#1936397 - 05/03/08 09:19 AM
My theater / acoustic design plans
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jeffro
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Registered: 04/15/08
Posts: 3
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Hi All!
I just bought a few bundles of OC703 with plans to acoustically treat my basement home theater. I'm looking for a bit of guidance on this.
Right now my objectives are to treat the low frequencies and tackle the first reflections. My thought is to put 'super chunk' traps from floor to ceiling in the 3 wall-wall corners available. I will then build a couple 2" 2X4 absorbers of OC703 that will be mounted right against the wall at the first reflection points.
Below I've created a layout, which requires a little bit of explanation. First, the grid lines you see every so often are drop downs in the ceiling for ductwork (about 8" usually) and aren't really relevant to this. Second, the speaker positions are approximate, and will actually all be adjusted when I get treatments in the room. Third - the only treatment I've placed in the diagram are the corner traps, which are shown in blue. I have yet to measure out the first reflections, but I think this may be tricky due to the open right side.
http://picasaweb.google.com/jrames/TheaterPics/photo#5196182471775025394
Note the main theater room is about 18X21. The entire basement is about 31X21 with much of the additional being an enclosed room.
Any input is appreciated!
Thanks,
Jeff
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#1936806 - 05/04/08 11:07 AM
Re: My theater / acoustic design plans
[Re: jeffro]
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Ethan Winer
MP Hall of Fame Member
Registered: 06/12/00
Posts: 5227
Loc: New Milford, CT, USA
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Jeff,
I don't usually suggest making a small room smaller, but in your case the right side should go straight back if possible. Can you build a "wall" from cardboard or very thin (1/8 inch) wood there? That will make the left and right symmetrical at mid and high frequencies. If you then fill the entire cavity with fluffy fiberglass, you'll also get additional bass trapping. A thin wall also does not make the room smaller at bass frequencies.
Also, don't ignore the other eight corners. Wall-ceiling and wall-floor corners are just as valid as wall-wall corners. Maybe you can fit more traps at the bottom of the front wall under the screen?
--Ethan
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#1936969 - 05/04/08 06:09 PM
Re: My theater / acoustic design plans
[Re: Ethan Winer]
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jeffro
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Registered: 04/15/08
Posts: 3
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Ethan -
Thank you for the feedback. Just so that I'm clear - can you confirm that what you are suggesting is extended the wall as I've shown in red here:
http://picasaweb.google.com/jrames/TheaterPics/photo#5196690991607904514
Right behind that is the staircase, so I'm hesitant to fill that whole area up with fiber  I could build a wall and door there potentially, but my hesitation is that I am not sure how long I'll be living here. I'm worried some people might find the layout odd when I went to sell the house.
I'm going to try to think of some less permanent alternatives. I assume it is important that whatever I build be flat and parallel to the wall on the left? Would something like this:
http://www.dallasmidwest.com/Browse/Part...afid=nextag_dmw
Work?
I may try to build some type of thin wall on casters that I could roll back and forth (similar to the above but made just from wood). It will begin to be an aesthetics over function fight, however, as I would still want it to look good
I'll get back with some more crazy ideas once I'm sure I understand your suggestion.
And as to your other suggestion, I certainly will consider more bass trapping in the wall/floor joints - so far this is just step 1.
Thanks!
Jeff
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#1937165 - 05/05/08 07:54 AM
Re: My theater / acoustic design plans
[Re: jeffro]
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Ethan Winer
MP Hall of Fame Member
Registered: 06/12/00
Posts: 5227
Loc: New Milford, CT, USA
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Yes, though I meant for the red wall to be to the left a little, inline with the closet. But what you show is okay.
Right behind that is the staircase
Ah, I missed that. Never mind. 
I am not sure how long I'll be living here.
More reason to not do much in the way of construction. Again, I'm a big fan of cardboard. I know it sounds lame as a wall material, but it reflects mids and highs and passes bass, so it offers a lot of possibilities.
I assume it is important that whatever I build be flat and parallel to the wall on the left?
What matters most is symmetry. If one side is angled, the other should be too. And likewise for flat walls.
Sure, but these walls look to be at reflection points, so you'll need to treat them.
--Ethan
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