gja, glad you got things figured out. While corner placement is generally preferred, I moved my primary sub a third of the way down a side wall. By itself, I got better measurements vs. the corner. Subsequently I added two more subs to get an even better in room response. Plus, I've always felt one sub to be somewhat localizable.

There are so many variable in sub placement it can drive a person mad!

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"Nothin' up my sleeve. . ." --Bullwinkle J. Moose