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RTS Intercom Systems

Intercom Expansion Station


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The ES-4000A is an expansion station for the US-2002 user station. It interfaces four additional intercom channels to the US-2002, and it provides talk, listen and call buttons for the four additional channels. There are also four additional program inputs on the back of the ES-4000A, one for each added channel. Up to four ES-4000A expansion stations may be connected to the US-2002 to add up to 16 channels (18 channels total). The ES-4000A typically utilizes the US-2002 microphone and speaker (or microphone headset) for communication with the added channels. The ES-4000A also has individual speaker outputs for independent monitoring of one or more of the four channels if desired.

• Binaural (Stereo) Inputs
• Clear-Com Compatible
• Compatibility & Flexibility
• Dedicated Program Inputs
• Mic Kill
• Overload/Short-Circuit Protection
• Simplified Expansion


Input Impedance 300 ?
Weight 1.3 lbs (0.59 kg)
Output Impedance 1000 ohms nominal
Frequency Response EXP IN to/from Channel, EXP IN to/from EXP OUT, Channel to Speaker: 200 Hz to 8 kHz +1/-3 dB
Width 8.19" (20.8 cm)
Common Mode Rejection Ratio greater than 50 dB
Storage Temperature -20
Depth 10" (25.4 cm)
Height 1.75" (4.45 cm)
Operating Temperature -15
Output Level 1 Vrms nominal
Gain Range / Control (program Input to channel output, with 100 mVrms input): 25
Total Harmonic Distortion (THD) Less than 0.5 %
Power requirement Voltage: Phantom Power: 24 VDC nominal (12 to 30 VDC) Local Power (with PS-L Wall-pack Power Supply or equivalent): 14 to 15 VDC Current: 65 mA, quiescent, 150 mA maximum
Signal-to-Noise Ratio less than -70 dB

Item Includes

Standard Manufacturer's Warranty

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