Mark, I think there are a bunch of technical/physics reasons having to do with all the other stuff like sound wave transmission viz. the room acoustical properties (each space has it's own resonant freq.) which will vary depending on the space. You probably know some of that stuff...I hope someone here will chime in on that theory.. .
IMO, I think one other (fairly easier) way of distinguising bass is by virtue of timbre. My own theory is the natural timbre of the bass instrument if played at the same freq. range as opposing instruments will stand out better when EQ'd
without a lot of lows. Kinda like 80's music, or maybe even The Who (ie, being heard over Keith Moon/Townsend.) Or even when doubling parts on vocal harmonies (doubling the root note or melody an octave up/down), by virtue of the persons natural timbre, you get a different/better sound. I don't know, I'm speculating on those analogies...interesting subject.
I could stand corrected....

.
Jimbob