Originally Posted by Davesrose
They use a dummy head because the helix of your ear influences your perception of tonality. Treble frequencies get more reflection from the pinna of your ear: hence why all the science behind headphone manufacturer's R&D!! That and the accoustics of a room totally influence how we percieve sound.http://en.wikipedia.org/wiki/Pinna#Pinna_Notch
Yes I've heard this argument before. But superaural headphones, which make up the majority of headphones, fit around and contain the ears. So the head-related transfer function is already built-in, most of it anyway. Therefore in theory, we would want a flat response just like a speaker. If we use the dummy head, it might be closer to what we actually hear, but no one knows what we actually should be hearing so we have nothing to compare to, whereas for a standard FR measurement (no dummy head) we know we should be aiming for flat. let the ears do its own processing and we are only interested in the preprocessed frequency response. i've been emailing AKG and have been comparing headphones to reference speakers, and am convinced that the K701s are the most reference-accurate headphones ever made (that I have heard).
i don't see how the acoustics of the room effect headphones. room effects are nasty for high output speakers heard from a distance, but if you listen to speakers nearfield with medium output, it's not really an issue even in smaller rooms.