Is moving from the ARC Ref 6 pre to the Pass Labs pre is a lateral move? Like choosing between chocolate or strawberry at Baskin and Robins. If so, it's a lot of trouble and money for a lateral move. Yes, the two have differences but does one really outshine the other? Think about moving up to a Gelato- or in Audio terms the next level up in preamps if wanting to make a change.
Or does the XP-32 already correlate to an ARC Ref 10 in sound quality?