What to use as a subwoofer amp

Since 1981 I have been using stereo subs. First of course with passive subs and then subs with internal power. Phase Linear 400 and 700 at that time where both ill defined and proved to be unstable. Dynaco 400 and SAE 3cm where much the better amps designed by John Bongorno, later of Great American Sound. The relativley small Apt Holman amp designed by Mr.THX himself proved to be a huge improvement over the much larger and more supposedly powerfull Phase Linear stuff. Apt was able to play louder and was more stable and tunefull at the same time. Last external power amp I used was a Krell Ksa150. Each of the two channels driving three 10in woofers. This was a 1.8 ohm load and was no problem at all for the Krell. This impedance load allowed the Krell to produce over 600 watts of true class A power. The Krell was the most tunefull of many amps I had used to power passive subs. First and foremost look for an amp that is stable with both low impedance and reactive loads, as well as having no current limiting. Remember rated power is not always what is claimed. If you cannot go the Krell go Bryston. The Bryston will exert much more control over a large and unruly moving object such as a subwoofer than will a noisy and unstable Phuzz Linear. Tom

Aragon amps should also be added to your list of high value high impact sub amps.. Tom