I'm yet to be convinced of that the addition of rear surrounds represent a general improvement. Theoretically, I realize, it should. And certainly it does, for specifically encoded rear effects (few and far between though).
But in my set-up, I get a smearing of the front image (reduced clarity and definition), a constant problem. My rears are directional (Revels), not dipoles or bipoles.
Of course. You are letting your processor "mess with" the signals to synthesize rear speaker output. As Rwwear has suggested, just play stereo as stereo (and 5.1 as 5.1).
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