I'm trying to improve the acoustics of my 24x16' home theater room.
The first problem I'm tackling is to reduce noise from the HVAC unit, which is located directly on the other side of the left wall. My current plan is to put up either one or two layers of 5/8" drywall with Green Glue on that wall.
However, the left wall also contains a 30x16" HVAC return, a few feet from the corner with the screen wall. The drywall/GG should attenuate lower frequencies, but the return makes a fair amount of air noise, sometimes causing me to increase volume if the HVAC unit comes on during quiet dialogue. Moving the return is not possible.
My first thought was to build an external baffle, something like a drywall/Green Glue sandwich framed by wood? This would be slightly larger than the return and serve to block the direct sound. It would be offset far enough from the wall for adequate airflow around it. The HVAC filter is located elsewhere, so I don't need access to the return. This would also allow me to remove the metal grille, which might reduce noise a bit more.
Is there a better way? I imagine my wife is not going to like that protuberance on the wall. I suppose I could put one of my 28x41 poster frames over it, although I'm not sure how that will look.
Another idea is something like this, does anyone have any experience with these grille silencers?http://www.mfmca.com/storefront/p-32-16-wide-units.aspxhttp://acousticstandards.com/acousti...cersgrille.cfmhttp://www.aerosonics.com/catalog/GRILLE.PDF
I'm not at all concerned with keeping HT noise in, only reducing HVAC noise to a reasonable level inside the theater.
Also, I'm not married to any of these ideas (but hope to remain married to my wife after this is done
). I bought a case of Green Glue, but that's all I've done so far. I have a highly skilled carpenter friend helping me.
Any advice greatly appreciated.