I own a Pass Labs X2.5 and I can honestly say that the sound is very neutral- the circuitry is the same as the more expensive X1 with only the difference in the seperate power supply for the X1. I have paired it with the PS Audio HCA-2 and it makes a very fine match-up. The sound is far from flat and delivers the music in a very convincing and realistic fashion. Similar to Jeff Rowland and not as clinical as Krell- really the best of both worlds. It has great resolution and detail. The depth is very good (not sure why the dealer above was disappointed)- I played Diana Krall's Live in Paris and the depth is very good- this is a very musical pre-amp but like all things you have to audition and let your ears decide.
