I would consider McCormack DNA 1 Check out review in stereophile. I have owned one for 3 years and love it
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See my ad for Kinergetics KBA 75. I own a hi-end company www.audiotweakers.com. This amp has been in my personal stash for 4-5 years. With the right complimentary equipment it competes with anything. Retail $1995, plus $300 power supply mod- sell $995 OBM. Pure Class A doubles down to 300 w@2 ohms. Weighs 50 pounds. FIrst class all the way.
to improve your 555II, try something like an arc preamp. i substituted a sp3a-1 for the 565 and the whole thing opened up. dynamics espewcially. tubes in front of adcoms are highly recommended as far as im concerned. my friend use a counterpoint pre and the results are very nice, and this is with ml requests. ive been warned that adcoms are too bright for MLs but that is crap. borrow an arc if you can, you may not buy another amp......
MUSE SIGNATURE SERIES II MODEL 175 & MODEL 300 Monoblocks would be excellent choice for your application. The 300's output: 300W, 8 ohms, 500W, 4 ohm. with Output Current Capability 70A Max. The 300's were designed to cope with the requirements of modern low efficiency loudspeakers with their demand for large output voltage swings. The MUSE 175's Output: 175W, 8 ohms - 325W, 4 ohms - 550W, 2ohms. with Output Current Capability 90A Max. Frequency Response for both: -3db at 13Hz and 250 kHz. The 175's have been optimized for low to very low impedance loads and can handle the most difficult loudspeakers. For any system that dictates unshakable current capability and absolute load stability, the 175 or 300 Mono Blocks are up there with the best, WITH NO EXCEPTIONS. Both list in the $3,500 - $4,000 range, probably out there somewhere in the used market in your price range.