The JC1 and A21 are designed by John curl and is a beautiful sounding amp! John also recommends silver fuses! I put a HiFi tunning Silver Star in my A21( on the main fuse line) and it took a nice performance leap into a new category. The XLR inputs do sound better than the rca and is recommended by Parasound they yield more refinement and and better sound stage!
hope this helps!
hope this helps!