Not to be a party pooper, but fixing a sub’s response for any one listening point in the room doesn’t “fix” the whole room.

Let’s suppose that at point “A” standing waves in the room provide a +6db constructive boost at 48Hz while at 32Hz providing destructive canceling by about -6db at that same point “A.” At point “B,” about 2 meters away at another seating position, the opposite occurs boosting 32Hz and suppressing 48Hz. Now using some form of detection at point “A” the user determines automatically or manually that some portion of the electronics should reduce the signal by -6db at 48Hz and boost the signal by +6db at 32Hz. A listener at point “A” now hears a “flatter, more even” response but the situation at listening point “B” is now twice as bad as it was before the measuring and adjusting.

Even the most perfect sub or system EQ done from only one measurement point means that the listener must plug one ear and locate the other at precisely the point the measurements were made to really hear every bit of the improvement. If the same frequencies are either over or under represented by the nearly the same amount at all listening points in the room, a simple one point EQ measuring and adjustment would be great.