I have Benchmark AHB2. It is powerful, dynamic and very clean with great treble and bass extensions. It has only XLR input, since Benchmark believes that S/N at this level (132dB) is wasted with single ended RCA connection. Also, it is extremely revealing and neutral sounding, but don't expect any added warmth.
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This class D amp seems to be making lots of waves lately. It’s "Pro" equipment but being used in home audio also. Huge power at a minimal price. I don’t know much about it but there are some youtube videos out there.
Audio Video Therapy in Nashua NH carries Gato. I heard the 4004 many times. Excellent sound. Originally Michael Kelly of Aerial Acoustics was the distributor for Gato. He really likes the way the Gato’s match up w/his Aerial line. I would call John the owner and set up an appointment . You’ll probably will be able to borrow the amp for a home demo.
I had one of the Crown XLS1500 amps. Good inexpensive sound for HT and pro use. To me it was unrefined on the high end and noisy in my 2 channel rig. I have had a number digital amps in my system and can highly recommend the Digital Amplifier Company (DAC) 2 Cherry. I use it along with the DAC DAC2HSV. The DAC DAC2 HSV is their Dac with a volume control and mates perfectly with the 2 Cherry. My speakers are 100db Charney Audio Companion horns. The DAC 2 Cherry offers a very detailed smooth sound with SET like midrange and articulate bass. I keep swapping it out with my upgraded ANK Interstage 300b SET mono blocks with upgraded ANK L3 preamp. I'm leaning hard towards the DAC gear since I don't think I'm missing out on the SET goodness the 300b amps provide. Fact is the bass is better defined with great highs and mids to match.
The DAC2 Cherry is Made In The USA and offers a 30 day no frills return policy if your not satisfied. You would be out shipping both ways but a small price to pay for the convenience.