SoundExpression SE14SRS, Руководство пользователя

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SoundExpression
Appendix C: Microphone
and Speaker Requirements
The SoundExpression is equipped with
microphone (MIC) and speaker jacks
(SPK) for use with headset, speakers, and
microphone. The microphone can be used
to record outbound messages as well as
sound files. These messages can also be
recorded with a telephone attached to the
modem. However, a microphone is
recommended for better quality
recordings. You may use a combination
headphone and microphone or a separate
microphone and speaker(s).
Microphone Requirements
The microphone element should be of the
electret type also known (incorrectly) as a
condenser type. The microphone in most
telephone handsets and headsets are of
this type. The SoundExpression was
designed for a microphone sensitivity of -
64 dBspl. Other microphone sensitivities
work equally well, with only a subjective
difference in loudness. Carbon
microphone elements will also work, but
don’t offer the quality of the electret.
Another common microphone element is
the dynamic type which will work with
the SoundExpression. Its sensitivity is
much lower, and its frequency response is
not as suitable for this purpose.
Speaker Requirements
You can attach the SoundExpression to a
high-quality external speaker or the
earpiece of a handset or headset. The
external speaker must have an impedance
rating of 8 ohms or more.