I just got a Pass XA30.5 and I'm looking for a preamp. I would like to spend in the 2k range. I'm interested in a tube pre but not married to the idea. I would like something with a balanced design and balanced connections to compliment the Pass amp. I was looking at the Schiit Freya+ but I'm not sure if its impedance characteristics would match with the Pass amp? I've seen some used Pass Preamps on A-gon that look cool? Any suggestions?