DPL IIx -- or Dolby Pro Logic IIx -- is an extension of Pro Logic II (PL II). PL II has been available for a couple years, and offers 5.1 surround derived from a stereo source (TV, VCR, Dolby 2.0 DVD's, CD's); it is a significant improvement over the original Pro Logic, which produced just 4.0 (left and right, center, and a mono surround signal). PL IIx is an addition to PL II that adds discrete surround back channels, or 7.1. The 950 includes PL II and a separate bit of processing called Cirrus Extra Surround that produces a mono surround back channel from any 5.1 source (including PL II) which can be sent to one or two surround back speakers.

Personally, I would not wait for PL IIx unless there were other things that I was also waiting for -- it's too easy to let yourself wait forever to get the next new thing.

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