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tINY · 19th March 2010

If you place a speaker in the pressure anti-node (half-way between the two walls creating it), the mode is never excited. Think of it as the wave bouncing off of the walls and coming back to cancel itself out.

Turns out that you can do the same thing using two speakers placed 1/4 of the way between on either side as well. As a benefit with more subs, you also get rid of the comb-filtering-like boundary effects because there is more than one transmitter of the sound. You have to run them in mono, which usually isn't a problem below 120Hz or so.

The "subwoofers" article here is good:
Harman International - White Papers

-tINY

19th March 2010	#14
tINY Gear Guru Joined: Jul 2004 Location: Orygun Posts: 10,230	If you place a speaker in the pressure anti-node (half-way between the two walls creating it), the mode is never excited. Think of it as the wave bouncing off of the walls and coming back to cancel itself out. Turns out that you can do the same thing using two speakers placed 1/4 of the way between on either side as well. As a benefit with more subs, you also get rid of the comb-filtering-like boundary effects because there is more than one transmitter of the sound. You have to run them in mono, which usually isn't a problem below 120Hz or so. The "subwoofers" article here is good: Harman International - White Papers -tINY