I also used to power my 3.6's with an Aragon 4004 MkII, but I upgraded to Krell and what a difference! My Aragon never seemed to let the Thiels open up; They sounded strained and congested except at low volume levels. The Krell has fixed my problem. I am in love with my 6 year old 3.6's again.
I've not found my Krell pre/amp by themselves to be a major source of harsh or bright qualities. Rather, the front end of the system seems to be very important. Bright sounding CD players (all too common these days) really sound bad with the 3.6's regardless of pre/amp.
I've not found my Krell pre/amp by themselves to be a major source of harsh or bright qualities. Rather, the front end of the system seems to be very important. Bright sounding CD players (all too common these days) really sound bad with the 3.6's regardless of pre/amp.