better to ask this at http://www/avsforum.com
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Try using the digital out on your cable box, not the analog outs from your TV, into the DAC. On the Motorola cable boxes (Comcast), its not clearly marked as digital out. It reads SPDIF (digital out shorthand !). Then run the analog outs on the DAC back to the analog inputs on your TV if you are using the built-in speakers for audio.
Hope this helps.
"spdif"= Sony Philips Digital Inter Face---The guy whom sold you a 2ch dac should have known better. All the new cable or Sat. boxes output only the DD,DTS format. (Even if the source is DD 2.0)You have to hook this to a processor or a receiver) Further, DVI is video,only HDMI is vid.and aud.on one cable and this must be hooked to the newer pieces with HDMI input.