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>Is the difference attributable to Dolby encoded media, e.g., DVD, CD, etc, (AC-3), or Dobley encoded WAV files?
No, it's just about "decoding"/"passing-through" - e.g. "AC3-passthru" channels are for (obviously) AC3 pass-thru only (e.g. they transfer raw digital data - not audio signals)
And "non-pass-thru" AC3 channels are for any audio produced by kX's built-in AC3 decoder (when decoding is enabled).
Regarding "LFE" and "Redirection" frequencies: Well, this is Dolby's stuff. kX's surrounder is a minimalistic multipurpose tool and it's not advertized to follow any 3rd party standards or whatever. Particulary it was not indended to provide "LF of Bass-Redirection" = "Dolby's LFE"
Actually, i would recommend you to use a crossover if you need more accurate split.
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