as John said, the HD is an 2-Track projector an the D is only single track. From the two monitor outputs of the HD you can amplify in Stereo - if the film is in Stereo . But only from the monitor outs. On the Main-Output is an mixed signal from both tracks or from one track in mono. Hope my english is not too bad und you understand, what I want Best regards, Michael
-------------------- Just remember the time when Home Cinema was not a disc...keep perforated