I do have the HK Audio I believe (I am not near the car at the moment). I do not have TV tuner or aux input.

I had a Dension Ice-Link with iPod for many years (replacing CD Changer), then went back to CD Changer for a while, and have recently installed iPod/Intravee/Alpine KCA-420i set-up (also replacing CD Changer).

I have never had any audio issues with any of the above, other than the Nav. volume - which had the same problem with all three set-ups