>Question: what sort of speaker did they use to send sounds in (presumably)
>the 15-30KHz region. Unless they used specialised ultrasonic transducers
>there is little knowing what you were hearing. [Gaz is tempted to mention
>sub-harmonics but thinks that is bull and thinks he is in enough trouble
>with
>the ongoing Linux thread]. Me thinks their speakers were c**p, or rather
>incapable of reproducing a clean 22KHz or higher signal.
>
>There is a reason any hifi speaker has 2 or 3 (at least) elements-- each
>can only
>give good reproduction over a limited frequency range. Anyone taking these
>"how high can we hear" tests should ask
>a) what speakers they use
>b) how high they crank up the sound pressure level with frequency
>c) couldn't we all hear a tone of 25KHz if blasted at 150dB
Ok, for starters, the current JBL studio monitors (LSR 32) are flat (in
frequency response to +1dB/-1.5dB) from 60Hz to 22kHz, and are 3dB down at
54Hz.
besides which who says we use our ears to detect these "inaudible"
frequencies, we can't hear a 5Hz tone, but we know when it's happening.
Christopher Spalding
Genius, generally excellent and gifted person.
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