Sound deadening for SQ

[abmoore 8]

Sorry for another question (just taking advantage of my day off). I just finished up damping my door panels, the sheet metal, framing, and plastic panels,as well as the rear hatch with eDead 120 and Damplifier Pro. Probably have used about >80 ft^3 so far. I am doing my entire roof and going to do the floor soon too but I am having trouble deciding what to do next. I keep reading very different theories about what to do, whether to use closed cell foams or open cell foams and where to use them. Some of you have recommended websites to buy different products but just need to know how much and what to buy. I have a lot of room in my doors between the interior plastic and sheet metal panels, at least more than I see in other cars. Oh, and this will be in a 2004 Chevy Tahoe.

[audiolife 14]

Sorry for another question (just taking advantage of my day off). I just finished up damping my door panels, the sheet metal, framing, and plastic panels,as well as the rear hatch with eDead 120 and Damplifier Pro. Probably have used about >80 ft^3 so far. I am doing my entire roof and going to do the floor soon too but I am having trouble deciding what to do next. I keep reading very different theories about what to do, whether to use closed cell foams or open cell foams and where to use them. Some of you have recommended websites to buy different products but just need to know how much and what to buy. I have a lot of room in my doors between the interior plastic and sheet metal panels, at least more than I see in other cars. Oh, and this will be in a 2004 Chevy Tahoe.

Deadening is alot of trial and error. When people go over their vehicles with 3 layers of mat or a mat and spray that is a lot of over kill IMO. Closed cell foam and other coverings help absorb what might be reflected. This can really help or hurt the way your system sounds in a way an eq and time alignment cant. This is why when you look at some SQ comp cars they have covers on their dash and additional covering on the dash under panels.

If I were to start a new car I would use butyl tape to get out panel on panel and metal on metal rattles. When you use mat or sprays generally speaking you are going to get the vast majority of the usefullness out of it when you have a large panel 50% covered. (some will say more some will say less).

[Duran 387]

25% coverage is maximum recommended for dampening mat, on top of that use a mass-loaded barrier.

Don, who owns this company: http://www.sounddeadenershowdown.com/cgi-bin/index.cgi is extremely intelligent when it comes to deadening. Ask him anything about his products or how to solve a problem you can't figure out, he'll be glad to help.

[abmoore 8]

25% coverage is maximum recommended for dampening mat, on top of that use a mass-loaded barrier.

Don, who owns this company: http://www.sounddeadenershowdown.com/cgi-bin/index.cgi is extremely intelligent when it comes to deadening. Ask him anything about his products or how to solve a problem you can't figure out, he'll be glad to help.

I have been searching for that website, I saw it a while ago and then completely forgot where I found it. I covered about a third of the panels with the dampening mat just to be safe. I will try and contact him with the rest of my questions. Thanks.

[Impious 1,476]

The first question is what are you trying to accomplish? We can't tell you how much and what to buy if we don't know what you are trying to do.

A very brief overview;

If you are trying to reduce road noise, you need something with mass. Some people come up with creative ways of achieving this.....the simplest however is MLV which Don sells. Problem is it's heavy and expensive to ship. To work most effectively, it needs to be decoupled from the surface it's covering.

Closed cell foam doesn't absorb sound well, it diffracts sound. If you are trying to block road noise, this isn't the product to use. If you are trying to absorb reflections, this isn't the product to use. It does however work well as a decoupler for MLV.

Open cell foam absorbs sounds. The frequency range it works most effectively in is dependent upon several factors, not the least of which is thickness. As you try to absorb sounds lower in frequency, you need increase the thickness of the foam. Generally for open cell foam to effectively absorb a frequency the foam needs to be the thickness of a 1/4 wavelength of the frequency. Due to the thickness requirement, a foam thick enough to absorb road noise will be too thick to actually use. OCF can be used to control reflections from the speakers (again, with the bandwidth of effectiveness related to the thickness of the foam).

[///M5 2,833]

25% coverage is maximum recommended for dampening mat, on top of that use a mass-loaded barrier.

Don, who owns this company: http://www.sounddeadenershowdown.com/cgi-bin/index.cgi is extremely intelligent when it comes to deadening. Ask him anything about his products or how to solve a problem you can't figure out, he'll be glad to help.

I have been searching for that website, I saw it a while ago and then completely forgot where I found it. I covered about a third of the panels with the dampening mat just to be safe. I will try and contact him with the rest of my questions. Thanks.

You actually don't even have to ask him, just read his website and then use what you learn to apply a better question here. I am sure he will also stop in and see your post, but we will also. Unlike other companies who just want to sell, Don just wants to help. Of course he is in business to sell product, but has never misled someone on any forum I have ever seen. I can't say that about any other deadening company.

[mccleery3 166]

I ordered some of the CLD tiles from Don and couldn't be happier with the product thus far from a visual aspect. It isn't installed yet but will be soon. I spoke to Don personally and he was a pleasure to speak to, very knowledgable. I'm sure he could answer any questions or concerns if the info on his site doesn't. Just my 2cents