With all channel trims at 0, a -30dB setting on the 975 volume control produces a 75dB test tone from the 975.

The same -30dB volume setting produces a 60dB test tone from the Disney WoW Blu-ray. Cable box and Apple TV sources seem roughly the same.
_________________________
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