John, it is indeed an SW1. Not deep, but used to be nice and tight, back when I ran the speakers through the sub. In that setup, the amps were bridged to provide 180 watts per channel. I wanted to try this new setup for two reasons:
1. My amps aren't perfectly matched, so I thought this might help balance the left and right channels.
2. I wanted to try biamping, even if it meant dropping to 60 watts per channel (still loud enough for my tiny living room).
The result is that the mid and upper region sound better, and the bass sounds awful. REALLY awful--even my girlfriend complained about it.
It sounds like one solution might be a passive crossover before the amps--marchand actually sells one, but it is super expensive (like 400 bucks!!).