Thanks a lot for your answers!
Originally Posted by tINY
I would set the gain on the active speakers down to the loudest you want to listen to it with the volume pot all the way up, this will reduce noise a bit.
Unfortunately the 800As don't have any volume control, but I'll get them matched anyway.
Originally Posted by PoorGlory
Your signal flow is correct, but if I were you, I would just Y the signal before the crossover. So basically, the crossover will just act as a low pass filter for the sub, and nothing will be connected to the high outputs of the X-over. This way, your naturally low-end deprived monitors will maintain their natural rolloff leaving you with the ability to rely less on the sub.
Sounds cool, but the 2 pairs of monitors are completely different rolloffs, so this won't work.
Thanks again, guys. I think I'll get it done thanks to your help.