As much as I like the Concentra II--and I do--IMO if you can afford the upgrade, a Rowland power amp with a nice tube preamp will REALLY take you to the heights. I know we're talking much more $$ but such is my experience. I had Rowland Model 10 and initially mated it with Rowland Synergy II linestage and it was no good--I REALLY disliked the Synergy II sound. But when I put any of several good tube pres with the Model 10, oh my...that's the ticket. CAT Ultimate and Rowland amp is particularly ooh-la-la...