Boca SoundExpression 14.4VSP, User Manual

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Appendix C: Microphone and Speaker Requirements
The SE1440 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 SE1440 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 SE1440. Its sensitivity is much lower, and its frequency
response is not as suitable for this purpose.
Speaker Requirements
You can attach the SE1440 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.
Microphone and Speaker Requirements