So I have this receiver from past 2 years now. It started making buzzing noise a year ago. Its starts very randomly. Buzzing noise doesnt increase with volume. Its starts with static cracking sound then continuous buzz till you switch off.
I tried removing all inputs to find the culprint. However, receiver still makes buzzing noise without any inputs plugged in.
Then I thought it must be grounding our wiring issues with current house. So I tested it 3 different friends place in 2 states. Buzz still goes on....
And lastly, I took it to Marantz service center in NYC thinking it must have a blown capacitor or something. Yet, they couldn't find any issues with it. So they just upgraded the firmware and gave it back. It worked flawlessly for 3 months and last week it started making that buzz again.
I have not idea what to do now..other than dropping it from 4th floor
May be I should try that voltage filter humX???
Set up details
Marantz sr5008 >>>>AMP: Onkyo 2 channel>>>>PSB Left and right
Inputs : Fios cable, Xbox one s, Amazon Firebox, Fiio X3 digital audio player and ethernet cable
Output: Just one to Tv