Tai, something is wrong here. You claim to have gotten great bass driving Thiel 7.2's with a 60 watt BAT tube amp whilw getting little bass with Pass X600's? I think not! How did you drive the Thiels, which have only 86db sensitivity with the 60 watt tube amp? Something is not kosher here.
Where s the bass?
My system - Sony CD player, Pass Labs X0 preamp & X600 amps, Thiel 7.2 and Transparent Reference cables. I believe the sound is open, transparent, and dynamics. However I just wish I could put an emphasis on the bottom end. Tone controls are not available on high quality Class A preamps, such as the X0. While I understand that adding one more component in the signal paths is not desirable as it will further degrade the sound, I would like to hear your opinions on the best way to boost the bottom end. Thank you.