MDF and sound deadening...

[RJesus 10+ year member]

How does MDF compare to things like damplifier from SS and dynamat?

Reason I'm asking is because I'm planning on making a false floor in my trunk and putting my amps under it.

Should I just make the false floor out of fiberglass? Or would it be beneficial to make it (mostly) out of MDF and create difficult contours out of fiberglass?

I have yet to sound deaden my car, so I was thinking.... if I make the false floor in my trunk out of fiberglass, should I still sound deaden the bottom of the trunk that the MDF is ontop of?

MDF is a lot cheaper than sound deadening material......maybe I can utilize it in more places //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

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[RJesus 10+ year member]

anyone?

 

[RetroAudioinc 5,000+ posts]

What kind of truck. I am doing the same thing in a chevy 2500hd 4 door. Deadening back wall under back seat 1/3 side and deadening under my false and also deadening the under side of the of the false floor just give it a little extra help..

 

[Rudy 10+ year member]

It doesn't really compare since those products are vibration dampers. If you put a layer of resilient foam under the MDF, the foam will compress between the sheet metal and the MDF and damp vibrations that way.

It's more comparable to a barrier like lead or MLV. Here mass is important and MDF is pretty heavy. It will do a pretty good job of blocking noise tat hits it. You'd also want the foam under it in this application. MDF isn't going to perform quite as well as a limp mass barrier, but it should be pretty effective. Whether or not it does anything is going to depend on whether or not noise is coming into the vehicle through the area that will be covered by the MDF. In the trunk that would be rear tire and exhaust noise primarily.

If you're mostly interested in increased SPL, it should be more effective than any vibration damper.

 

[RJesus 10+ year member]

It doesn't really compare since those products are vibration dampers. If you put a layer of resilient foam under the MDF, the foam will compress between the sheet metal and the MDF and damp vibrations that way.
It's more comparable to a barrier like lead or MLV. Here mass is important and MDF is pretty heavy. It will do a pretty good job of blocking noise tat hits it. You'd also want the foam under it in this application. MDF isn't going to perform quite as well as a limp mass barrier, but it should be pretty effective. Whether or not it does anything is going to depend on whether or not noise is coming into the vehicle through the area that will be covered by the MDF. In the trunk that would be rear tire and exhaust noise primarily.

If you're mostly interested in increased SPL, it should be more effective than any vibration damper.

it wont harm the SQ, will it?

and if you don't mind my asking, where in maryland are you? do you do local pickup's on ssd?

 

[Rudy 10+ year member]

it wont harm the SQ, will it?
and if you don't mind my asking, where in maryland are you? do you do local pickup's on ssd?

Owings Mills - 15 miles NW of Baltimore. I do but you'll have to pay Md. Sales Tax. Still cheaper than shipping.

 

[nineball 10+ year member]

use mdf on all large flat areas over fiberglass. fg has it's greatest strengths on curved surfaces. mdf is way cheaper and easier to work with.