Let's assume it will drive two way speakers with 1" tweeter and 8" woofer, 89db 8ohm. Any price level. No hybrids invited. I personally haven't heard of one.
vote 2 for Air Tight products ... I have the "Acoustic Masterpiece" M101. Only 8w but great bass even compared with my 200w/ch Lyngdorf SS integrated into 89db 2way floorstanders
I will add that some 845 tube based amps will also give excellent with less efficient speakers - the Viva Solista and Mastersound Compact 845 are the only two I have used at home.
I think the key to Air Tight amplifiers great bass lies in their choice of transformers
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