hissing over spearkers etc (car computer)
hi guys, i have recently updated my car computer to a full indash one (it has its own onboard amp etc and is very well made - just a standard iso multiblock on the back.
as my car is bose amplified i purchased the PC9-408 to enable me to connect the aplified speaker outs to the bose amp.
anywas i get noise all the time even if mute the pc, noise when i move the mouse or the is HDD activity. i removed the harness adapror and tried that and got same issue.
people have mentioned bad ground or a ground loop to me before but since im not using RCA's i cant put in an inline ground loop isolator. but i have checked all my grounds and there are good.
i just wondered if anyone had any suggestions?