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Re: Dolby-pro logic and Dolby Pro-logic II
Yes, Dolby Pro-Logic and Pro-Logic II(x) simulate surround from a 2-channel source. If you cannot activate these modes, then perhaps your receiver is actually receiving a pseudo-5.1 Dolby Digital signal from your source. I'm referring to a signal that is physically 5.1, but which carries content in only two of the channels. This is seen as a 5.1 source (because it is), and further processing will generally be unavailable. This is quite possible with the digital output from a cable/sat box, but should be much less likely with DVD playback...
Another possibility is that you've physically connected all of your speakers, but haven't told the receiver that you have 5 speakers.
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