Maghister is on to something. Volume needs to experience music fully are very room acoustics and system dependent.This is ELEMENTARY acoustic....Thanks for your observation...
The volume of each set of frequencies vary ALSO with the pressures zones distribution of the room for an acoustician and do not vary only with linear distance and angular distance from the speakers.......
The general volume vary with his hands playing with the volume control of the gear only for a children...
Confusing the two is ridiculous...