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Headphones for localization tests, again

Dear list,

I wrote a month ago asking about headphone transfer functions for
performing auditory localization tests. Finally we decided to buy an
in-ear headphone,the Etymotic ER-2, in order to validate our customized
HRTF model. But..does anyone know about another in-ear headphone less
expensive and with similar or at least acceptable performance?


Sergio Rodriguez
Signal Processing Laboratory
University of São Paulo