Interesting, 73Bruin…I've never heard much about the SB-2, but the SB-3, its big brother in the NHT line at that time (both were discontinued a few years ago), always came highly recommended. I've never matched either against the Classic Three, but I've read in more than one place that the Classic Three represented a fairly significant step beyond the SB-3. I'm currently using a sub with my Classic Threes, but the truth is that they'd be just fine without it. Just $.02…