Looks like I am bit late with this post. Last winter I put a 3rd EP600 into my system in the back of the room and I started playing around with the x-over setting. I found quite a positive difference to the performance if I set the EP600 x-overs to 80 Hz; which is where I had processor x-over set for the center and surrounds. The low pass x-over in the processor is rated at 24 db per octave, which is reasonably steep, but the x-over in the EP600 sub is a “brick wall” IIR filter. So at 80Hz the sub is playing full volume but by 96 Hz it is 24 db down. I think it is worth checking this out; it would be interesting to hear if anyone experiences the same positive results to the performance that I had.
