Pass pre + Spectron Musician III - will this work?

I have not heard the Spectron. I do however run a Pass XP10 in my system with Bel Canto Ref 1000 M class D amps and it sounds good. You do need careful matching of interconnects to be sure you get fleshed out presentation. Good luck. The Pass pres are very nice. I'd characterize them on the neutral side.

I know a few poeple who use PASS Pre with Spectron. I cannot remember any complains from them. I, myself, use tube preamp (Joule-Electra) so I would be a poor judge.

All The Best

I have tried the Spectron Musician III MK2 mono-blocks with a TVC unit and the Benchmark DAC1 Pre. None of these have the finesse that the Joule Electra 300 ME has, but the sound was still great. I never got a lean sound with any of these preamps. In my experience and in my system, the sound can get lean if I use higher gauge (12awg or higher) speaker cables. This is due to the Maggies demanding lots of current, which the thinner wires simply can't deliver.

I have not heard the Pass Labs XP20, but I doubt that the sound will be anything less than stellar with the Spectron amps.