Jeff,
I am using the Shanling SCD200 CDP outputs directly to the amps sans preamp. The Shanling has its own volume control, ranging from -99 to +2.5, with 0.5 increment on each step. I have listened to both SS and tube stages of this machine through headphones and decided to stick with tubes. When I had the stock ClariT, volume level needed to be maxed out quite often (0, +1.0, +2.0, +2.5), and I still wanted more.
After I moved to monoblocks with Black Gate caps, I found myself listening at -20s with more satisfaction. I guess it's either the increased "perceived" power and stereo separation thanks to monoblocking or the heightened clarity thanks to BG caps, or both.
Now that I have had the Auricaps upgraded for 5 working days, listening to the amps only a few hours a day, I am literally re-covering my CD library. Playing music at daytime while lying down in bed (the setup is in my fairly large bedroom - don't laugh!!), with certainty that no one else in the house, I found myself sitting up, looking around, wondering if someone coming home or there's any burglar.
A quick STOP on the remote control told me all. The culprit was the sound coming from the system I was playing. And I am taking about very conventional, non audiophile CDs that I had been not impressed with, either sonically or musically. Now they're just the opposite. The spookiness effect doesn't take place with every CD, mind you, but it tends to happen with either more complex music like orchestral ones or pure recordings. I think it has to do with the increased resolution, broader bandwidth, more extended ends, clearer midrange, or all of those.
I would send the stock ClariT or Teac or both for upgrades. Once you hear them on steroids your uncertainty will be swept out forever.
Dan,
The above said, I would probably try the mod Teac for a second amp, just to taste the bass grip that Jeff has experienced. Until then, I will continue to enjoy the little monos that never stop to impress me with their ability to grip the FTA2000s and the delicious highs. However, I also trust the Maestro Vinnie and perhaps will also go with a Monica II DAC/DACT active preamp soon, with his BP transport on the horizon.
Thank you both Jeff and Dan. You don't know how much you have positively influenced me in enjoyment of this hobby, which seems to get me closer and closer to the audio truth.