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It depends on how the processor is used an how it is designed. If you tell the AVR that you have a speaker setup that has only 3 front speakers, and if the AV processor so informs the PLIIx decoder, then it will use an embedded 3-ch mode that prevents removing the strong surround cues from the front channels.Originally Posted by WillyJ 
I sometimes like to listen to 2 channel sources in Dolby ProLogic II mode... If Audyssey and PLIIx are assuming I have back surrounds and I have them off I am wondering if something is getting routed to them which means I am missing these streams since they might be sending streams to them that normally would be going to other channels.

I sometimes like to listen to 2 channel sources in Dolby ProLogic II mode... If Audyssey and PLIIx are assuming I have back surrounds and I have them off I am wondering if something is getting routed to them which means I am missing these streams since they might be sending streams to them that normally would be going to other channels.
If the decoder is operating in 5.1 or 7.1 mode, and you mute the rear speakers, then there may be cases where surround effects are reduced or lost.
Easiest way to tell is to play a 2-ch surround test signal that has rear encoding.
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Assuming you turn off the wides in the speaker setup menu or in the surround mode controls, it will not discard any information.Alternately, does turning the wides off when it is steering streams to them mean I am missing some critical streams that would normally be routed elsewhere; To the front mains for instance?
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That might only be offered when the speaker setup is 5.1. Sometimes the name remains PLIIx even in that case for ease of U/I design.I looked to see if there was an option for plain-jane PLII but didn't see it in the AVP menus.
If a surround decoder steers dialog to the center speaker, but the speaker is disconnected, is it not losing "true" information?





















