ATCs do not lack bass. Seriously do not lack bass. A 6" woofer isn't going to give you what an 8" or 10" could, but that's not ATC's fault. I have the passive ATC SCM12 Pro's -- these have the same drivers as the SCM19s (passive or powered) with 12 liters internal volume vs 19 liters. And these things pound in the bass down to ~50 Hz. They're sealed/acoustic suspension, so consider ~50 Hz a hard stop. But I typically use them with a sub to fill in below, and the sound is very impressive.