Cesar, if the speaker configuration is correctly set for the 2807, i.e., no back surround speakers, just 5.1, then nothing special has to be done to "remove" DPLIIx, since DPLIIx only comes in when back surround speakers are shown. With a 5.1 setup there'd be no place for DPLIIx to send the back surround material extracted from the side channels.

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Enjoy the music, not the equipment.