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I have recently come upon a couple of DVD's that are Dolby Digital but do not have rear channel information. The lights on the front panel of the receiver indicate that only the front channels are active. At first I thought something was wrong with the receiver, but when I put another disc on, everything was back to normal. So I am thinking that these discs, which are movies that are mostly talk and no sound effects, have Dolby Digital but no surround? Is that right? Has anyone else encountered this?
Follow Ups:
The Dolby Digital codec specs allow for a number of channel formats including mono and stereo and four cahnnel in addition to 5.1. If you get a movie with just two channel stereo it can be greatly enhanced by choosing Dolby Pro Logic II Music, which derives 5 channels from 2 and gives a semblense of surround dound. Although many "old" stereo movies are remastered in 5.1, not all are.
Not all DVDs have surround sound. In my collection are discs with mono sound, 2 channel sound, and 5.1 channel surround sound. I have a sneaking feeling that I have a disc somewhere with 4 channel sound. The lights on your receiver will tell you how many channels, and which channels, are included in the sound track.If your DVD player allows you to change audio soundtracks, and I think pretty well all players do, it's worthwhile checking just what tracks are on the disc. Some DVDs include both Dolby Digital and DTS surround tracks, and I tend to prefer the sound of the DTS track. Other discs have both surround and stereo tracks. Just accepting the default track doesn't guarantee the best results.
Finally, look at the back of the DVD's package. There is usually a mention there of just what sound tracks there are on the disc including details of the number of channels.
nt
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