If I bought one of these, I would like to connect (simultaneously) the high-level inputs to my main speakers (integrating them with the gain and frequency controls) and the low-level input to the amp's LFE channel (letting the amp, not the sub do the frequency filtering).
As far as I can tell, the SW3 has separate volume/gain controls for the high-level and low-level inputs. However, does it have separate frequency crossover controls? If it only has one, does this affect (i) both high- and low-level inputs or (ii) the high-level inputs only?
Physa - could this be related to your low-level input question?