If it's only noticeable when the volume is cranked up then I'd say it's probably normal for that amplifier, and may be as a result of how they do the source switching, and / or the layout of the traces on the PCB.
My guess is you'll have to live with it.
You could always try connecting the CD player to the tuner input and see if it's any different .... it may be that crosstalk levels varies between channels and the aux and CD is the worst. Just a thought.
My guess is you'll have to live with it.
You could always try connecting the CD player to the tuner input and see if it's any different .... it may be that crosstalk levels varies between channels and the aux and CD is the worst. Just a thought.