The Fun is tremendeously neutral and transparent amp. It adds no coloration, it doesn’t manipulate the sound in any way, it doesn’t sound euphonic, nor bright, neither analytic nor warm. It is like looking through the cleanest window. After connecting a range of sources there was always the same feeling, the fascinating cleanness and neutrality. The Fun is a stellar performer deserving clear 5 stars. Already in the basic version it is a bang for buck. Adding Burson’s V6 Vivid or Classic opamps transforms it to even higher league. Mine will continue singing with the V6 Classics.