Originally Posted by kromkamp
No, I don't think so - those diagrams are illustrations for Section 4 "Standard Positional Optimization of Multiple Subwoofers in Rectangular Rooms". As far as I can tell, this is before any phase adjustment or DSP of any kind.
Agreed, Section 4 appears only to be about optimal locations for 1-4 subs.
"By analyzing over 100 000 subwoofer configurations it was shown that for configurations of one to four subwoofers, location at wall midpoints is optimal."
The subsequent sections (5 & 6) detail further optimization with DSP. Needless to say I am still absorbing those details
So in other words it looks like DSP adjustment is non-trivial and not exactly laid out in detail. ;-)
Section 5 is: OPTIMIZATION OF MULTIPLE SUBWOOFERS USING HIGH-ORDER FILTERS
"The optimization of multiple subwoofers for multiple seating locations in real rooms has often been approached by using high-order FIR filters for each subwoofer. The following discussion assumes linearity and time invariance in the properties of the multiple-source multiple receiver system."
This sounds like just about anything. ;-)
Section 6 is: OPTIMIZATION OF MULTIPLE SUBWOOFERS USING MINIMAL SIGNAL PROCESSING
"Simple signal processing is available (some combination of a single biquad filter for each subwoofer, signal delay, and amplitude control). Filters are not arbitrary, but are from a set of simple IIR filters such as might be available on a relatively low-cost commercial DSP box, or incorporated into an active subwoofer."
That sounds like a switch and two variable control (3 controls). Still a lot to optimize manually by means of twist and test especially with 2 or 4 subwoofers, each with its own set of 3 controls.