I have been listening to my new X350.5 amp for a little over 3 hours. It replaced an X350 and out of the box it was sweater and made my Dunlavy SC-4a speakers sing. I've usually maintained both tube and solid state amps and for the 1st time, I may have to re-evaluate that policy. My present tube amps are BAT VK-60 monos and they are fine, musical amps, but listening to Holy Cole's "Take me home " on the X350.5 is a powerful experience that has never been matched by my former ARC VT-200 or the BATs. I can't wait to see what happens as the amp progresses through burn-in. The amp is driven by an ARC Ref 2 mark 1 and it doesn't get halfway through its class A mode. My hat goes off to Nelson Pass on a wonderful new product.
Jeff
Jeff