Does a subwoofer amplifer exist?

If you really can't find a stand alone amplifier for your sub, take a look at the ones that manufacturers send with their subs. For example, I know that Velodyne used to have a model that came with an external amplifier. You can sometimes find them for sale on ebay, more so than on audiogon. Also, you could use a regular two channel amplifier in bridge mode, and buy the Paradigm X-30 crossover to go with it?

Check HSU.

Gallo just released their Reference SA. (www.roundsound.com).

It can be used to set:
x-over
boost (through an eq function & stereo volume)
phase

hsu,nht,dbx,m&k,all 4 of these manufacturers make subwoofer amps for passive subs.

mike.

Thanks, good references.