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TOA 900 Series Modular Mixer/Amplifiers


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 TOA 900 Series are modular mixer/amplifiers designed for applications such as paging and music distribution and industrial sound systems. Engineered for high performance, the A-902MK2 (30W), A-906MK2 (60W), and A-912MK2 (120W) have a wide frequency response with very low noise and distortion. These models also feature excellent output regulation.

The 900 Series mixer/amps are used in our contracting business all the time. They are perfect when you need lots of inputs, but need to be able to customize and taylor them to meet the demands of the job. This unique modular design makes the 900 Series the most versatile 70V mixer/amplifiers in the industry, period.

Modular Design

image of the TOA A900 Series viewed from the back.

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. Pre-Out/Power-In jacks allow connection of external signal processing between the mixer and amplifier sections.

TOA 900 Series Mixer/Amps Features Include:

  • 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) Specs
  • Eight Module Slots accept any combination of TOA plug-in modules for custom system configurations.
  • 25 V, 70 V and 8 Ohm Transformer-Isolated 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 switch closure.
  • 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 Kit, MB-25B
  • UL / cUL Listed
  • Five Year Warranty