Great response to this thread! I have 6 subwoofers - 4 in-wall RBH SI-1212/R9 (dual 12") and 2 REL HT1510 (15"), all sealed. I have used SVS, PSA, MSO, miniDSP, REW, etc., in the past, but currently using Trinnov's WaveForming with 3 subs at front wall (2 inwalls and REL on floor below the...