New dedicated lines have high noise floor.

I just installed two dedicated lines for my system.  Each is on its own 20a circuit breaker.  I used 10 gauge hospital grade MC cable (exact same length) and Cardas 4181 duplex outlets.  I was expecting a quieter noise floor and better sound.  I have a 3x to 4x increase in the noise floor compared with a regular outlet nearby.  One of the circuits has a "crackling" sound.  For the best results, I need to put my amp and source equipment on a single outlet.  If I use both the sound gets worse.  Any ideas?  I need to have my electricians come back, but would like to have some audiophile wisdom for support.