Thanks for the insight. I think it would be fun to try some non-CSP2+ combinations with the Taboo, plus there really is no choice with the 3-4 month wait anyway. I would definitely make sure the preamp has equivalent voltage to the CSP2. Could be some interesting offerings like Dynaco and Dared tube preamps that I find on Craigslist.
Well, I mentioned once before I tried my HFA 'Silver' tube preamp with Taboo. Maximum output "30 Volts RMS at clipping" is comparable to the CSP2's 36V (RMS or peak?), which seems like a healthy output power to me!
The combination did not sound good - very flabby and unfocused.
This was early days though. I briefly tried again a month or two ago. I guess the Taboo - its VCAPs burnt in - was much more 'ready': it did a much better job driving my (5 driver, 4-way) speakers this time. The bass was round (not nearly as tight as with the Plinius) and there was noticeable warmth, but altogether it was engagingly musical.
Although I think more efficient, single-driver speakers are probably the Taboo's forté, I could definitely live with this for quiet evening listening sessions.
I don't think I tried the LCD2s or - if I did - there was no 'magic'.
Now I have the CSP2 I will try swapping them round sometime in October and report back.