I have been using a Pass X350.5 for three months. I have owne many amps over the years both solid state and tube. This is my all time favorite. It leaves so little sonic signature that it is amazing. It really makes me feel like I am listening to the source material with nothing in between. Compared to the X350? Better in every aspect. Bass, smoothness, musical timber etc. The .5 is a quantim leap forward that should be explored.
Richard
Richard