I currently have two Lexicon 501 (they are actually Bryston 7B's made for Lexicon with their logo on them) amps. They are 800watt mono-blocks. I paid quite a bit for them, almost $3,000 used. If I could sell these on the bay, and pick up a couple of Nakamichi PA7's instead (about 6-800 a piece), would I get the sound quality I have become accustomed to with the Bryston? They sound excellent, but I've heard the PA7's are great as well. The PA7's are not monoblock circuitry...is the monoblock design better sound quality?