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Allow me to rephrase: The 990 is a clear step up in functionality and connection flexibility from the 950. Will Dolby II sound different on the two units? Not unless the circuit has been changed on the 990.
So if the circuit has been changed you admit they would sound different. Using your same logic the 990 must sound different compared to the "Lexicon, Meridian, Rotel, Bryston, etc." since I doubt they all share the same circuits as the 990.