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Wow, this is a great forum. I'm learning more about room acoustics than I ever thought I'd know! Just got back from Ethan's webpage. Amazing amount of stuff there.
My first project is sorta weird for a number of reasons. Due to the rather strange traits of my system, I'll give a little background: I run direct drive Acoustat loudspeakers. I have specific amplifiers (Acoustat Servos) that deliver 5,000 volts at their output. I have found that my system performs better when I get the amps out of the room. There are a number of reasons for this, but I think eliminating some mechanical noise from the room (transformer hum, etc.) helps, and I also suspect that something in the amps might be microphonic. Either way, it sounds better. The good news is that, at 5000 volts, I can run extremely long speaker wires. Basically I use the same wire that is used on the stator grids of the panel - 10,000 volt 100% tested wire with a vacuum-drawn PVC coating. There seems to be no sonic penalty to even a 50-60' run of this speaker wire. One caveat, though... the wire must be spaced. There are five wires per speaker, and I space them at about 3" between conductors. My room will be 17' long, 11' wide, and 7.5' tall.
Okay, now on to my project. My amps are going to sit in an equipment closet at one end of the room, and the speakers need to be on the other end of the room. Thus, I need to run speaker cable across the long length of the room. My plan is to build some deep bass traps as described on Ethan's page, and use them as a conduit for the wires as well. I am modeling this after the top diagram here:
http://www.ethanwiner.com/BTPlans.gif
So... I will be building a deep bass trap that attaches to the ceiling and runs the entire long length of the room. It'll be 2' wide and 17' long, dead center in the ceiling. I plan to make it deeper than the plans show to allow the wires to be surrounded by as much air as possible. I will use 2x4s instead of 2x2s, attached to the ceiling with toggles and caulking. The frame will be 1x6s and the face board will be 1/4" plywood. Inside will be cross members that have holes in them for the wire to pass through. It'll be glued in place.
My main questions are:
1) Does this seem like a good plan from a sound treatment standpoint?
2) Should I build one of these in the center of the room or two running along the ceiling/wall interfaces?
3) Should I put any other treatment on the face of these? Since it is generally accepted that an absorbing ceiling is good, I am concerned about the plywood that will be the finish for this trap.
4) Should I go ahead and build the other traps all along the ceiling or should I put something like the 703/cloth trap described in the link above on most of the ceiling?
Thanks in advance for any suggestions!
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