Thanks Amir for measuring this amp. While it's performance is less than I had hoped, I'm enjoying a pair of these in dual mono mode. Yes, both the sub and the mains can be filtered but only at a single point, about 100Hz. I think 24db/octave, works well for my Kef LS50s and REL HT1205, but have not tried other combos. While I still think they're a good sounding deal for bridgeable powerful compact amps, I'll certainly reference this review before recommending to others. Thanks!