Originally Posted by MichaelJHuman
If it's not a powered mixer, you can't use it as an amp. It's just a mixer tben. Google it.
Here is what I found:
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 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