Digital Cable Music Choice

Hello all, I listen to Music Choice from my digital cable box as backround music when I am not playing Cds .
I now use a digital interconnects to watch DD TV but use the analog outputs from the cablebox to listen to music. I was thinking of upgrading the analog interconnects from the cablebox to something like a audioquest Jaguar with DBS , Would this upgrade improve sound or is it a waste of $$ since the signal out of the cable box is limited ?
Thanks~