I should be able to do comparison testing Monday or Tuesday between the 975 and the Marantz. Just got busy and haven't had a chance yet.

Based on this thread and opening a ticket with Outlaw, it appears the 975 is functioning as it should.
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Panasonic TC-P65GT50 (65" plasma)
Outlaw 975 | Outlaw 750
Paradigm Monitor v2 Series 5.1 (Monitor 11 fronts | Mini Monitor pair as center | ADP-370 Dipole Surrounds)
Outlaw LFM-1 Plus Subwoofer
SA8300HD Cable Box | Sony BDP-S550 Blu-ray Player | Apple TV