Audio Refinement Multi-2, will warm up the Pass a little and is super good for the $$$$. Refined and smooth and capable of nearly 200 watts despite the specs.
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In my experience the Pass X-2.5 has better resolution at the frequency extremes, better vocal reproduction, and better dynamics than the Adcom GFP-750.
I used the Adcom GFP-750/Adcom GFA-5802 combo for a while with great results. They do have a natural synergy.
But, while having excellent midrange and vocal reproduction, the sound was alittle too warm and dark for my own tastes. The highs sounded slightly rolled off, and the bass was alittle loose.
The Adcom GFP-750 is a GREAT preamp, but it ultimately lacks top-end resolution and decay, and slightly screws up vocals with a dark quality in both active and passive mode, and it also sounds slightly grainy in active mode as well.
The Pass X-2.5 may match up well with the Adcom GFA-5802 since the 5802 circuits were also designed by Mr.Pass, and since the 5802 has a warm overall sound and the Pass has a slightly cool sound, they may "balance each other out" if you know what I mean.
Best of luck with your decision.