What pre are you using for your Pass X.5?

I use a Pass Labs XP 10 with my X350.5 and it sounds great. I heard a X250.5 with an Allnic pre-amp and it sounded awewsome! I used a Pass Labs Aleph P for 4 years and had great results , and it sounded much better than all the other combinations I tried with my X350.5. at that time. I tried an X1 and I did not like it and went back to my Aleph P. However the XP10 is much better than my old Aleph P and the best match I have heard yet with my X350.5. Make sure you have good interconnects between the Pre-amp and Power Amp. If you are using a Pass pre-amp and a Pass power amp use XLR Balanced between the two, they sound better that way.

I used a 2.5 with my 250.5---it really wasn't my cup of tea, but my problem with Pass if you are limited with preamplifier choice due to the impedance (most tube preamps will not work).

I believe something like the Cary SLP-05 should work with Pass as I recall. I have heard the new XP line is considerably better than the older preamplifier line. Also, the remote on the old version to be put simply, is terrible to use.

KeithR