A-903MK2 - 30W

A-903MK2 - 30W

A-903MK2 - 30W


The TOA 900 Series are widely recognized as the industry standard in installed sound system amplification. When reliability and performance are critical - such as in paging and music distribution for airport, hospital, and industrial sound systems - you can count on the TOA 900 Series to perform consistently, day-in and day-out.
The A-903MK2 (30 W) Modular Mixer/Amplifiers are engineered for high performance with wide frequency response, very low noise and distortion, and excellent output regulation.

UL certification

A-912MkII Overview
A-906MkII Overview

Type 8-channel mixer power amplifier
Power Requirement AC mains, 120 V, 60 Hz
Power Consumption 60 W
Output Power 30 W RMS
Power Band Width (D) 20 〜 20,000 Hz, 0.5% THD, (T) 50 〜 20,000 Hz, 0.5% THD
Frequency Response (D) 20 〜 20,000 Hz, ±1 dB
(T) 20 〜 15,000 Hz, ±1 dB, (T) 20 〜 20,000 Hz, +1 dB, -3 dB
T.H.D 0.02% at 1 kHz, rated output
Inputs Eight Input Ports : Each port accepts any input modules.
One Bridging Input/Output
Input Sensitivity /Impedance Input Port #1 to #8 : 100 mV/10 kΩ
Bridging Input/Output : 100 mV/3.3 kΩ
Preamp OUT /Power Amp IN 1000 mV into 600 Ω/1000 mV, 10 kΩ
Outputs(T)=Transformer (D)=Direct Main (T) : 4 Ω, 25 and 70 volts, balanced, Main (D) : 8 Ω, unbalanced
Aux : 10 kΩ, 1 V
Output Regulation(1kHz) (D) Less than 0.5 dB, no load to full load
(T) Less than 1.0 dB, no load to full load
S/N Ratio(Band Pass 20 〜 20,000 Hz) Tone defeat switch on Master volume min : 90 dB
Master volume max : 77 dB
Power amplifier only : 105 dB
Tone Controls Bass : ±10 dB at 100 Hz, Treble : ±10 dB at 10 kHz
Controls 8 Input gain control 1 Master gain control 1 Bass control
1 Treble control 1 Power ON/OFF switch 1 Tone defeat switch
1 Low-Cut switch (60 Hz, 6 dB/octave)
Indicators 1 Power LED, 1 Protect LED, 1 Signal LED, 1 Normal LED, 1 Peak LED
Protection Self-protection, with AC fuse (inside)
Connectors Input No.1 to No.8 : Card-edge connector
Bridging, Mixer preamp. output, Power amp. input, Aux output : RCA phono jack
Output : Screw-terminal strip
Mute, Remote VR : Screw-terminal strip
AC outlet : 3-pin grounding type
AC power cord/plug : SJT, 3-prong type
Temperature Range -10℃ 〜 +60℃ (12゜F 〜 140゜F)
Finish Black
Dimensions(W×H×D) 420(16.54") × 99.1(3.90") × 318(12.52") mm
Weight 7.8 kg (17.20 lb.)
Accessories Volume control cover (YA-920)……4
Option Rack mouting bracket (MB-25B)

High Performance
The A-903MK2 (30 W), A-906MK2 (60 W) and A-912MK2 (120 W) Modular Mixer/Amplifiers are engineered for high performance with wide frequency response, very low noise and distortion, and excellent output regulation.

Modular Design
Eight module slots allow you to easily configure custom configurations choosing from over fifty TOA plug-in modules with an extensive array of features and connector types. You can increase the input capacity by connecting a second mixer or mixer/amplifier to the rear-panel Bridge In/Out jack.

Versatile Features
Outputs include transformer isolated 25 V, 70 V and 8 ohm (A-903MK2: 4 ohm) plus a direct low-impedance mode if non-transformer operation is required. Multiple paging priorities are easily configured using optional mute-type modules activated by external switch-closure or mute-send modules. Pre-Out/Power-In jacks allow connection of external signal processing between the mixer and amplifier sections. Other features include protection circuitry, auxiliary output, bass/treble controls and remote master volume terminals. The 900 Series Mixer/Amplifiers are UL and cUL Listed and carry a five year warranty.

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