Digital Acoustics IP7-FX, Справочное руководство

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Page 9
Microphones
The IP7-FX can receive audio through a microphone and transmit it across
the network to be played or stored. There are several types of microphones
with different pickup patterns (omni directional, unidirectional, etc.). The
IP7-FX supports Electret and Line Level Mics as well as TalkBack Speakers.
Electret Microphone
An electret microphone (sometimes referred to as un-pre-amplified mic)
transmits “mic level” audio to the IP7 -FX. To use an electret microphone:
• For best results and to minimize interference connect to the
microphone to the IP7-FX with 18-20 AWG shielded wire
• The Microphone wire must NOT be in the same jacket as the Speaker
wire!
• Connect the plus and minus leads to the IP7- FX’s J2 -1 (Mic+) and J2-2
(Mic-) terminals
• Connect the shield to the IP7-FX J2-4 (GND), but do not connect the
shield on the microphone end
Some examples of electret microphones are the ETS ML1-x series and the
Louroe x-ML series.
Line Level Microphone
A line level mic (sometimes referred to as a powered or pre-amplified
mic) transmits “line level” audio to the IP8-FX. To use a line level mic:
• Connect the Black (or Audio) lead to the J3-4 (Line In) connector
• Connect the Shield (or Ground) to the J3-6 (GND) connector
• Connect the Red (or Power) lead to the J3-7 (MIC PWR) connector
Some examples of line level microphones are the ETS SM1 series and the
Louroe Verifact series.
TalkBack Speaker
Some 8 Ohm speakers work well as a microphone. To use a speaker as a
microphone:
• Connect the two speaker leads to the J2-1 (Mic+) and J2-2 (Mic-)
connectors. The connections are polarity independent
• Set the recessed ST MIC switch (connector 9 – next to the DIN clip) to
the ST position using a small screwdriver
Some call stations only have a single speaker that is used as both a speaker
and a microphone (also known as single transducer mode). The IP7-FX can
also support this configuration in half duplex operation.