Last week I bought 2 x Furutech CAT 8 cables and 2 x Furutech New Model HDMI cables specifically for my OPPO Blu Ray, Smart TV and Android TV Box.
Besides an upgrade in picture and sound quality I got a large sound improvement in my main system.
I can only put this down to the heavy shielding in these cables. Ordinary HDMI and Lan cables must create a lot of RFI.
I'll be getting some ONTI cables soon too.