Thanks, guys, all input is appreciated. Believe me, I've been looking for any settings anywhere in the chain that might help. :-)

The DVR seems fine with the other two processors. It's odd that the output is notably hotter from the 950. My other DVR is dead, but I'll check the replacement when I get it and see if it's the same.

It looks like I have a later cable software version than what's in that manual. There are three settings in the Audio Coding menu: HDMI, Dolby Digital and PCM. When using HDMI for audio, neither of the other settings produces sound. I also tried connecting via coax and setting the coding to Dolby Digital and PCM, but the output level stayed the same.
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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