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It's a basement room, concrete floor, 2\4 walls, armstrong ceiling, 12x18x7 with stairs at the real that are closed on all sides but the bottom into the room. The floor has cheap burber carpet with good padding. There is only one couch and one chair.The audio system is currently MCH with JBL 123A woofers in all four corners and a Paradygm 7e for center. The paradygm is temporary. Amp is Panasonic SA-XR45.
The room is bright and has close high frequency ringing an the hand clap test.
I'm in need or treatments but they have to be DIY and I have to make them look nice.
I'm considering the following:
1.Build several pannals with a duct board backing and 1" egg crate foam 18" by 2 and 4 foot to place on the walls near the speakers to help with the near reflections.
2.Using the same construction but with thicker foam for pannels in the middle of the sid walls.
3.using the same construction as #2 but several smaller ones for the front wall. This wall will eventually get a JBL 123A for center as well and the treatments will go on either side.
4. I'll stuff any empty cavities in the couch with fiberglass and mount a duct board under it to absorb some lows but the couch will be in the center of the room. Or should I use fireglass boards in stead?
5. Apply foam to the backs of the front speakers.
Does anyone have any other recomendations or comment?
Where is the best place to buy foam for control? Even if it's raw blocks.
Thanks, Scott
Follow Ups:
See:
The original DIY Acoustic Treatment Note:
http://www.geocities.com/jonrisch/a1.htmAND
http://www.geocities.com/jonrisch/a4.htm
Jon Risch
Is duct board effective for mids and highs?I'd like to keep the wall pannels thin. What's the best compromise?
The front wall is 8 feet out from a concrete basement wall and one side wall is 12 ft. Can I build the base trap panels behind the sheetrock?
There is currently 3.5" of fiberglass behind the front and side walls. Is this doing anything for absorbtion?
If the duct board is what I think it is, then, no, it will not do much for absorbing anything.Thin wall panels can only help with the mids and highs, and the thinnest I would recommend would be the 3 1/2" fiberglass on the 1X2s. Add some semi-rigid fiberglas on the back (some 705) for a bit more LF absorption, but this adds another 1" to the panel thickness.
Idealy, any sound absorbing panel should be spaced out from the wall, this improves it's LF absorption, but you could flush mount if absolutely necessary.
Just remember that too much absorption of the mids and highs, without corresponding absorption of the lows, can unbalance a room toanlly, and make it sound boomy.
Yes, bass traps could be placed "behind" the walls, as long as they were properly constructed and sealed, etc. This would only lend it self to square/rectangular based traps, such as Ethan W. recommends.
Fiberglass behind the drywall is not doing that much to absorb sound, perhaps some in the bass, but virtually nothing in the mids and highs.
Jon Risch
Hi Scholl;First off, take a look at Thorsten's "felt discs on the walls" tweak to deal with the slap echo. It's cheap, (hopefully) won't mess up your lease (or get you thrown out by the SO or whatever), and works.
Second, I'd suggest you look at Jon Risch's room acoustics tweaks on his site. Do a search of the archives to find the URL if you don't have it already.
Good luck!
All the best,
Morse
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