If you have a digital audio connection in place and in use, you will get a Dolby signal. I suspect that it will only be a 5.1 signal -- and even if it does have EX matrixing included, there may not be a flag identifying it in the stream. However, there's absolutely nothing stopping you from enabling EX or Cirrus Extra Surround with any signal to get surround back data (I use CES almost any time I'm in surround mode, including Pro Logic II with regular TV watching).

NEO6 will not work with a 5.1 signal -- it (like Pro Logic II) can only be used with a two-channel input.

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