GREAT feedback from all and thank you!!! Quite surprisingly I get "undefined" bass with the Classe amp but "deep tight bass" with the ARC amp. I also thought it would be the Classe that would give me the bass but it was the ARC that had the "tight" bass drum and low bass guitar and the Classe was not as deep and the bass drum sounded fat. I could be describing a 'thin' sound from Classe. And youre correct MrTennis on each definition of "tube" sound. The tubes I have auditioned had what I describe as tight control of the bass and mids but were soft on the highs. Certain passages in the music sounded as it had moved to the background and in the front as it should be. Now that is my interpretation of the tubes I have heard. And 6550c, no offense taken, some have suggested going to Maggies to eliminate the crossover that might play a role in not giving me the sound I want but I dont want to have to think about a sub for them. My music is a mix of new age, jazz, contemporary and some pop, so you can see that I want some deepness to the bass. Again, thanks to all! The search continues with you alls help!