Good evening everybody,
I have connected my edision mini box to tv via hdmi lead.
I wanted to use my surround sound system so I connected the AV connecter to the box and the other phono end to the surround sound box red and white only.

the above results in a annoying buzzing noise through the systems speakers more noticeable on quite channels.

People told me it could be a earth buzz but not sure if it can be eliminated also if it is damaging system or box.

any thoughts or ideas greatly appreciated