I'm not able to respond to the Cox Digital source but can in regard to a normal TV audio feed. My Nakamichi CA-1 (as well as all my former pre-amps) had severe signal noise with any source that had it's own amplification. I discovered that if I opened up the TV volume to maximum (while turning off the internal TV speakers) the line noise disappeared. So, I assume the problem existed in the poor quality electronics in the volume pot. Good luck!
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