Carver Raven 350 Amps

I have the Crimson 350's, used them to power my Ulfberht speakers. Very nice tube amps, but I went with BHK 300's for more power. The Carvers are an interesting design that run the tubes very cool, they only get lukewarm even after hours of use. They have adjustable feedback to change the tone of the amp, from a more solid-state sound to a more traditional "tubey" sound.
If I did not need the extra watts in my setup, I would have stuck with the Carvers.

My listening room absorbs sound like a sponge, so I have to crank up the volume quite a bit to get the concert-hall levels that I like. The Carvers sound great, but would run out of gas before getting to those levels. The BHKs have no problem with this. In terms of sound quality, the amps are pretty much even, with the Carvers having a bit more sweetness in the midrange.

The Ulfberhts are sensitve speakers but they do enjoy being hooked to powerful amps. Bass does indeed benefit from this. They take on an effortless quality when driven by large amps.