Posted by Wayne Parham [ 70.128.109.81 ] on April 15, 2009 at 12:26:12:

In Reply to: Subwoofer placing behind the listening position? posted by Champion on April 15, 2009 at 06:31:16:

Sub placement(s) behind the listening position are often justified, in addition to closer flanking subs. Naturally, the amplitude and low-pass frequency of the more distant subs will need to be adjusted so they cannot be detected as separate sound sources.

I find that subs placed closer to the mains can be low-passed higher and can also have higher amplitude. Those are what I call flanking subs because of their position in relation to the mains. With higher low-pass, they tend to smooth the upper modal region.

The more distant subs are necessarily low-passed at a lower frequency. They tend to smooth the lower modal range.

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