The 332 opened up the highs a lot, where it was a little rolled off before. I have Martin Logan Ascent, I assume the better performance in to 2 ohms loads is responsible for this? Before the 332 I really had to crank the HPA to get it to liven up. The proceed is no slouch though, it seems to have endless power.
The amp had not been used for several years before I purchased and re capped. It sounded great just out of the gate, but really took a few months to sound "right".