Subwoofers... if there is a rarer phrase than "I have too much subwoofer" in audiophilia, I have not heard it. It ranks up there with "That kangaroo has my blender again". There's a very good reason for this exceptional rarity- you can never have too much sub. Accordingly. I submit for your perusal the (almost) 1 kilowatt, Dayton SA1000 stand-alone subwoofer amplifier
The Facts, Kangaroo Man, Just The Facts
The SA1000 is a very powerful amplifier with just shy of 1,000W into 4 ohms, with typical content (one third duty cycle, meaning, it won't do a continual sine wave, but will whump along with music plenty well). While we normally might see this specification as a bad thing, it's really not a major limitation- bass tends to come in short bursts. Power consumption is minimal due to a sliding rail power supply scheme, it's only 24W at idle. I have not yet been able to make it get hot (which it most certainly would, if you were driving a few hundred watts RMS). Build quality is excellent, and its black minimalist styling with internal heatsinks suits most systems fairly well, it's not an eyesore nor a work of art. Packaging was very good, with large foam spacers inside the shipping box. It has 2 pairs of high quality insulated binding posts, small pop-out knobs and switches for adjustments, and RCA in and out (with a 12dB/80Hz highpass on the output).
For Those About To Thump: We Salute You!
Of course, that much sub deserves a lot of amp. I tried a few smallish amps, as well as a Reckhorn A403. The smallish amps (150W range) didn't have the cojones, and the Reckhorn was a disappointment- somewhat timid sound, and 2 units I had both developed a fuse blowing problem. The Dayton SA1000 is not timid. It has not given me any trouble in the couple months I've had it. The feature set is impressive and useful and I have no complaints thus far. In short, this is the finest sub amplifier I've had the pleasure of working with.
The SA1000 is in control of the woofers. It's a good match from an output perspective, as it can squeeze everything the trio12s have out, before running out of power. This is an issue because the trios, as with the overwhelming majority of sub drivers, are not very sensitive. I can readily achieve unhealthy SPLs with both the amp and the woofers loafing along. The performance of this combo is amongst the finest bass I've ever heard. Other contenders would be one of the older Gradient models I heard at a show (dipole 10"s, it was exceptionally clean and well defined), Edgarhorn Titans with Seismic sub (GOOD stuff), and my own minimal baffle dipoles (old, undocumented project) which had a quad of peerless 8" woofers per side, and 10" vented sonosubs (one per side) backing them up.
I expect a great deal of clean, well defined bass from a subwoofer. Thumpy one-note nonsense need not apply, nor should tiny woofers be used with huge amps (a la Sunfire). The SA1000 driving my pair of Trios does not disappoint- pitch definition and the ability to follow the instruments playing in the sub range are both excellent, to go along with truly massive dynamics. This combo is equally at home adding spaciousness to a harpsichord recording or providing explosions and bone crunching sound effects for HT applications.
The Important Paragraph