Hey all, I decided to pick up an AU-999 for a solid price in order to upgrade my system from my Marantz 2220b that I recapped and serviced myself (it's a sweet sounding little unit, too!). This AU-999 is in great shape. It had one owner (he bought new), only has a few nicks on the edges, and the inside looks pristine. Even better, there's no noticeable noise from the speakers when I crank the volume all the way up, and the tone sounds great (it does sound a bit more bright on the top end than my Marantz, but that might be because of the subsonic filter -- I'll look into that later). My first question is... what's the best tactic to connect to an active [Rythmic] subwoofer that only accepts RCA and XLR inputs (and doesn't have outputs)? I have an external EQ that I've been playing with too. The tape 1 loop works just fine. But, obviously that's just a line out and doesn't have volume control for the sub. So, my first question is... why does my amp still have sound output from 'System A' when I pull the pre/main jumpers? Is the selector switch bypassing the jumpers? When I tried to use a Y-splitter out of pre-out and run that to the subwoofer, and the other back into Main in, I just get a subtle hum out of the subwoofer (as previously mentioned, speakers output regardless). I'm looking to make the recommended mods for the unit anyways, so I'm okay with doing a DIY mod for creating an ouput for the sub. I'm very excited to see this amp's potential! (P.S. does anyone know where I can get a red light bulb indicator for the Tuner source indication??) Thanks for the help!