Cary,

I have the 563As,($70.00)orignal list was around $500.00,which was replaced by the 578As. The 563 has channel level adjustments as I described in my post. I just assumed that since they look exactly alike, and the 563As was discounted by Best Buy when the 578As arrived,that the level adjustment would be included in the 578As. BTW, I use Soundhound,s Sub Configuration and like it very much.