The basic public address mixer amplifier belonging to a family of similar products with power ratings from 60W, 120W, 240W, 350W, 500W to 650W.  ARB-120 is 120W version of ARB audio mixers.

SKU: ARB-250 Categories: ,


The basic public address mixer amplifier belonging to a family of similar products with power ratings from 60W, 120W, 250W, and 550W.  ARB-250 is 250W version of ARB audio mixers.

They are featured of 3 balanced microphone inputs, 2 aux inputs and 1 EMC input. Priority muting is achieved via EMC for overriding other inputs except Mic1 on front panel. Individual gain controls are provided for Mic 1-3 and Aux 1-2, bass and treble controls and master volume control are provided for overall tone control. 70V, 100V and low impedance 4-16ohms speaker outputs are provided. Extensive protection from short-circuit, overload and high temp.


  • Mixer amplifier for paging and background music system
  • Rated power from 60W, 120W, 250W, 350W, 550W to 650W
  • 2U rack mount (less than 350W) and 3U rack mount design
  • 70V, 100V and low impedance 4-16ohm speaker output
  • Three balanced Mic input
  • Mic 1(phone jack) with VOX priority and VOX level on front panel
  • Mic 2-3 by XLR type on rear panel with phantom power
  • Two Aux Inputs and 2 line inputs for spare use
  • One EMC priority input
  •  EMC has priority over all inputs except MIC1
  • Mic 1-3, Aux 1-2 and master volume controls and bass/treble tone
  • Short circuit, overload and high temp protection
  • DC 24V available on less than 500W models
  •  Panel with/without handhold
  • Faults monitoring module, it can output short circuit signal to achieve main/spare amplifier Switch

Additional information

Weight 9.5 kg
Dimensions 48.4 × 33.5 × 8.8 cm


Rated Power Output


Speaker Outputs

70V, 100V & 4~16

Input Sensitivity & Impedance

MIC 1, 2, 3: 5mV/600 , Unbalanced phone jack input

Output Sensitivity & Impedance

MIC 2, 3: 2.5mV/2K , balanced XLR input


MIC 2, 3: 775mV/10K , Unbalanced RCA input

Frequency Response

AUX 1, 2: 350mV/10K , Unbalanced RCA input

Power Supply

2.5mV~ 75mV at 30dB


MIX OUT: 1V/470 , Unbalanced RCA output

Muting Function

Bass: 10dB at 100Hz

Gain Control

Treble: 10dB at 10KHz


50Hz~16KHz(+1dB, -3dB)

Phantom Power

MIC 1, 2, 3: 66dB, AUX 1, 2: 80dB


Less than 0.5% at 1KHz, 1/3 rated power


MIC 1 overrides other input signals with 0-30dB attenuation


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