47. MRH14-01-Jan2014-P.pdf - page 64

Frequency response is usually
calculated as the frequencies
where the curve drops below
a level 10 dB below the peak.
This speaker peaks about 85 dB
about 4000 Hz. So, the places
where it drops below 75 dB
will be the frequency response
(about 225 Hz to about 16,000
Hz). 
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MRH-Jan 2014