Not an answer to the question, but this response I've just made in anotherbthread may be of relevance:
I use Hugo direct into power amp. Standard Hugo so no remote vol control (never had one so not something I miss!) works very well, and misses out all the electronics of the preamp - and for me on the odd occasions when I want to use a non-digital source I unplug and subsititute a preamp - a bit of a hassle, but not often enough to worry about, instead revelling in the SQ.
However (1) how well Hugo works direct into power amp may well depend on the particular model, e.g impedance characteristics. And however (2), I understand that Naim don't recommend using Naim power amps without a Naim preamp because their preamps curtail unwanted ultrasonic frequencies whereas direct sources might not.