Listened to your posts and it doesn't sound in the videos to be the same sound I have experienced. I'll try playing a few more times and see if I can pick up on the distortion

LFR1100
VP180HP
EP600
M3 In Ceiling x 4
M5OW
M2 - Atmos rears
ADA1500.5
M3 Outdoor Speakers
ADA 1000.8