^How does the Smyth Realizer correct for individual HRTF?
Surround Sound headphones - Page 2
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Basically, you put some earbud microphones into your ears, connect the Realiser to a surround speaker system, and sit in the right place as it plays the test tones. This creates a PRIR (Personalized Room Impulse Response, or something like that). It's technically not a pure HRTF because it's also recording a set configuration of speakers and the acoustic effects of the room itself, which I feel ultimately holds the Realiser back, but that's the most personalized system we have right now 'til someone figures out how to construct accurate HRTFs with nothing more than three pictures of one's head (front and both sides).
Of course, this means that you need access to a decent surround speaker system to make the recording in the first place, which likely adds to the Realiser's cost. However, chances are if you're spending that much on a headphone surround processor, then you'd probably rationalize it by saying that you can record yourself listening to far more expensive speaker systems with it and get the mostly the same experience at home.
There's an additional step that requires the earbud microphones to be worn along with your headphones so that it's calibrated to the headphones' sound signature, but that doesn't require a home theater speaker system.
Edited by NamelessPFG - 3/20/13 at 12:33pm