I’m trying to get DVD audio into a mixing board(radio board) cleanly. The DVD audio is clean UNTIL I connect it the video cable between the TV and DVD player, then a strong hum comes through. I tried different tvs and dvd players, and the hum always returns once the video connection is made between the tv and dvd player. I’ve also experimented with grounded power strips and shielded cables with no success. I’m trying to get DVD audio for audio production, so the hum negates using the ‘hum-backed’ audio. Thanks.