If you get sound on direct mode say from dvd but no sound when you go to dolby make sure you have the right input selected by pressing the digitat input button on the front of the amp,ie if dvd optical out is pluged into amp optical input 1 select this on amp then set audio to prologic2.DVDs through this input will decode to dolby digital/dts.
hope this helps.
CABLE GUY.
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