Gotta love Nelson Pass

I would suggest a bit caution when using Nelson Pass's gear. Many of his products have very different appropriate applications.

Many of his products have very different appropriate applications.

Hello, @unsound  - will you please elaborate on that? 

Everything explained on firstwatt.com , even about discontinued models. For example my F2J current source power amp is designed for crossover-less, high sensitive speakers (full range drivers) and not suitable for the speakers with crossover. For traditional speakers he has different amps. 

^Yes, even some of the Pass Labs branded amps, like some of the Alephs have some limited applications.