The Backert Rhumba is a splendid match with my XA-25. I get pretty much the same sonic qualities as wlutke above with his Herron. The XA-25 is a great match with tubed preamplifiers, IMO!
Exploring Preamp options for the Pass XA25
Please feel free to share preamp options for the XA25. I presently have an Acoustic Research LS-3 and am not sure this is the perfect combination. The Pass Headphone preamp is one option that I'm considering. Tube preamps?