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I am buying a house that has a semi-round room where the stereo will go. It is 20' in diameter with the back half open into great room (kitchen, dining, entry)--ceiling about 10'. Speakers will be in front half with back wall and right side wall part of the circle. Any thoughts on the acoustic challenges and treatments to remediate?
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I'm not clear from your post whether the circular wall is going to be behind the speakers or behind the listener.
In general round rooms are considered acoustically bad since the curved surface tends to focus reflections. That makes it hard to get a diffuse reflected sound field. It also means that there really is only on axial length for the wall to wall room modes, the diameter of the room, and that mode is going to be extremely strong. Some of those problems aren't going to be as bad in your room because it is only a half circle and open into another area.
I'd treat the early reflection points with absorption. You'll need to locate those with mirrors because of the constantly changing angle of the wall relative to the listening position. You will probably need to consider the points on the wall area behind the speakers as well as the ones on the side to the front of the speakers. You are going to need bass trapping, not only because of the standing waves but also because there's likely to be a lengthened reverberation time. There are no corners in which to place it so I'd place traps symmetrically around the wall and I'd go for a minimum of 4 floor to ceiling bass trap columns. I'd also consider adding diffusion in the form of something like the Argent Room Lens or clones, and placing as much of that around the walls as possible in order to try and generate a more diffuse soundfield than the room will naturally generate.
David Aiken
David, thanks for the reply...
The speakers will go against the round wall with it continuing half way to the right and a fireplace on the left. I worry about the lensing effect of the round walls and will be seeking to make them acoustically straight. I have several ASC Tubetraps and will no doubt add more. To add to the fun, there are 1'wide vertical windows spaced all around the curvature (about 4' on center so the traps, etc will need to go in between) which makes for great views visually and potentially a jumbled mess acoustically...
OK, a real challenge.
I'd keep the windows and try placing traps between some of them, panels at the first reflection points (may obstruct some of the windows but at least panels are movable so you can remove them when you want to impress the visitors), and try putting diffusors like the room lens between some of the other windows.
It may not be perfect but no room's perfect. I think with some work you can make it more than reasonable while keeping the views, and I happen to think that having a room that you're comfortable with is a plus anyway. I enjoy listening more when I'm relaxed and a relaxing room helps me relax. You've got to 'live' in the room while you're listening so it's worth having a space that you're comfortable in. That kind of comfort may only be a psychological factor, definitely not a psycho-acoustic factor, but we do have a psche and it's worth looking after it.
David Aiken
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