Dynamat or Fatmat - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
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post #1 of 32 (permalink) Old 02-24-2010, 06:12 PM Thread Starter
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Dynamat or Fatmat

How do I put these in my trunk? I know there was a thread about it before.. Or at least about trunk rattling, but I'm too lazy to go through and read it. Lol.
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post #2 of 32 (permalink) Old 02-24-2010, 06:34 PM
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my car had 6x8s even though I bought 6x9s...sooo... I brought it to stereo shop to have them mounted professionally. I had them dynomat the top deck (around the speakers). And I get no rattle (only with a 400w 12"). So without an insulated truck. I'm doing fine.

I know I didn't answer your question, but just my insight.

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post #3 of 32 (permalink) Old 02-24-2010, 06:51 PM
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dynamat, fatmat. same product. what you want to look for is the thickness. There is .5 and .8 mil thickness, obviously the thicker one will do a better job but some people like to do 0.5 to cut down on weight, or two layers of 0.5 for an improved effect. I used 50 square feet of fatmat in my civic trunk and it completely stopped the rattle and increased the sound quality and volume (i also tightened my trunk latch to cut down on shaking). I suggest ordering a roll of fatmat off ebay, it's much much cheaper and I can tell you the quality is great. I will be gutting my cobalt hopefully this summer and installing 100sq feet everywhere in my car to maximize quality and volume. should be sick! any questions feel free to PM me!
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post #4 of 32 (permalink) Old 02-24-2010, 06:53 PM Thread Starter
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Lol well I have a 12" and it's rattling bad.

---------- Post added at 09:53 PM ---------- Previous post was at 09:52 PM ----------

I just bought 25 feet of fat mat. I just am not sure where to put it?
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post #5 of 32 (permalink) Old 02-24-2010, 07:06 PM
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Quote:
Originally Posted by kylahd09 View Post
Lol well I have a 12" and it's rattling bad.

---------- Post added at 09:53 PM ---------- Previous post was at 09:52 PM ----------

I just bought 25 feet of fat mat. I just am not sure where to put it?
Locate the rattling. 25 feet is not a huge amount. In cobalts, the main rattle is the stupid dome light, and the big piece under the rear window. I would say use most of it on your trunk and trunk lid, tighten your trunk lid latch so the trunk closes tighter, and put a little bit under that rear window panel. You might also need to stuff something else underneath that rear window panel in order to solidify it from shaking. I'm planning on taking my entire headliner off and doing all underneath it then putting it back on. I'll probably stuff something between the roof and headliner where the dome light is to make it tighter fit and stop the damn dome light from rattling.
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post #6 of 32 (permalink) Old 02-24-2010, 07:13 PM Thread Starter
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How do I tighten the trunk lid latch?
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post #7 of 32 (permalink) Old 02-24-2010, 08:27 PM
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Originally Posted by kylahd09 View Post
How do I tighten the trunk lid latch?
open your trunk, look down, in the center there is a latch which holds the trunk lod closed. There are 2 bolts. Loosen them (after your fatmat install) and you can move the latch slightly up or down. Move it slightly downwards, then tighten it, then try and close the trunk. If you have trouble, loosen again and put it a bit more up. It should be a very snug fit to avoid any shaking from subs. Keep in mind that before doing this, you should fatmat your trunk lid and trunk back, including around the trunk latch, which should also help keep a tight trunk lid seal and avoid trunk lid shaking.

Tip to installing the fatmat; do it on a warm or hot day, since the fatmat will be softer, stick better and conform to the car's body much better. Make sure you roll it on real well, and if there's small deep spots (for example on the trunk lid) then cut a small piece of fatmat to fit into the deep spot to try and make it flush, and then cover it with a bigger sheet of fatmat. Try and cover as much area as you can with large, single pieces as opposed to cutting many smaller pieces, since this will give you the best results. Any more questions, don't be shy!
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post #8 of 32 (permalink) Old 02-24-2010, 08:35 PM Thread Starter
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So 40 degree weather wouldn't be good? lol.. Cause we put my system in today and I don't even want to hear it because how bad it is rattling. I probably have the speaker or amp up too high. I don't know. I loooovvvveeee bass
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post #9 of 32 (permalink) Old 02-24-2010, 08:48 PM
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If weather does not permit, you can always heat your fatmat with a blow dryer. Just make sure to take your time and do it well, covering all inside surfaces. The fatmat may not completely demolish the rattling but combined with the tricks I mentioned before, you should be rattle-free. Love my bass too! Good luck w/ the install
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post #10 of 32 (permalink) Old 02-25-2010, 10:25 AM Thread Starter
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Thanks..I just started putting it on my trunk lid.. I had to come in cause my hands were numb lol
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