Custom insert-type tube headphones are presented in the study. The sound source is located nearby the human ear canal and therefore the complex problem field of measuring sound sources in the human auditory canal is addressed in detail. The UD-ADU1a headphones have a frequency response of 30-13000 Hz (±10 dB) as measured with a standardized artificial ear, and their upgrade prototype demonstrate a minimal ±5 dB deviation (30-9000 Hz), both 1/3-octave smoothed. The replaceable ear-tip of the headphones attenuates background noise 15-20 dB, allowing a very precise positioning of the sound source. The non-magnetic stimulators are used for reproducing synthetic three-dimensional sounds in neuro- and psychophysiological research.
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https://aes2.org/publications/elibrary-page/?id=11206
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