Pass Labs XP-10 & XP20 Users

I recently got a XP-10 preamp. It provides tremendous clarity, a deep and wide soundstage, nice seperation of instruments, lower bass, better defined bass, and a touch of warmth (which is a plus in my system).

It has been in the system for a couple days now, and I am thrilled with the results. This thing is so resolving (without being harsh), that my friends and I could hear differences in the sound depending on how we spiked and isolated the XP-10. A sand bag on top also changed the sound. I will pick a final setup once it finishes breaking in this weekend.

I am using this in a 5.1/2.0 system. The Bypass function is setup on input 5 which is an unbalanced input. My Prepro has both Balanced and Unbalanced outputs. In theory the balanced outputs coming out of the prepro should sound better, so I have it routed through Input 1 and manually set the volume to max and Gain to 0.

Does anyone have any tips or tricks about these preamps? They seem pretty straight forward. It seems the only setup/optimization may be related to spikes, isolation, and weight placed on top of the unit.