Price: $436.00

TOA A-903MK2 30W 8-Channel Modular Mixer/Amplifier

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. Eight module slots allow you to easily configure custom configurations using 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. Outputs include transformerisolated 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 mutetype 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.


Modular Eight Channel Mixer/ Amplifiers for paging, background/ foreground music distribution and music/messaging-on-hold. Proven TOA Quality and Reliability Engineered for High Performance with wide frequency response, very low noise and distortion, and excellent output regulation. Three Models: A-903MK2 (30 W), A-906MK2 (60 W), A-912MK2 (120 W) Eight Module Slots accept any combination of TOA plug-in modules for custom system configurations. 25 V, 70 V and 8 Ohm TransformerIsolated Speaker Outputs with screw terminal connector and protective cover plate (A-903MK2: 4 ohm). Direct Low-Impedance Output Mode bypasses output transformer. Dual Mute Bus permits multiple levels of paging priority using optional mute-type modules. External Mute Terminals for activating mute function with external switchclosure. Remote Master Volume Terminals for control with an external 10k ohm linear-taper potentiometer. Individual Channel and Master Volume Controls. Bass/Treble Tone Controls with tone defeat switch. Low Cut Switch to limit low frequency response. Auxiliary Output for connecting an external mixer or recording device. Insert Jacks for connecting external signal processing. Bridging Input/Output for input expansion or recording device. Normal, Clip, Power, Protect, and Signal Indicators provide unit status. Rear Panel AC Convenience Outlet for powering external equipment Turn-On Delay disconnects output during power-up. Over-current and Thermal Protection Circuitry prevents potential damage from overload, short-circuit and overheating. Volume Control Security Knobs Included (4) Optional Rack-Mount Kits UL / cUL Listed Five Year Warranty

TOA A-903MK2

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)