My experience with Parasound and Richard Schram specifically has been first rate. I have a JC-2 preamp and JC-3 phono stage. The JC-2 opened the sound of my Sony XA5400ES compared to its sound through a Cary Cinema 11a, especially when playing DSD. I was as though a veil was lifted. And the JC-2 with the Ayre C-5xeMP achieves a naturalness of sound I've never experienced before. Finally, whatever magic Parasound uses for its mono setting of the JC-3 really works: Previously unlistenable old mono vinyl become enjoyable.
My experience with Parasound almost makes me want to replace my Proceed HPA amps with JC-1s, but the HPA amps are obviously Levinson amps in an industrial case, and i have high regard for them.
Thorens TD 124, SME Series III arm with Ortofon SME 30 H cartridge into Parasound JC-3 phono stage
Ayre C-5xeMP, Oppo BDP-105, & Sony XA5400ES disc players
Parasound JC-2 preamp into Proceed HPA amps
KEF Reference 107/2 mains & 102 surrounds
Velodyne SMS-1 bass managers & a pair of HGS-15 subs