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Sound Attenuation

Dear List,
        A colleague of mine is interesting in running a monaural sound localization experiment. It is important for this experiment that he present his stimuli from a free-field speaker array, so headphones can not be used.  Our question is what would be the most effective technique for attenuating the sound in the non-listening ear? The sound stimuli will be 50Hz - 8 kHz and 40 - 70 dB.

Any information you have on how best to accomplish this attenuation, references, and advice would be greatly appreciated.

Thank you in advance,


Michael S. Gordon
Department of Psychology
University of Toronto at Mississauga
Mississauga, Ontario