So, this weekend I decided to stop playing with set-up options and just enjoy the A8A. I’m very pleased with it. No issues, just good sound. I’ve also left Surround AI on and been impressed by it. Based on by what I’ve heard, it may stay on indefinitely. I will say the YAPO has most certainly handled my sub set-up with a lot more finesse than my Denon did, but given that the 4520CI was 8 years old, that could simply be due to advancements in the technology. My bass response is smooth, not boomy. It’s there, I feel it in my feet when I’m meant to, but it no longer rattles the light fixtures.