As above,Optimal Enchantment (great name for an Audio shop) is a Hallmark for retail brick-and-mortar that has been around for a long time. I can remember their ads in Stereophile / TAS back in the 1990's. Good to read that these guys are alive and well.Happy Listening!
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.