hey GONK i have connected to all other equipment on a separate plug a Monster Cable HTS850 but not the amp .... the amp is on its own 20a circuit
and its own plug if i plug all my A/V + AMP into HTS850 and then into my new 20a circuit i get the HUM again (is this really a case of not enough power in my house ???) can i test something ?
PS:never had anything like this with my last System Yamaha/Cinpro which i just sold

anyway thanks for your HELP
SUpertom