The A21 is your weak link the JC 5 would be better, however the entire setup of preamp and amp would be bettered by moving into an uber integrated from Vitus, Gryphon or T+A.
The Vitus gear does tend to sound warm, which may not be a good thing with the Dynaudios, the Gryphon and T+A are both warm but not as warm as the Vitus gear.
Dave and Troy
Audio Doctor NJ
The Vitus gear does tend to sound warm, which may not be a good thing with the Dynaudios, the Gryphon and T+A are both warm but not as warm as the Vitus gear.
Dave and Troy
Audio Doctor NJ