I just installed BassQ in my home theater last week. In short--it works. My room has 2 rows of 3 seats, and there was a large difference between the various seats, particularly between the rows. I have yet to install bass traps, and while I'm sure they will help (they are now on order), they would not solve the problem as well as BassQ + traps, I'm certain.
I did not want to buy several subs, so to test the BassQ theory, I first tried using the speakers I already have. The room modes are between 35 and 120 Hz in my room (11.5' x 17' x 8'), and the main L/R speakers and 4 surrounds each cover down to 30 Hz nicely. That's 6 mid-bass "subs" in effect, and then I also have a separate powered sub that goes <20Hz. Figured I had enough bass drive capability.
So I am crossing over all speakers at 100 Hz [update: 80 Hz] in the AV processor, and I tell it there's one Sub. Now I have one audio signal carrying all the bass. I feed it into the BassQ box. The 4 outputs are then distributed to the L/R and 4 surrounds (driving the Ls/Lb with one signal, and Rs/Rb with another, thus sharing the load). The front L/R are more capable speakers.
The diagram shows the signal path of the bass management system I'm using. It anticipates the use of an SSP-800 which has 2 sub outputs, but for now my processor has one sub out, so I use a Y splitter to drive the two paths. The resistor summers are in an aluminum box I made. Works great.
I also just received the XTZ Room Analyzer kit which helps see the before/after effect. The plots show blu and white curves. The blu are the measured results. The white show how it would look if the suggested PEQ filters were added.
Fig 1 shows the use of only the 4 "corner" speakers used as subs. The Ls/Rs are not running. The "front" graphs show the XTZ mic moved to 3 positions across the front row. The "rear" graphs show the same for the rear row of seats. You can see from Fig1 that BassQ helps make the two rows look more uniform.
I then added the Ls/Rs in parallel with the rears, and re-ran BassQ setup. The results are in Fig2.
These plots also show that the speakers all roll off below 25 Hz. So I added a bit of a high-pass filter from an analog Rane EQ to cut off below 30 Hz, and I added my main sub with a 30Hz LPF. I did not re-run BassQ, as the main sub is not in the BassQ signal path. Fig 3 shows the overall results.
Fig3 is what I'm listening to, and it sounds very good already. My room still has ringing at 80 Hz, causing a notch in the rear seats, so the bass traps ought to help knock that down. For ref, here's my room layout with the mic positions added:
I hope to hear from you or others who give BassQ a try.