needed. I used DynaMat Xtreme. I installed a layer under the deck in my coupe. I have a 10" Clarion thinline and it bumps hard. No vibration on the outside at all. That is some good stuff. Won't ever build a car without it, firewall to trunk, door to door. PERIOD
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Old Jan 1, 2009 | 10:17 PM
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Originally Posted by onaqwst
get the thick stuff.....and make sure to pre heat it with a heat gun so it sticks better
Sorry, but........not needed. Just let it come to room temp, it installs just fine.

Again, DynaMat Xtreme, some of the best stuff I've used since it came onto the market.
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Old Jan 2, 2009 | 10:08 AM
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Originally Posted by BigBlockTank
Sorry, but........not needed. Just let it come to room temp, it installs just fine.

Again, DynaMat Xtreme, some of the best stuff I've used since it came onto the market.
BBT, We're in Michigan, it has to be heated to reach what passes as room temperature where you live!
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Old Jan 2, 2009 | 02:09 PM
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i'm running 2 jl10w6v2..... i needed the extra layers...

i also used dynomat extreme for my entire car and used a heat gun.... it will not come off now and has a nice solid feel to it.
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Old Jan 2, 2009 | 02:29 PM
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I used dynamat extreme and it works well. I first set up my crossover points so the sub sounds good. Mine is crossed at 80hrtz down other go 100 or 120 htrz. You may find by changing your xover point will eliminate some of your rattles. What ever way you go, if you still have rattles you may have to tighten some screws or use some dum dum where the pieces of plasic or fiberglass meet to stop the squeek. Eventually you will eliminate all squeeks. I can't beleive and 8" single can be creating that many squeeks or rattles.



Good Luck
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Old Jan 2, 2009 | 02:37 PM
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Its not creating that much rattles i was just concerned that over time it may damage the fiberglass from the vibration of it. Would anyone be able to give me an approximation of how many square feet i would need. I would figure it out but the vette is in storage over 2 hours away at the parents for the winter.

Last edited by Dante7; Jan 2, 2009 at 02:40 PM. Reason: adding a question
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Old Jan 2, 2009 | 03:36 PM
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Originally Posted by Dante7
Its not creating that much rattles i was just concerned that over time it may damage the fiberglass from the vibration of it. Would anyone be able to give me an approximation of how many square feet i would need. I would figure it out but the vette is in storage over 2 hours away at the parents for the winter.
You won't damage the fiberglass. The rear compartment takes about 10 sheets. Buy a box 15 or 20 sheets and ebay the overage
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Old Jan 3, 2009 | 10:32 AM
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Simplest things first. Look at Crutchfields web site for box stuffing to give you an idea of what you need and how much. Polyester box stuffing will eliminate resonance from you speaker and is fairly inexpensive.
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