Product Overview
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 A-903MK2 (30W) Modular Mixer/Amplifier is engineered for high performance with wide frequency response, very low noise and distortion, and excellent output regulation.
Outputs include transformer isolated 25V, 70V and 4Ω plus a direct low-impedance mode if non-transformer operation is required. Multiple paging priorities are easily configured using optional mute-type 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. The 900 Series Mixer / Amplifiers are UL and cUL Listed and carry a five-year warranty.
The A-903MK2 Mixer Power Amplifier controls and mixes up to eight independent input signals. The Mixer Power Amplifier delivers up to 30 watts of output power. Optional plug-in modules are available for use with mixer power amplifier to provide versatility for a wide range of operating applications.
Includes:
- Volume control Security Knobs (YA-920) x4
Features:
- 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.
- Eight Module Slots accept any combination of TOA plug-in modules for custom system configurations.
- 25V, 70V and 4Ω Transformer-Isolated Speaker Outputs with screw terminal connector and protective cover plate
- 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 10kΩ 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.
- UL / cUL Listed
- Five Year Warranty
Specifications:
- Type: 8-channel mixer power amplifier
- Power Requirement: AC mains, 120V, 60Hz
- Power Consumption: 60W
- Output Power: 30W RMS
- Power Band Width:
- (D) 20 - 20,000Hz, 0.5% THD,
- (T) 50 - 20,000Hz, 0.5% THD
- Frequency Response:
- (D) 20 - 20,000Hz, ±1dB
- (T) 20 - 15,000Hz, ±1dB, (T) 20 - 20,000Hz, +1dB, -3dB
- T.H.D: 0.02% @ 1kHz, rated output
- Inputs:
- Eight Input Ports : Each port accepts any input modules.
- One Bridging Input / Output
- Input Sensitivity / Impedance Input Port #1 to #8 : 100mV / 10kΩ
- Bridging Input/Output : 100mV / 3.3kΩ
- Preamp OUT /Power Amp IN: 1000mV into 600Ω / 1000mV, 10kΩ
- Outputs:
- (T) = Transformer: 4Ω, 25 and 70 volts, balanced, Main
- (D) = Direct Main: 8Ω, unbalanced
- Aux: 10kΩ, 1V
- Output Regulation (1kHz):
- (D) Less than 0.5dB, no load to full load
- (T) Less than 1.0dB, no load to full load
- S/N Ratio: (Band Pass 20 - 20,000Hz) Tone defeat switch on Master volume min : 90dB
- Master volume max : 77dB
- Power amplifier only : 105dB
- Tone Controls Bass : ±10dB @ 100Hz, Treble : ±10dB @ 10kHz
- 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 (60Hz, 6dB / 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°C to +60°C (12°F to 140°F)
- Finish: Black
- Dimensions (W×H×D): 420 (16.54") × 99.1 (3.90") × 318mm (12.52")
- Weight: 7.8kgs (17.20lbs)