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The PS-704 is a four-channel, single-rack-space intercom power supply that features Clear-Com’s “fail-safe” design for maximum reliability. The power supply delivers 2 amps at 30 volts, supplying power for one to four channels of intercom.

Note: Access the Encore Power Supply Calculator to estimate power requirements for analog partyline systems.


  • Provides up to 2 amps at 30 Volts
  • Supports up to 40 beltpacks, 10 speaker stations, or 12 headset stations
  • Exclusive Intelligent Fault/Overload Sensing (IFOS) for system reset
  • Switchable line terminations for each channel
  • Built-in test tone generator for set up and diagnostics
  • UL listed and CE certified
  • Line and load regulated
  • Short-circuit protected

Item Code



Program Line Input

Maximum Level before Clipping: >= 20dBu

Input Impedance: >= 5K

Frequency Response
Program Input - Partyline: 200 - 20kHz ± 3dB
Max Distortion
Program Input - Partyline: <= 0.2%
Program Mic Input - Partyline: < -70dBu
Max Gain
Program Input - Partyline: >= -16dB
Min Gain
Program Input - Partyline: <= -20dB
Mains Power

Input Voltage Range: 100 - 240V AC

Input Frequency Range: 50 - 60Hz

Input Power: <= 60V AC

Output Voltage: 30V DC ± 0.5V

Output Current per Channel (Continuous): 1.2A

Output Current per Channel (Peak): 2A (Do not exceed the 1.2A rating for more than 2 seconds per 1 minute period)

Short Circuit Recovery Time (1st short):<= 0.5 sec Short Circuit Recovery Time: >= 20 shorts in 20sec) <= 20 sec

32° - 122°F (0 - 50°C)

1.75 x 19 x 7.5in (HxWxD)

(44 x 483 x 190mm)

6.16lbs (2.80kg)


Ready to get

Our team of communications professionals are here to support your project. Contact us today to start designing your custom intercom solution.

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