If you skimp on the box volume, you will be dissapointed in the deep bass response. However, I have two 18A's, 16 cuft ABC boxes. They play really deep and they sound surprisingly nice. They don't have a lot of mechanical power handling, though. I have bottomed them out on normal music with a 100 watt amplifier. But they do get extremely loud in the process!

I can't call them my ideal choice for a home sub... But they're good.

I'll give you both in their enclosures (covered of course) for $750 :D

Adam