Hey so with my new sound system, everything in my car rattels and such, so i was gonna dynamat the whole damn thing, but its like 1.43 mil. for like half a square foot, so im wondering if anyone knows of any cheeper alternative to dynamat

 

the best thing i have found over 10 years of car audio is expandable foam found at any hardware store it is great for sealing in boxes, spraying behind panels etc it can get quite messy and takes some experience to know when enough is down i would recommend minimal expanding at first will cost more but wont damage anything they sell triple expanding but if u put too much in a certain place such as trunk lid it can bend the **** out of ur trunk dynamat is good dont get me wrong but this is a cheap alternative

 

A friend of mine bent the hell out of his trunk lid in an intrepid, so this will happen, he was using "Great Stuff". I used dynamat in my old accord. I could not really tell a difference. The original dynamat doesnt stick worth a crap. The xtreme sticks very well through and also stretches in concave/convex places.

 

A great product that's way cheaper than dynamat is "Raammat." Just type that in on eBay, and you'll find the dutch auction for it. One 62.5 sq ft roll costs around 100 bucks, and Rick (the owner of Raam Audio) has just released an even better version of the mat.

I matted my entire car last summer, 2 layers on the firewall, 2 layers on all 4 doors, 2 layers on the floor and beneath the rear seats, and 3 layers in the trunk (yeah, it's overkill, but I hear no road noise and my bass is very tight sounding), and it took about 3 and a half rolls of this stuff. Through 120 degree weather and 30 degree weather, it's held up. Check the seller's feedback... he has no negatives.

It really depends on what you're looking for and how much you want to spend. If you just want to stop rattles (and don't care about sound deadening), you can try stuff like putting carpet padding underneath your interior panels so that when the bass slams, the panel doesn't vibrate against the car metal.

 

I used dynomat xtreme for all my car and noticed a huge difference especially if your aiming for sound quality. There are other alternatives such a brown bread and b-quiet. expanding foam is another option but its really messy and as mentioned before will cause damage if you use to much.

 

Do you think Dynamatting my doors will bring out the bass in my 6.5"s? they are lacking and i paid $600 for these damn things.. well not really, i only paid $300. diamond audio 600S

 

midbass would be reinforced if you did it right. with the stock panels, they are probably vibrating too much that some frequencys are being cancelled out.

 

Another alternative is a product called "Roxul Safe and Sound." It's a sound deadening insulation, made of treated wool. It's fairly light and cheap. A giant pack of 10 pieces (about 50lb) is around $50. I tightly stuffed this in between the body panels from the doors back to the truck. Every body panel sounds dead where they were treated. Rattles are nil, road noise is substantially reduced.

Some cautions: wear gloves. This stuff can hold water, don't put it somewhere it can get wet.

 

Yeah im definately dynametting my whole damn car! As far as panels go im gonna have to figure that one out. How much Dynamat should i need to do both doors, floors and trunk? shall i do behind the side panels in the rear seat? seems like i should. thats thin metal.

 

i take it u got diamond audio components the best way to bring components and midbass out is to make an enclosure for them its pretty easy if u have experience with fiberglass and it helps take the resonance from the metal and components on the doors

 

also expandable foam is great stufff just cuz some retard bent his truck doesnt mean its bad it wont happen if u do it right as explained on the first post it really helps stop vibration

 

what places would you use the spray? I understand in the tight spots, but sometimes those tight spots really dont need it.

 

Expandable foam is only good if you don't want stuff moving in a certain place, but as far as sound deadening, it's not good because it lacks sufficient mass. When I did my car, I only used foam on the bottom part of my trunk lid (bottom as in when it's open), but it wasn't really that necessary.

Swaytech's exactly right... if you want tight sounding midbass, then you should make an enclosure for them, preferably in some kick panels. With the door panels attached to the door, no amount of dynamat is going to make it stop rattling (even the itsy bitsy rattles) if you're playing some nice midbass.

Just stick with matting your car... and if you really wanted to kill road noise, put a layer of carpet padding on top of that. Just make sure that you use a really strong glue or really cake on (I mean really, really put a lot) the 3M spray glue so that the carpet padding doesn't fall off of the dynamat on your doors when it gets hot.

If you're really planning on doing your whole car, to you... it's a lot of work, but it's satisfying in the end. Depending on how much mat you use and how big your box and amps are, it'll probably feel like you're carrying an extra passenger all of the time... oh well.

 

yeah im doing the whole car. How much weight are we talking about? it should be however much both BULK packs weigh. The turbo is going on so it shouldnt be TOO bad. I dont race at the track anyways. Im an all around performace. Gotta have the audio!

 

depends on the weight of the material itself. Some people are able to get the whole car with only about 70lbs total..others take about 120lbs, etc.


http://www.edesignaudio.com look at the edead v3. its the liquid version and weighs much less than the regular mats when its cured.

 

i did great stuff yesterday, and it worled very well....kinda messy and a pain in the *** to get the panels off and such, but it was a very noticable difference. No more rattling and better bass!

 

yeah its good when u use it right when filling big gaps or sealing off and enclosure in ur trunk u can use triple expanding foam the best way to stop rattling ive found in trunks not especially hatches is to wall the box in towards the cab or passenger compartment using wood then fill the gaps with expandable eliminates rattles from the rear also put saran wrap down in places u dont want to get the foam on it will ruin carpet etc u can use saran wrap on everything then foam on top it will stay till u want to remove which is kinda tricky scrapy and breaking it away but its just foam

 

For a full deadening job using mat, it will take more than 3 bulk packs of Dynamat.

If I were to use a mat, I'd use the new Raammat BXT Butyl mat (superior to the previous asphault version, it is now in league with Dynamat Extreme, secondskin damplifier, madmat, and other butyl mats).

Each roll is 62.5 ft^2. It would take 3 rolls for a full install.

If I were concerned about weight, I'd buy 1 roll of that mat, and the rest would be a liquid deadener such as the mentioned Edead v3 or Cascade Audio's liquid deadener (something similar to this). Get a 5-gallon package and brush or spray-on.

The mat is just more effective...so I'd spray a thin coat of liquid, then use 1 layer of mat, then cover in liquid. It depends on the region of course, though.

Expanding foam works great to stop localized rattles, but be careful with it. Use gloves (DO NOT get that on your skin) and be sure to cover up everything in the work area...

Expect 40+ hours of labor for the type of job I'm talking about. I'm not sure how serious you are here...

If you just want a moderate job, then 1-2 rolls is fine. Some of us are insane though...eheh