If Amazon.com is
correct , then the 1050 is doing it's job -- the disc is listed as having a Dolby Digital 1.0 soundtrack, in which case the entire thing should go to the center channel.
I suspect that you could get it to go to the left and right mains only by connecting your DVD player's 2-channel analog outputs to the 1050 and switching to stereo mode...
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Gonk