Charles, I asked him about the 10 and 20dB gain options. His answer was pretty much along the lines of "the current CSL has 14 dB of gain. That should put you in the 10 to 2 o'clock area for most of your listening." He appears to have been correct in his prediction, although I think it will tend toward the 10-12 o'clock area.
I think if you were trying to drive his 97 dB efficient speakers with the 20 gain CSL you could have some issues. I don't know if he would have offered a lower gain option if I had pressed the issue. He seemed quite confident the stock unit would work. I would have been concerned about higher gain though. After all, I was using a unity gain passive, and that not ever wide open.
BTW, when I went to bed last night the brightness had passed (~ 5 hrs). After playing at low levels all night and all day, not only is the brightness gone but the lean tonal balance is warming. I just love what i am hearing.
I think if you were trying to drive his 97 dB efficient speakers with the 20 gain CSL you could have some issues. I don't know if he would have offered a lower gain option if I had pressed the issue. He seemed quite confident the stock unit would work. I would have been concerned about higher gain though. After all, I was using a unity gain passive, and that not ever wide open.
BTW, when I went to bed last night the brightness had passed (~ 5 hrs). After playing at low levels all night and all day, not only is the brightness gone but the lean tonal balance is warming. I just love what i am hearing.