Stereoheads, right now in my system I have a pair of Pass Labs XA-100 monoblocks and a pair of the legendary Threshold SA-1 Monoblocks driving my MG-20's.
I never warmed up to Pass Labs X series amps, but the X.5, XA, and XA.5 series take the best virtues of the Threshold house sound, warmth/liquidity/natural timbres, and adds more clarity/transparency, extension on top, and bigger more layered soundstage to the mix. So, I would recommend you try to find a used X-350.5 to audition. Take a look at my review of it here on the GON.
I never warmed up to Pass Labs X series amps, but the X.5, XA, and XA.5 series take the best virtues of the Threshold house sound, warmth/liquidity/natural timbres, and adds more clarity/transparency, extension on top, and bigger more layered soundstage to the mix. So, I would recommend you try to find a used X-350.5 to audition. Take a look at my review of it here on the GON.