Give Reno HiFi a call and ask for their thoughts. I have a Ref 3 with a pass labs 350.5 and it works well in my system. Good Luck.
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Just so you know ARC preamps are not really balanced according to the official balanced guidelines they do offer balanced type connectors. As a result the ARC preamps don't work well with low impedence amplifiers like many solid state amps are. I'm not sure about Pass. But I would consult with both companies before I mixed them just to be sure. Impedence mismatches are more common than you might think and are sometimes the reason why we think some components may not sound good.
A tubed preamp can be a rewarding combination with your amp. I've seen definitive statements on this website that:
1) AR Ref preamps are not a good match with Pass XA.5 series.
2) AR Ref preamps are a great match with Pass XA.5 series.
My interpretation would be to proceed cautiously and critically, and seek a price where you could resell if the sound was not superior in all regards. Do not accept mushy bass or a rolled treble for some midrange bloom.
I do think it is important to use the balanced connection on the amps. I would be reluctant to use a tubed preamp that people charactarize as smooth and musical. Not that those types of preamps are bad, but they may be too much of a 'good' thing with the Pass. My opinion would be to seek a highly resolving preamp with good frequency extension.
I can give a firm recommendation that the BAT Rex and Pass XA.5 is a great combination. Really, really.
At this point, I am considering the Audio Research LS-27 along with the Pass XP-20 as preamp possibilities. Some of the people who have suggested the Pass XP-20 have told me that I would get tube-like sound without the maintainance of tubes. Other reviews I have read about the Pass indicate it is on the neutral side. I would think that the Audio Research LS-27 would effect my system with much more of a tube like sound and the Pass might be better in the bass area but without hearing either of them, its just speculation.
I tend to think both would be a good match with the Pass XA100.5 Monos that I own.