I have hooked up my two Pass XA.5 amps directly to the panel on two dedicated 20A circuits via two 15' runs of JPS Labs in-wall AC cable with Furutech IEC connectors. The cable goes through the floor behind each amp. There are no outlets. This direct connection resulted in a much lower noise floor. I've never had a problem with power surges. More details are on my system page.
You can call Pass Labs, but I don't think they recommend the use of power conditioners and will also discourage experimenting with different power cords, though some on this forum have reported improvements with some power cords over the stock ones.
You can call Pass Labs, but I don't think they recommend the use of power conditioners and will also discourage experimenting with different power cords, though some on this forum have reported improvements with some power cords over the stock ones.