And also, remember that the M1.5ts is one of the few Carver amps that cannot be bridge mono (that I know of).
The M-500t should do OK, and a Sunfire 2-channel Signature runs 600 wats into 8ohm, so it should drive the ALS just fine. I have a pair of Martin Logan Sequels, which are notorious for presenting troublesome loads (can dip as low as 2 ohms with some music). I used to drive them with a pair of Silver 7ts, and the sounded beautiful, and only got warm when played certain CDs (most notibly, Telarcs DDD recording of the 1812 Orchestra, Pink Floyd's The wall on MFSL gold discs, and interestingly enough, some Kate Bush...)
Now my Sequels are in storage, because a few years ago, I sold off most of my other gear. But I'm slowly rebuilding my system, and hope to have everything up and running by New Years. I reecently got a minty C-4000t (with original box and manual) from a guy in NC, and now I'm looking for amps. Probably going to go with a pair of M-4.0t's bridged mono, unless I can find a good deal on some Silver 7/9ts.
I am also planning to take my system to the Home theater level, and purchase some sort of Martin Logan center speaker, so I'll need to try and match the sonic signature of whatever amp I use for the main speakers. Because of this I'm leaning toward the M-4.0t or the M-500t, because it would be easier to get three of those amps (bridged mono) than to find 3 Silver7/9ts. Or I may go nuts and try and find 3 Sunfire stereo amps and bridge them. (that would be just insane)
I'll probably go with a Lexicon processor. I haven't been impressed with the Carvers (DPL-33 or DPL-20). I used to have a C-20v, and it was always a little hashy in the rear channels...
Judging from the coments of other posters on here, I'm going to stay away from the smaller Carvers, like the M-400 or the M-1.0. I imagine with the load presented by Martin Logan speakers, dipping into sub-4-ohm territiry would result in a rack full of smoking metal boxes...
Anyone have any suggestions/comments???