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Features
1. Intercom Talk Keys: Momentary or latching (hands-free) operation possible.
2. Call Keys: Used to call intercom channels and to indicate incoming calls.
3. Intercom Listen Keys: Momentary or latching operation possible.
4. Local Power Jack: The ES4000A can be powered from the intercom channels
via the CHANNEL 3-6 OUTPUTS connector (9). Alternatively, an optional
PS-L wall-pack accessory may be used to power the ES4000A from an AC out-
let. When power is sensed at the local power jack, the ES4000A automatically
disconnects from channel power. This means more channel power is available
for additional belt packs.
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Important: The Local Power Jack only provides power to the ES4000A: it can-
not be used to power the intercom system.
5. EXP IN and EXP OUT Connectors: The EXP IN connector receives the micro-
phone audio signal from the US2000A, and it sends the monaural mix of the
four ES4000A channels to the US2000A speaker or headset. The EXP OUT con-
nector connects to the EXP IN connector of an additional ES4000A. Up to 4
ES4000A Expansion Stations may be daisy chained with the EXP IN and EXP
OUT connectors. An EXP IN/OUT cable is supplied with each ES4000A.
6. SPEAKERS: Usually, the listen mix of all 4 ES4000A channels is sent to the
US2000A speaker or headset via the EXP IN connector. Alternatively, speakers
may be connected to one or more of the speaker outputs of the ES4000A.
7. BAL / UNBAL Switch: This selector switch sets the ES4000A for compatibility
with either Audiocom or Clear-Com* channel connector pin-outs, channel
power requirements, and call signaling requirements.
8. Program Inputs Connector and Trimmers: Each intercom channel has its own
program input and level adjust trimmer. For each program input, there is an inter-
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* Brand names mentioned are the property of their respective companies.