Quote Originally Posted by Florian
The problem aint speed, its resolution ;-) 20Hz will always be 20Hz, there is no slow or fast. The problem is the resolution, room, phase etc... Try some new Velodynes with the room correction software, use two in stereo :-)
While two incorrectly placed and calibrated subs can be awful, two (or four) subs properly deployed will add fantastic resolution, clarity, and quickness. They won't always be phased alike to have maximum effect. By "effect" I'm not referring to boominess or loud thumping; I'm writing about smooth, quick, effortless LF reproduction in a specific room.

I guess I'm an advocate of the "many hands make light work" school of thought when it comes to deep bass. Of course, it helps to have reasonably big hands, though not necessarily monstrous ones, unless the room is large enough to require them.