Sidetone Control; Mic Type Control - Pro Intercom MS300 Instructions

The next control in this segment is marked with a symbol:
Sidetone every day when you use the telephone. It overcomes the brain's conviction that if
you can't hear yourself, nobody else can either. It is a small amount of the audio from your
own microphone fed back into your earspeaker. You need just enough Sidetone and no
more. The amount varies from person to person.
Sidetone is used in two ways with an MS300:
First, if you are using a headset, tiny adjustments of the little recessed control can make
your listening more comfortable. Remember, Sidetone only affects what you hear, it does
not change the level that others on the circuit hear. The second, and most dramatic use of
Sidetone is to permit the MS300 to be used with a noise-canceling gooseneck microphone
and the built-in loudspeaker in a full simultaneous talk/listen mode (duplex) hands-free.
Reducing Sidetone also reduces the level of your own voice coming out of the loudspeaker,
thus delaying the onset of feedback. This allows you to raise the level of the audio coming
from those with whom you are
Using a noise-canceling gooseneck microphone cuts back on the amount of audio coming
from the loudspeaker and the environment which is getting back into the audio path via
the microphone. The result is that the MS300 can be used in a fairly quiet environment
to talk and listen to other stations without a headset and without pressing buttons. The
Sidetone control requires very tiny adjustments to find that perfect spot where speech is
loud enough, and feedback does not occur. The default position of the control is 12 o'clock
which is usually acceptable for most
The last control in this segment is a button marked Mic Type.
This control sets the circuitry to accommodate either a dynamic or an electret microphone,
whether it is part of a headset/handset or is a gooseneck microphone. An LED indicates
which setting is active. It is essential that you use a professional communications headset,
handset or microphone with the MS300. The earspeakers in the headset should be between
200 and 400W, and the microphone should be either a dynamic from 150 to 250W, or an
electret between 1.2 and 1.8 kW. Inexpensive headsets commonly sold for connecting to
computer sound cards are not acceptable for this purpose.
communicating.
headsets.
O v e r r i d e
A c t i v e
'Sidetone'. You experience
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