trunk rattles

I recently bought and installed two 12" Kenwood W3005's powered by a Kenwood 7201 amp.

When I turned them on and kicked up the bass, my trunk began to rattle so loud it could be heard inside the interior.

What should I do about it, without going to Dynamat(too expensive)?

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Kenwood all the Way!

check out the fitment of your hinges and the latch and make sure everything is snugged up. also check your weatherstripping, you could have an old car which might be dryrotted . also dynamat!

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blah blah blah blah

u can also use caulking or expanding foam in the trunk lid...the supports are just tack welded on and cause about 70% of the noise, I've only done 2 vehicles this way without dynamat or anything else and it made quite a difference.

I've got a 92 Plymouth Acclaim, so it is fairly old, I think ill try the foam and see if that helps.

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Kenwood all the Way!

Sounds like you need to get some kind of sound deadener. Dynamat is a brand you will hear quite frequently, and it is a great brand but its pretty expensive. you can try this stuff instead its 3 times less:
https://www.dhcsupplies.com/buildingpapers/bt20.htm
Same basic ingrediants however the ProtectoWrap is only 20mills thick and dynamat is about 45mills. But you can double up on the protectowrap.

Has anybody used that "Fatman" stuff, it looks like it might be another alternative because it's a good amount cheaper than dynamat, but I've never really heard from anybody that has used it.

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-Don't buy it, Build it-

go to eaudiodesigns and they have sound deadening material cheaper then dynamate and better.  I purchased 60 sqft for 83 dollars plus shipping

weld ur trunk shut, and fabricate it to be solid, also i will help keep people from poppin it open

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would u like your chicken original or extra crispy?

Is there any ways to stop the rattle... Very cheap?? such as things i could find around the house?.. i have a 77 impala and i have my subs in the trunk.. i get better bass with the subs in the trunk then the back seat but sounds worste on the outside..

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Wildcardwes

I think the license plate and frame can cause a good amount of rattle.  Make a cardboard cutout and place it behind the license plate or frame (like a sandwich).  I've had good luck with the undercoating spray (WalMart $2.67 or $3.67 depending on the WalMart from my experience, tall red spray can with blue and white text on it, in the auto section or next to car audio).  I've used the undercoating for my doors (made a big difference).  Experiment with truck bed liner spray (this may cost a bit more) and maybe even expanding insulation foam from Home depot (the when the expandign foam dries spray it with the undercoating spray).

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(1) Kenwood Excelon Head Unit KDC-X589 (24 bit Burr Brown DAC, 3 X 4 volt RCA).
(1) RF Punch 250A2 - running the components.
(1) Hifonics 6.5" Atlas Components (18db crossovers).

Wildcardwes wrote:

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Is there any ways to stop the rattle... Very cheap?? such as things i could find around the house?.. i have a 77 impala and i have my subs in the trunk.. i get better bass with the subs in the trunk then the back seat but sounds worste on the outside..

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the cheapest way? take out the subs.

If youve got the $$ for the stereo but not for the car itself, your prioities are outta joint

ppl have struggled with the rattle for ages- youre not the only one.

I have also had quite a bit of success with "Great Stuff" expanding foam.Very cheap in comparison,and very light wieght.Make sure to use the minimal expanding foam,for windows and doors i believe.The regular type can cause your panels to distort and bow out.Also make sure you have a bit of acetone or a can of carb cleaner on hand,this stuff can be very messy and it's extremely sticky.

if your plate rattles take some of your moms or gf's tampons take the plates off and put a couple behind the plate and re install...it's what i do..

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HU Alpine CDA-9855 Amp MA Audio 802sx 4,400 RMS 1 ohm Sub 18" MA Audio RMS 5,000 @ 1.5 ohm Ported Box Car 99 civic Si

LOL!!!

i think i'd stick to cardboard behind the plates.

"hey man, what'd u do to keep your plate from rattling"

"tampons, they're good for absorbing vibrations too"

Go through and make sure that the panels are secured, and that your trunk/hatch is tight. Carpet padding is cheap and will help. You could also try fire and ice roof waterproofing or peel and seal. its a cheap alternative to dynamat.