I own the Harbeth SHL5+ powered by the Accuphase e-600 and i've never been happier. It's been about 3 years now. I haven't heard the Pass but I've heard good things about it. I got a deal on the Accuphase from a friend who owns a shop (it was a demo). It's an amp I never ever thought I would or could own because they cost (to me) a ton of money. If you live anywhere near Rochester NY I'd be happy to let you listen. I melt like butter every time I play music through it. I'm sure the Pass would do the same thing. It's plenty of power for me but I've reached an age where I listen to music in a different manner than I did 30 years ago.
