Although there is a house sound, in the pass world there's a substantial difference between the x.5, xa.5, x.8, and xa.5 lines. I've only compared the first two, but preferred the xa.5 by a substantial margin. As others have started, the same is true of the different bryston generations. I think you'll simply have to audition. As everyone always states, renohifi makes that easy for the pass products...
