Real traps behind Summits
Behind the Summits to absorb the back wave or bass or both? 4" thick with a few inches of gap between the trap and the wall will absorb well into the bass region. If you're trying to also cover as much of the lower bass as possible, go for the 6". 4'9" on the stand should be plenty tall. Too tall and, IME, you start to overabsorb and lose actually helpful reflections which provide ambiance.
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See this is where I get confused . . .
If the panels are at least 5 feet from the front wall, which mine are (or will be in the finished basement), my question is it better to have a free standing panel a foot or so directly behind the Summits woofer case (need space to clear the power cord and speaker cables) OR to have the panel 4" off the wall as real Traps suggests? Is a single 2' X 4' trap, 5' from the panel going to be enough absorption, or will I need two pannels on the wall?
Reason for the stand idea is to raise the panel 6" - 8" off the floor, thus allowing the downwrad firing base cone to be free of "obstruction". Maybe a better "pattern" as I believe the manual shows the base radiating outward from beneath, like a pebble in the water. This way, I am only absorbing the panel.
So . . . better to have the panel(s) on the wall or behind the woofer case, closer to the panel? In each case which thickness should I use, the 4'-1/4" or the 6"? Either way I would use the HF version to absorb the mids and highs.
Right now I am looking at three options . . . Real Traps, GIK and ASC Tube traps (another animal altogether, more expensive and must be at leat 2' behind the woofer case again due to wires). I see a lot on the site about all three and am studying up