Hum starting between -85 to -80db

[Craig1512]

Thank you all for running this little test. It appears that @Axel was able to replicate the issue similar to mine with those level meter bars sitting just above the -80 mark whereas @baddog results were level at -100, strange indeed. BTW the config drop down box for cartridge selection is temperamental, I found I had to select a different brand, then back to Ortofon, then the cartridge drop down box worked for me. When I was trouble shooting this the other day, we did try turning every appliance off and on, including the refrigerator, also switched the light circuit breaker/safety switches off at the mains board, I do have LED lighting (no dimmers though). The only interference we got was from the air-conditioning, a high pitched sound, so we left it off during testing. @Soniclife I don't use wifi and during testing all inputs were turned off, the only other input I use is USB for my Aurender, this input is dead quiet and level is -100. I shall lodge a support ticket with PS Audio regarding the power plant P5 and ask if there is a known issue or a setting which may correct this, process of elimination to rule out power supply. My amps go in for the CI board upgrade at the end of January I shall ask the Devialet engineer to check this out for me also. I maybe able to try a SUT on a 30 day trial from my dealer they are an authorised dealer of Rothwell products which I have read manufacture good quality SUTs. Thank you once agin for suggestions, advice and assistance.