Ok, I managed to borrow an Audyssey mic from my friend who has a Denon receiver but I confirmed that it is interchangeable with mine.
As soon as I started to do the Aud. calibration and it allowed my subs at lower gains to proceed I knew it was the issue and that my original mic was pooched. It was further confirmed on how my Fronts, Center and Top Middles were set to Full Band/Large once completed (which of course I then set to small).
So I carried on and below are some response curves of LF/RF/C of what Audyssey set (only change I made after Aud. before I took these measures was to set fronts & center to small).
Audyssey also set the speaker levels very differently than with the old mic.
However, as you can see the sub's volume was very low, so I raised it 6dB using the sub trim on the AVR (note: I did the 75dB test and determined after Aud, with the good mic, the result was now the opposite with all speakers around 78dB and the subs at about 72dB) I then started playing around with raising the individual speaker crossovers from the 40Hz it set it took once I set the speakers to small from large after Audyssey.
After trial and error, I determined that the following crossovers produced the best response (again, only by raising the crossovers)
Front 60Hz (up from 40Hz)
Center 80Hz (up from 40Hz)
Surround 60Hz (up from 40Hz)
Surr. Back 110Hz (untouched from Aud.) - likely higher because mounted lower on my ceiling causing some affect, not sure
Top Middle 60Hz (up from 40Hz) - didn't test, but just set to match surrounds
Finally, I started to tackle with my subs' PEQs that big crater around 30Hz, by setting both PEQs as follows:
31Hz, +3dB, Q:5.7
I posted here as well the comparisons between the first three (after aud calibration in red) compared to the end result after these adjustments.
I know I still have issues, and some may be resolved by moving the subs around, but my room is very challenging so not sure if I've improved to a point where I can leave that for another day
- my SVS PB12-Pluses are really heavy
Feedback very welcome!