None! Get a SET and some Horning Speakers!
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The H2O monoblock amps from Henry Ho in Virginia may be worth checking into. I spoke to the designer and he claims they sound better than the JC-1's. Mr. Ho was formerly a designer of very good class-A solid-state amps. I know the power supply in his H2O amp is analogue. He says it makes for higher sound quality.
I'm presently evaluating the PS Audio GCC-250 amp that uses PS's new Gain Cell technology for the input stage and an SDAT Class-D amp for the output stage. I hooked it up yesterday and my initial impressions are very favorable. Dynamics are quite good and it has the ability to keep all the instruments clear within its large soundstage under high-drive conditions with complex recordings.
Henry knows his H2O has gone up against the JC-1. One thing to remember, the JC-1 hangs on to a class A rating only to the 25th watt. My former Pass X600 was good for the first 150 watts.
The H2O puts out 45 amp. of current. That is considerably more than most other amps. I have heard digital power supply ICE based amps, and they are not to my liking. To my hearing, Henry's amps have more solidity, and deep depth.
I'm running his $5500 Signature monos on 1 ohm Scintillas. Everyday I get a WOW factor. That's because of the exquisite music recorded. I get to hear it in all it's glory.
I use to yawn at classical quartet recordings. Not because I don't like them. I have been to scores of live classical events. Now, thanks to H2O, I can hear all the subtle bow turns that breath life into every note. I am buying every well recorded quartet disc I can find.
H2o Signature Mono's very precise and accurate regarding inner detail. If you are seriously considering a new amp, give Henry a call and talk to him about his "loaner" stereo amp... it will at least give you an idea of what the "entry level" $2500 unit will do in your system, your room, with your ears. Best audition one can ask for...