Better late than never as they say, Mike. I picked up a Denon X8500H some time ago, instead of the X6700H, seemed to offer some more versatility but lacks the handy pre-sets on the X6700H. I can live with that though and instead load an Atmos or Auro-3D speaker configuration with the phone app or USB and wait a minute. So far I'm happy with it. It's time to get started with some measurements with Audessy + REW.
For me the front + rear subs are "only" to get an even bass response across the room with a CABS / DBA sub positioning. As it is, with front + rear subs hooked up in phase, from left to right in the room, the response in REW is very even from 20-140 Hz, 92 +/-2 dB with about 1 watt to each sub array and without any EQ or time delays applied. There's a huge bump 40 Hz though as long as no time delay is applied to the rear subs. Still, the bump is not very noticeable as the T60 decay is around 430 ms at 40 Hz and around 230 ms for the rest of the range. From 20 Hz down to 10 Hz the response rises to about 100 dB with about 1 watt, due to room and pressure gain. (So, what I'm implying is that very large rear subs may not be necessary to smooth out the bass. Actually one might end up with a lower total SPL in the bass with front + rear subs but a better sounding bass.)
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