I have never heard a sober review of the Krell family where it does not say you can't beat it's grip on the bass drivers, AND say it has a bit of the strained treble that can result in listener fatigue.
The Pass lacks the Krell's bass death grip, but offers, IMO, a smoother mid and sweeter highs. It just so happens a friend has my Pass over right now where he is comparing it to his Levinson. He wants to buy the Pass.