In wall speaker boxes - AVS Forum
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post #1 of 5 Old 05-11-2011, 04:22 AM - Thread Starter
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I'm the guy with the home theater in the lower level of my townhouse who is correcting the builder's mistake in not putting a rim joist where the deck connects to the back of the house causing a big air leak. While the wall board is down I want to improve sound isolation as much as possible.

This forum has initiated much research on my part about how to best solve the air leakage and isolate sound. I'm still working on it but want to start building in wall speaker boxes.

Questions

I have six Sonance in wall surround speakers and intend to sound isolate them with double MDF boxes. I'm going to use ½ MDF and connect the speakers to the inside of the box. My question is, should I spread the green glue evenly with a trowel the space between the pieces of wood or should I put on the glue as I would on wall board with air gaps between the beads of glue.

http://www.avsforum.com/avs-vb/attac...1&d=1305112758

The sketch shows the proposed cross section and green glue.

Are there any comments on this?

Thanks

Keith Lingenfelter
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post #2 of 5 Old 05-11-2011, 05:15 AM
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PM Ted White, IMHO you do want 100% coverage. Since you are going to the trouble why aren't you using 3/4 MDF? More mass is always better.
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post #3 of 5 Old 05-11-2011, 05:21 AM - Thread Starter
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Thanks apply the green glue, then smooth for an even coating with a trowel and then clamp together.

One more question if I clamp the two MDF peices together will the green glue be suffiecient to hold the box together or will I need screws also. I also assume that over clamping to sqeeze out to much green glue is not good, light clamp pressure until it cures. Am I correct?

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post #4 of 5 Old 05-11-2011, 05:23 AM - Thread Starter
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And I have room so 4 layers it is.

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post #5 of 5 Old 05-11-2011, 06:29 AM
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Quote:
Originally Posted by klingenfelter View Post

... apply the green glue, then smooth for an even coating with a trowel and then clamp together.

I would leave ridges. Personally I would simply squirt the GG on the pieces and screw together.

Quote:
Originally Posted by klingenfelter View Post

One more question if I clamp the two MDF peices together will the green glue be suffiecient to hold the box together or will I need screws also. I also assume that over clamping to sqeeze out to much green glue is not good, light clamp pressure until it cures. Am I correct?

Screw the panels together, use as much overall mass as possible, consider using an IB3 to connect the box to the framing to further minimize conduction. I would not clamp.

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