I sold my #331 in favor of the Pass Labs Aleph 4. I had both in the house for a couple months, going back and forth to make sure I wasn't crazy. The Pass was much more natural and airy. The Lev sounded dull in comparison. I invited some other audiophile friends over to listen and they agreed. I have a comment about Lev335's response. Nelson Pass is proud of his amp design because its NOT complex. In fact the signal path of the Aleph series is only 2 stages and very few components. I think he was on to something there. Pass amps are a solid state equivilent of the Single Ended Triode.
