hairy_hen, thanks for the explanation, you are always really helpful.
I would like to know what do you think of non-Dolby matrix surround "extraction" (process, decoding) techniques, like Shure Acra Vector, Fosgate 6-axis and so on...
Reading here and there, it seems they are very good, even better than Dolby Pro Logic, apart DTS Neo 6 and CircleSurround, which are not so good - or plainly "wrong"...