No sneering Please

I had a bit of an awakening recently. My office setup consists of Klipsch RP600M out in the room and Martin Logan 15i on the desktop. I have a Nakamichi TA-2A receiver (the Nelson Pass STASIS model) powering both. On a whim, I replaced the Nak with the Fosi V3 (with 4562 opamps) and was immediately taken aback by the lack of transparency, high frequency extension, and bass control exhibited by the Fosi. It also sounded like the music was much further away with less immediacy. I also tried the Aiyima A07 and it was better, but still nowhere near as good as the Nak.  Prior to this I was listening to the A07, A08 and the Fosi V3 in both my office setup and main system and thinking they were great sounding amps, so I was very surprised by what I heard.