TOA A-903MK2 / A-906MK2 / A-912MK2 Modular Mixer Amplifiers – 30W to 120W, 8-Slot Configurable Design
The TOA A-903MK2 (30W), A-906MK2 (60W), and A-912MK2 (120W) Modular Mixer/Amplifiers are high-performance audio solutions designed for paging, background/foreground music, and music-on-hold systems. Featuring wide frequency response, low noise and distortion, and excellent output regulation, these amplifiers offer exceptional sound clarity and reliability.
Each model includes eight module slots for custom system configurations using TOA's versatile plug-in modules, allowing for a wide range of input and output types. The rear-panel Bridge In/Out jack enables system expansion, while transformer-isolated speaker outputs (25V, 70V, 8Ω; A-903MK2 also supports 4Ω) and direct low-impedance mode provide installation flexibility.
Key features include dual mute bus for paging priority, Pre-Out/Power-In jacks for external processing, bass/treble controls, remote volume terminals, and protection circuitry. Additional conveniences include volume control security knobs, status indicators, and a rear-panel AC outlet for auxiliary equipment. UL/cUL listed with a 5-year warranty, these mixer/amplifiers are ideal for schools, offices, houses of worship, and commercial installations.
A-912MK2 SPECIFICATIONS
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Type
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8-channel mixer power amplifier
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Power Requirement
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AC mains, 120 V, 60 Hz
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Power Consumption
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180 W
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Output Power
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120 W RMS
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Power Band Width
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(D) 20 〜 20,000 Hz, 0.5% THD, (T) 50 〜 20,000 Hz, 0.5% THD
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Frequency Response
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(D) 20 〜 20,000 Hz, ±1 dB
(T) 20 〜 15,000 Hz, ±1 dB, (T) 20 〜 20,000 Hz, +1 dB, -3 dB
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T.H.D
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0.02% at 1 kHz, rated output
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Inputs
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Eight Input Ports : Each port accepts any input modules.
One Bridging Input/Output
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Input Sensitivity /Impedance
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Input Port #1 to #8 : 100 mV/10 kΩ
Bridging Input/Output : 100 mV/3.3 kΩ
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Preamp OUT /Power Amp IN
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1000 mV into 600 Ω/1000 mV, 10 kΩ
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Outputs(T)=Transformer (D)=Direct
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Main (T) : 8 Ω, 25 and 70 volts, balanced, Main (D) : 4 Ω, unbalanced
Aux : 10 kΩ, 1 V
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Output Regulation(1kHz)
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(D) Less than 0.5 dB, no load to full load
(T) Less than 1.0 dB, no load to full load
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S/N Ratio(Band Pass 20 〜 20,000 Hz) Tone defeat switch on
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Master volume min : 90 dB
Master volume max : 77 dB
Power amplifier only : 105 dB
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Tone Controls
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Bass : ±10 dB at 100 Hz, Treble : ±10 dB at 10 kHz
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Controls
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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)
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Indicators
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1 Power LED, 1 Protect LED, 1 Signal LED, 1 Normal LED, 1 Peak LED
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Protection
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Self-protection, with AC fuse (inside)
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Connectors
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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
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Temperature Range
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-10℃ 〜 +60℃ (12゜F 〜 140゜F)
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Finish
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Black
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Dimensions(W×H×D)
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420(16.54") × 99.1(3.90") × 358(14.09") mm
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Weight
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11.4 kg (25.13 lb.)
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Accessories
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Volume control cover (YA-920)……4
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Option
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Rack mounting bracket (MB-25B)
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