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  3. 1202554738

Room Acoustics overkill or worse?

Would acoustically treating the ENTIRE back wall behind the speakers be overkill? This is mainly for aesthetic reasons. What I would like to do is to break up the back wall into 9 4’x3’x3” (WxHxD) modules and treat with Jon Risch’s design but flush with the wall. I have some questions regarding materials:

1. Can one substitute the fiberglass with poly bat entirely
2. Can anyone tell me if it’s a bad idea to use 1”, 40 grade foam sheet or a 1” coir sheet rather than the rockwool panel for the back.
3. Instead of burlap can I use raw silk. (wife’s suggestion)

For now I just have foam in different densities stacked behind the speaker (total thickness about 3”) and it made a huge difference. I also ‘stole’ 4 of my wife’s cushions and stuffed them with poly fill and have those in the corner which improved things even further. I would be happy if I got the same effect from the above design.

Thanks in advance for any comments/suggestions.
keroo1099

Showing 3 responses by keroo1099

keroo1099 OP
35 posts
 
thanks for the advice. The reason for making it in modular form was to have the option of removing a panel or two if required.

Any suggestions on using the coir vs rockwool?
keroo1099 OP
35 posts
 
one last question on this topic before I start on the wall. What frequencies does the rockwool panel control and what frequencies does the fiberglass insulation absorb?

Thanks
keroo1099 OP
35 posts
 
thanks for all the replies suggestions. I should have described my setup better. Sorry I have to get down to posting my system soon............

The room is 15'x12' with a sloped ceiling along the shorter wall. I have large french windows along one of the 15' walls and an 8' opening on the opposite side into a double ht. living room. The walls are 9" brick with cement plaster. The ceiling is concrete, but covered from below with pine wood slats. The floor is a hard cement mosaic floor. Typical construction in India.

The speakers consist of a pair DIY 15" subs, which are ported at the back and a pair of sealed MTM's along the shoter wall. I have have no resonance from any of the cabinets. Solid 1 1/2" MDF. I usually put a carpet on the floor. I also have a 25" TV between the speakers.

So far the foam treatment has really cleaned up and tightned the sound. The most pleasing change has been the increase in scale and body of the instruments. I wanted to put panels behind the speakers and in the corner but better half frowns at that idea.................
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