Well the difference was really audible, so even with ears you tell if things are geting better, but the process is much much longer that way.I suppose, for me with no measuring equipment (well, except Spectroid ) I could (before Audyssey) with 80Hz crossover that is the point where the mains and subs would be both together and try an 80Hz test tone. Assume, using my Dobby ears, it will sound louder when phase on sub is closer to mains.
Thank you This has been a long time coming.John wow glad you have some nice bass at last. It’s all to do with integration and time aligning.
I have small driver MA apex and they sound awesome as centre channel so your q acoustics should be fine. Try fine tuning with slightly changing centre channel distance to see if they are getting better integrated with the subs
ALSO the drivers in Apex A40 are much larger than QA3090C. 2x140mm vs 2x100mm. Also Apex A40 are on a different class to 3090C