They are not that much different at all. My friend still owns his and I and another friend both own the Master 1. I'm the only one in the group that uses ACSS through out though. My buddy with the Master 1 uses RCA output into the Audio GD SA 300 and it still sounds great. So I wouldn't lose sleep over it if I were you. When I get my amp back up and running I'll compare ACSS to the XLR, which is something I really have never done, and I'll send you a message about it.