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I bought the M700s at the same time as the GC Dac/Pre. Both were thoroughly broken in. I found the pre desperately wanting/needing a better power supply. I reached out to Paul, but got a BS answer, which surprised me as he is known to have outboard PSs. I replaced it with a Audio Alchemy DDP-1 which was a huge improvement that took several steps up when I was finally able to find/buy the matching PS 5 power supply. The amps were quite good, but I had a unique opportunity to try (30 day in home) a EVS 1200 (dual mono based on IcePower AS 1200 modules, then highly tweaked by EVS/Tweakaudio: 2.5+ times the power for the same money. The sad news is, EVS stopped production on it, but has switched to VTV and Purifi mods
I have tried to hook up the Stellar S300 with other preamp, a Nuprime headphone amp, a Mcintosh pre and Wired4Sound STP 2. While the latter pre in general, I like more than Gain Cell, guess what, i like the combination Gain Cell with S300 the most among these four (I use STP with another class D amp in my main system). You may trust Paul from PS audio, there should have been some reason for his answer. Earlier I have asked PS audio if their BHK pre would fit better with S300, the answer was no, that GC is a better fit. I didn't try Audio Alchemy DDP-1, would be interesting but I am so far satisfied with the Gain Cell.