My buddy owns the 5SE and has a dealer demo ARC 6. In his system, I have a VERY hard time telling the difference between the two pre-amps. Perhaps a longer time with each would reveal the subtleties. He loves his 5SE and was hoping for more of the same from the 6, but "so far", he cannot justify the change. His Dealer is now suggesting the Ref 10.
Audio Research Ref 10 vs 40th Anniversary preamp
I was wondering what the difference in the sound between the Ref 10 and the 40th ? Not much wrote about that. I btw have the Ref 6 but never heard the 10 or the 40th.