Originally Posted by cap'n
I dont understand your repeated mention of volume velocity. Our ears are pressure sensing organs.
Only in isolation. Torso, lower body, chair, etc, all interfere with the velocity field and create pressure at places where you might not expect it.
And the lower the frequency, the larger the "model" needs to be.
This is easily demonstrated in the 100+ Hz range, where you will find when you put your ear in a null in a bad room, it's not the same position as the null for a pressure microphone.
The effect is certainly less at 50 Hz. On the other hand, 40Hz is a wavelength of about 1152/40 = 28 feet (approximately), which puts a human at approximately a 1/4 wavelength, when you certainly do start to see interaction. (Yes, I'm aware most of us aren't 7' tall, but you don't have to hit a whole 1/4 wavelength to start to have an effect, either.)
Physics is fun.