Pass Labs vs ARC

I would expect you to hear from Bo1972 at some point. If you look at a recent ARC Ref 5 SE thread you'll see he vastly prefers Pass to ARC. You'll also see there are plenty more who like the ARC.

Meant to compare ARC Phono Ref 2se, not the Ref 5se, which is the line stage pre. Thanks.

I can't comment on the two specific pieces of equipment you mention, but I can comment on ARC vs Pass. Both are quite good but they are different flavors. Personally I prefer Pass (I own Pass gear). I was once upon a time heavy into tubes and I generally preferred CJ to ARC (I once owned an ARC amp for a very short time). 

So so generall my impression is that ARC is a little sharper than is Pass. But if you want tubes, I kid you not, I prefer Rogue to either CJ or ARC (I sold my JC Premier gear and went to Rogue) 

I am assuming, because this is in the Analog forum, you are referring to the Audio Research Reference Phono 2 SE and not the Ref 5 SE preamp. I just auditioned both the Ref 2 SE and the XP-25 phono preamps in my system in the past month and decided I liked the Ref Phono 2 SE better in my system.  The sense of space the Audio Research unit provides is pretty extraordinary and has been one of the most satisfying upgrades I have done. The Pass was tonally excellent and had particularly great bass definition but the image size it created was smaller and the image had less depth-- again in my room with my system. In my unscientific opinion, the Ref Phono sounded better in my system because I have an Esoteric C-03 as my preamp and I have consistently liked over the years systems which have either a tube preamp or a tube phono preamp but not both.  The same has been my experience with solid state units-- one is good , two is too many.  So if you have a tube preamp, I think the Pass unit may be your ticket to bliss. If you have a solid state preamp as I do, I would recommend your first audition be of the Ref Phono.  Hope this was helpful.