Stereo amplifier for a pair of passive subwoofers.

Thanks.

Ok, this is what I found available under $400:

Acurus A200 ...........$400.00
Hafler DH-200 .......... 225.00
Rotel RB-980BX (2)........ 295.00 and 325.00
Hafler 9300 Trans Nova .. 375.00
Acurus A150 ................325.00
Parasound HCa-1200 .... 375.00
Hafler DH-220 ............. 200.00
Acurus A250 ................$400
B&K ST1400 .................250.00
Muse Model 100 ...........400.00
Hafler XL-280 Excelinear ...350.00

What should I consider?

Well, everyone agreed on the Bryston units and I know these are tremendous amplifiers. Their 20 years warranty is incredible, although they last longer than that !!! The problem is, every unit ( except from EBay) seems to be around $700 or more. In which case, I would buy a SVS or Hsu subwoofer to pair my existing speakers ( Madisound Geminies- Dynaudio clones).

My mistake was not to mention my initial thinking. My stereo speakers consist of a pair enclosures where the highs/mids are on the top box and the bass driver is in the lower box. Since I could use them as passive woofers, I thought I could buy an under $400 amplifier and use it as a sub-amplifier. This way I could use my top boxes ( which extend to around 50Hz) as small and use the bass boxes to reproduce the lower frequencies.

My room has around 5,500sqf and a single subwoofer seems to be short for the space. With the towers using both drivers, I could fill the room better. An used amplifier looks like my economic alternative or buying a big sub from SVS, Hsu or Velodyne...which cost way more and shipping will set me another $150+ for one and double for two ( the avarage cost of a used amplifier).

I still love the idea of a Bryston but, unless I find one good deal, is out of my range...$$$

Gracias all :)