Thanks for the great info, Ted - though it’s admittedly a bit unnerving that this may be going on without my even knowing it!
At this moment in time I don’t have the option to run my system completely balanced, so I don’t have the option of even determining by trial/error if the 60Hz/120Hz hum is even occurring.
Perhaps I’ll just need to wait until I can run my system fully balanced (only missing balanced chain in my system is the preamp) to discern whether I hear a difference or not?
To my ears my system is sounding quite nice, but I’m admittedly an amateur in terms of perspective and experience in what quality can truly mean. Though my Bluesound Node 2 into my PS Audio NuWave DSD DAC (coax) into my NAD 326bee (acting as preamp) into my PS Audio Stellar S 300 into my Monitor Audio Silver 300’s…all running UNBALANCED RCA’s from bettercables.com (silver serpent’s) is sounding quite nice.
Perhaps ignorance is bliss? :)
I have all upgraded power cables which are quite nice (for my budget anyways - all audioquest) along with a PS Audio Duet power conditioner with Canare 4S11 speaker cables. Any chance anything in this chain could be a victim of common noise?