Stereo amplifier for a pair of passive subwoofers.

You have a great number of options in this price range if you buy used. Everything mentioned above has potential. You might also want to consider a pair of Marantz monoblocks for around $300 used. If you want to try Hafler, let me know. I have one that I was planning on listing shortly. Have fun with your search.

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?

How about a used Carver ZR series amplifier. These babies really have great control over the woofers. Or maybe even a Peavey GPS series . Both amplifiers are absolute work horses.

Good Luck!

The trouble with inexpensive amplifiers for subwoofers is that they tend to be deficient in exactly places where you need them to be strong: power rating and/or power supply. Big transformers and big capacitors are expensive so that's usually where the cost cutting takes place for inexpensive amps--high power rating don't help much with puny power supply.

You may want to consider finding an inexpensive class-D switching amps using 250-watt or 500-watt ICE modules or similar modules. They don't require large power supply and the inexpensive one don't sound good in the mid and high frequencies but you don't care about that. The bass will be the best that you can get out of solid-state amps.

Unfortunately, I am not familiar with the many small manufacturers that make these amps inexpensively. But I think it is well worth your time to look for them.

A lot depends on the subs used as far as how much power your going to need. My power meters on the front of my Onkyo M-504 very rarly hit peaks of over 100 watts driving two vmps subs.

Most of the time the Onkyo is coasting along at well under 100 watts...more power would be nothing but a waste of good money.

I should mention also that this is in a large room.

Dave