rev

which is the best sound deadener... my bass sounds great in the car but outside it sounds like i kidnaped someone and their trying to break out of my trunk hitting everwhere making nast rattling noise

i was wondering which would be the best product...

ebay has the flatmat
eBay Motors: Fatmat Trunk Sound Deadener Kit + Free Dynamat Roller (item 120255959424 end time May-10-08 21:09:09 PDT)

i was also thinking of the dynamat xtreme
DYNAMAT NEW XTREME WEDGE PAK SOUND DEADENING * 10425 * - eBay (item 250242743815 end time May-09-08 09:30:10 PDT)

my trunk has one of those tail light that runs right across it... so yea... that makes ir worse

the dynamat is i think 37$ shiped for 4 square feet
i would wondering which one u guys think would be best... i might need to do inside top of trunk because my spolier rattles... i think its that gay break light it has one it... i tried putting silicone around it and screwing it back on but nothing... still rattles... hoping one of those products will solve my problem

Westec

iTrader: (1)

B-queit 50 square feet of roughly $120...

rev

would that be the extreme or the ultimate one? and it's better than those other products?

MTT

iTrader: (17)

Sound Deadener Showdown <---clicky

JohnVroom

so what is a sound deadener? how does one measure the level of death?

damping is measurable on the other hand

MTT

iTrader: (17)

Why be so critical of terms?....technically, you can't measure damping on one hand or the "other"

Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
dead·en·ing Audio Help /ˈdɛdnɪŋ/ Pronunciation Key - Show Spelled Pronunciation[ded-n-ing] Pronunciation Key - Show IPA Pronunciation
–noun
1. a device or material employed to deaden or render dull.
2. a device or material preventing the transmission of sound.
3. a woodland in which the trees are killed by girdling prior to being cleared.


Dictionary.com Unabridged (v 1.1) - Cite This Source - Share This
damp·ing /ˈdæmpɪŋ/ Pronunciation Key - Show Spelled Pronunciation[dam-ping] Pronunciation Key - Show IPA Pronunciation
–noun Physics.
1. a decreasing of the amplitude of an electrical or mechanical wave.
2. an energy-absorbing mechanism or resistance circuit causing this decrease.
3. a reduction in the amplitude of an oscillation or vibration as a result of energy being dissipated as heat.


Both are actual terms, the O/P asked specifically about "deadener"

rev

i got the extreme from what i seen from your site the extreme came out decent on the tests... which is good because i want to screw my amps down behind the backseat would it be safe to with the dynamat under it?

JohnVroom

Well though I do not recognise the dictionary, your post makes my point! damping is one thing (damping) and deadening is another (according to the dictionary referenced it is transmission loss). STC is not damping, that is, ASTM 90 is not ASTM 756

The term is misused and not really understood since every item discussed is a damping material (ASTM 756) and not a very good TL product (the mass load provides the transmittion loss for ASTM 90)

And you are correct the hand is not the correct measuring device

JohnVroom

sorry but I am trying not to use marketing gimmicks as technical terminology and car audio is as much a study in acoustics as it is electricity. We criticize manufacturers who exaggerate benefits so this seems a fair nit to pick.

I would like to know what advantage damping gives me and why, and I would like to know what advantages transmission loss gives me and why. This seems like a fair concept prior to purchase.

These ARE NOT sound attenuation products (ASTM 423) so we wont bring it up as a part of the solution.

Am I off topic?

rev

umm i only put sound deadener because it was the term used on ebay :S