The XP-15 sets gain and cartridge load via two 8-gang mini switches on the back panel, under the RCA jacks. Three gain settings, and a bunch of resistive and capacitive loads. You can combine switch positions to set any load you need for your cartridge choice.
I have been looking for information myself, but have not seen much. I think there is a manual on the Pass Labs website. It is supposed to be better than my Xono, and it costs less. They will soon be coming out with the two-box XP-25, which I understand will be substantially better.
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.