I get excellent sound quality from my Cox Cable digital music channels. But, on a lark, I picked up a FiiO D0K3 Digital to Analog Audio Converter With Micca 6ft Optical Toslink Cable - 192kHz/24bit Optical and Coaxial from Amazon. Cheap. Substantially improved sound quality from cable box.

Enjoy the Music. Trust your ears. Laugh at Folks Who Claim to Know it All.