Complete sound system overhaul

**2fnloud** · 09-15-2010, 04:20 PM

As far as air tight, it does have a real snug fit but prolly not air tight. But the speaker is sealed in it's own chamber, so it really will not matter.

**MADMarc** · 09-15-2010, 04:46 PM

Very curious to see the end product. Thanks for the info.

**2fnloud** · 05-02-2011, 10:19 AM

With the weather finally starting to warm up enough, I am able to start working on this project again.

With the hatch plastic out for the installation of my rear strut bar, I decided to start to sound deadening the hatch and hatch floor.

I went with the 25% coverage approach in order to save weight. Also when you are using products like this the main intent is to eliminate the resonance from the metal.
It has been proven that 25% coverage does this properly. I will elaborate:

I pulled my resources from Sound Deaner Showdown:

The owner of SDS Don Sambrook, has been extremely helpful answering my barrage of questions. I came from the old mindset that you cover everything with the aluminum stuff and if it wasn't cutting it you just added another layer.

He isn't the cheapest, but his prices are in line with the competition, plus his website started as a info about sound deadeners before he had is own product line.

Here is what sold me on why 25% coverage is more than enough:

Originally Posted by From SDS website

Time for a demonstration. This is a 12 inch square of 22 gauge steel suspended by the top corner and struck in the center of the side facing away from the camera with a xylophone mallet. The piece on the left has no vibration damper applied and the piece on the right has a 6 inch square applied to the center (25% coverage). You can see the measurement microphone jutting in to the photos from the left. Play the two sound files and tell me there is any point in adding more vibration damper.

undamped | dampened

The next step is Closed Cell Foam and Mass Loaded Vinyl (CCF & MLV):

I am undecided if I want to go this far yet in the hatch, the MLV adds allot of weight...like 1lbs per square foot. I inquired about just using the CCF but Bob explained to me that the CCF doesn't really do much by itself, it mainly acts like a vibration dampener between the MLV and metal surface you are wanting to soundproof.

Anyways enough of explaining my decision.... on to the pictures:

As you can see I have more than 25% coverage on the hatch floor....oh well

**reallyxxxxxxloud** · 05-08-2011, 09:49 AM

I found his web side very contradicting. Saying we have gone about it all wrong with sound deadening. Multi layers produce poor results wtf. Yes his idea of putting the deadening in the areas of a larger panel (not needed on heavy curving) as this will stop most of the metal ringing/resonating. Best money vs results. But sound deadening in multi layers (say three) will achieve double the dampening through mass. Closed Cell Foam and Mass Loaded Vinyl I've been using for years along with multilayers of deadening- I think he should of been a little more clear on what he was saying.