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The actual dB SPL values
that define normal hearing are shown to the right. According to this
chart, I can expect a young normal hearing adult to be able to hear
a 7.5 dB SPL pure tone at 1000 Hz. I can expect that same individual
to first hear a 125 Hz pure tone when presented at 47.5 dB SPL. Again,
this difference in thresholds between 1000 and 125 Hz is an indication
of the normal difference in sensitivity between the two frequencies
and not evidence of a hearing loss at 125 Hz. |
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