I have an LS26 and use the POC form HT as well. In my understanding of the PROC vs a TUNER/CD/etc input is that the LS26/REF3 really don't do anything other than pass that signal through at input level. I am curious how you control the volume on you XM? With the TUNER input you would have full benefit of the ARC Circuitry. At least this is how understand it.
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