Just saw Dub Trio in NYC and I stood directly in front of the bassist and the FOH subwoofer was at my feet. The sub flapped my pants for the whole set, but I simply could not discreetly hear the bass rig (from 10 ft away). Stu used an Aguilar GS412 cab with AG500 head. The mains were slightly behind my right shoulder. The subs looked like 2x15's and their were two- one at each end of the stage. The only time Stu's rig became discernable was when he engaged overdrive as I could hear the high-end, trebley grind. More often than not, I experience the same phenomenon in most small-medium sized clubs. Is it possible that there is a phasing issue between the stage rig and the subs that cancels out the low frequencies? Or could it be that the bass rig simply can't compete with the subs.