yes that is the very thing to which i was referring. by 2ch or 4ch i meant the rca preouts in the back. i have seen two "holes" in the back where i assume one would plug in the empeg and i also assume that those are the aux inputs. you are right, i have never seen four. i am a bit confused as to the difference btwn. preamp outputs and rca output and where the empeg would plug in. if anyone can clarify this, i would be grateful. i realize this maybe a novice question.