I use a few different volumes generally:

Legacy CD's which I would describe as simply transcribing the final mixed analogue audio digitally to red book audio standard or AAD, at 65.

Digital re-masters which have used original unmixed analogue audio to remix and re-master like the Giles Martin Beatles 50 year anniversary releases of Abby Road etc at 60.

Older THX DTS or AC3 encoded Blu-Rays at 70.

Newer THX DTS or AC3 at 65

Netflix streamed AC3 via my Pioneer T700 at 60.

Air-Play streamed to Roku for background music at 55.

Go figure!

DSP8000SEU, DSP5200HC, DSP33, DSW1500, 808v5, 861v4, WiiM Pro+, Panasonic 55" Plasma, DMP-BDT700 Blu-ray,
MECOOL MEon1, Russ Andrews Signature Power Block, UltraFuses, SuperFuses, Kimber Signature PS Interfaces.
Prior: DSP7000.2, DSP6000.2, DSP5000.2, DSP5000.2HC, 508.24, 568.2, 596, G98DH & G68D.
Jaguar F-Type; Meridian 770W Surround System