• TOA A-903MK2 80-Watt Single-Channel Power Amplifier
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TOA A-903MK2 UL 900 Series 8-Channel Mixer Power Amplifier

TOA A-903MK2 UL 900 Series 8-Channel Mixer Power Amplifier

SoundPro Item: 50079 | Part Number: A-903MK2 UL

$642.00
$795.00 $642.00
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MSRP: $795.00 | MAP: $642.00

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  • Eight Modular Input Ports Accept Optional Plug-In Modules For Application-Specific Flexibility
  • Transformer And Direct Outputs Support 4-Ohm, 25V, 70V, And 8-Ohm Speaker Systems
  • Individual Input Gain Controls Plus Master Gain For Precise Multi-Source Mixing
  • Bass And Treble Tone Controls With Tone-Defeat Switch For Signal Transparency
  • Low-Cut Filter Reduces Unwanted Low-Frequency Content At The Source
  • Five-LED Front Panel Enables Fast Status Verification During Install And Maintenance
  • Self-Protection Circuit With Internal AC Fuse Guards Against Fault Conditions
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The TOA A-903MK2 UL is an eight-channel mixer power amplifier designed for permanent commercial audio installations where centralized control of multiple input sources and distributed speaker outputs are required. Running on 120V AC mains and delivering 30 watts RMS, the unit supports both transformer-coupled 25V and 70V outputs alongside a direct 8-ohm unbalanced output, making it compatible with a wide range of distributed speaker systems used in corporate, retail, hospitality, and institutional environments.

Eight module ports accept optional plug-in input modules, giving integrators the flexibility to tailor the signal chain for each project without swapping the amplifier chassis. Individual input gain controls, a master gain control, bass and treble tone controls with a tone-defeat switch, and a low-cut filter at 60Hz give the system technician practical on-unit control without an external processor. A bridging input and output, a preamp output, a power amp input, and an auxiliary output extend routing options for more complex signal architectures.

Front-panel LED indicators for power, protection, signal, normal, and peak status allow quick status verification during commissioning and routine maintenance. The self-protection circuit and internal AC fuse protect the amplifier and connected equipment. Rated from negative 10 to positive 60 degrees Celsius, the A-903MK2 UL is suitable for equipment room environments and mounts in a standard 2U rack space with an optional mounting bracket.

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Specifications

Audio
Output Power
30 W RMS
Power Bandwidth
(D) 20 to 20,000 Hz, 0.5% THD; (T) 50 to 20,000 Hz, 0.5% THD
Frequency Response
(D) 20 to 20,000 Hz, ±1 dB; (T) 20 to 15,000 Hz, ±1 dB; (T) 20 to 20,000 Hz, +1 dB, -3 dB
Total Harmonic Distortion
0.02% at 1 kHz, rated output
Signal To Noise Ratio
Master volume min: 90 dB; Master volume max: 77 dB; Power amplifier only: 105 dB
Tone Control
Bass: ±10 dB at 100 Hz; Treble: ±10 dB at 10 kHz
Inputs
Input Ports
Eight; each port accepts any input module
Bridging Input/Output
1
Input Sensitivity/Impedance (Ports 1-8)
100 mV / 10 kOhm
Input Sensitivity/Impedance (Bridging)
100 mV / 3.3 kOhm
Preamp OUT / Power Amp IN
1000 mV into 600 Ohm / 1000 mV, 10 kOhm
Outputs
Main Output (Transformer)
4 Ohm, 25V and 70V, balanced
Main Output (Direct)
8 Ohm, unbalanced
Aux Output
10 kOhm, 1 V
Output Regulation at 1 kHz (Direct)
Less than 0.5 dB, no load to full load
Output Regulation at 1 kHz (Transformer)
Less than 1.0 dB, no load to full load
Connectivity
Input Connectors (Ports 1-8)
Card-edge connector
Bridging / Preamp Output / Power Amp Input / Aux Output
RCA phono jack
Speaker Output
Screw-terminal strip
Mute / Remote VR
Screw-terminal strip
AC Outlet
3-pin grounding type
AC Power Cord
SJT, 3-prong type
Controls
Input Gain Controls
8
Master Gain Control
1
Bass Control
1
Treble Control
1
Tone Defeat Switch
1
Low-Cut Switch
60 Hz, 6 dB/octave
Power On/Off Switch
1
Indicators
LEDs
Power, Protect, Signal, Normal, Peak
Electrical
Power Source
AC mains, 120 V, 60 Hz
Power Consumption
60 W
Environmental
Operating Temperature
−10 °C to +60 °C (12 °F to 140 °F)
Construction
Finish
Black
Dimensions
Width
420 mm (16.54")
Height
99.1 mm (3.90")
Depth
318 mm (12.52")
Weight
Unit Weight
7.8 kg (17.20 lbs)
Included Items
Volume Control Cover (YA-920)
4
Identifiers
Optional Accessory
MB-25B

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