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Audio & Sound Equipment » Amplifiers » Mixer Amplifiers, Commercial, Paging, 70v » Mixer Amplifiers, 1 to 30 Watts

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TOA A903MK2
Modular Mixer / Amplifier

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TOA A903MK2

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 (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.

The 900 Series Mixer/Amplifiers are UL and cUL Listed and carry a five year warranty.

Features:

Modular design allows fast and easy custom configurations.
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 unmatched flexibility.
30, 60 or 120 Watts RMS Output Power.
Dual Mute Bus permits multiple levels of paging priority using optional mute-type modules.
Remote Master Volume controlled with an external 10k ohm linear-taper potentiometer.
25 V, 70 V and 4/8 Ohm Speaker Outputs with screw terminal connector and protective cover plate.
Protection Circuitry prevents potential damage from overload, short-circuit, DC offset or overheating.
Front Panel Features:

Individual Channel and Master Volume Controls.
Bass/Treble Tone Controls with Tone Defeat Switch.
Low Cut Switch to limit low frequency response.
Normal, Peak, Power, Protect, and Signal LEDs provide instantly recognizable status indication.

Rear Panel Features:

Auxiliary Output for connecting an external mixer or recording device.
Pre-amp. Out / Power Amp. In Insert Jacks for connecting external signal processors.
Bridging Input/Output Jack for fast and easy system expansion.

Volume Control Security Covers included (4), model YA-920.
Optional Rack-Mount Kit, model MB-25B (2 RU).
UL / CSA Listed.
Five Year Warranty.

Specifications:

Type: 8-channel modular mixer/amplifier
Output Power: 30 W RMS
Power Bandwidth: (D) 20 - 20k Hz, 0.5% THD; (T) 50 - 20k Hz, 0.5% THD
Frequency Response:

(D) 20 - 20k Hz, ±1 dB
(T) 20 - 15k Hz, ±1 dB
(T) 20 - 20k Hz, +1 dB / -3 dB

Total Harmonic Distortion: 0.02% at 1k Hz, rated output
Inputs: 8 input ports: every port accepts any input module; 1 Bridging Input/Output
Bridging Input/Output: 100 mV / 3.3k Ohms
Pre-amp. Out/ Power Amp. In: 1 V, 600 Ohms / 1 V, 10k Ohms
Outputs:

Main (T): 8 Ohms, 25 V & 70 V, balanced
Main (D): 4 Ohms, unbalanced
Aux: 1 V, 10k Ohms

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

Dynamic Range:

Master volume set to min.: 90 dB
Master volume set to max.: 77 dB
Power amplifier only: 105 dB

Tone Controls: Bass = ±10 dB at 100 Hz; Treble = ±10 dB at 10k Hz
Indicators: Normal, Peak, Power, Protect, and Signal LEDs
Protection: Self-protection, with internal AC fuse
Power Consumption: 60 W
Temperature Range: 12° F to 140° F (-10° C to +60° C)
Color: Black
Dimensions (W x H x D): 16.5” x 3.9” x 12.5” (420 x 99.1 x 318 mm)
Weight (without modules): 17.2 lbs (7.8 kg)
Other Features: Output connects approx. 5 seconds after switching power on.

(T) = Transformer
(D) = Direct

TMGR# A903MK2

	TOA MB25B Rack Mount Kit for 900-Series Amps Rack-mount kit for use with TOA 900-Series modular mixer / amplifiers. Usually ships in 1-2 business days List Price: $38.00 Our Price $23.07 You save 39%! Usually ships in 1-2 business days
	TOA YA920 Volume Cover Volume Control Cover for 900MK2 Series, Black. Usually ships in 1-2 business days List Price: $4.00 Our Price $1.99 You save 50%! Usually ships in 1-2 business days
	TOA M01F Female XLR Microphone Input For balanced, low impedance mics. Choose from four connector types: female XLR, male XLR, 1/4” phone jack or screw terminal. Usually ships in 1-2 business days List Price: $104.00 Our Price $63.13 You save 39%! Usually ships in 1-2 business days
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	TOA T01S 600 ohm Balanced Line Output, Screw Terminal For transformer-isolated output of mixing bus signal to feed other mixers, amps and tape recorders. (Functions only in A-900MK2, M-900MK2 and W-900A Series.) Usually ships in 1-2 business days List Price: $114.00 Our Price $56.79 You save 50%! Usually ships in 1-2 business days
	TOA T02S Aux-Input / Bal-Output (Music-on-hold) For unbalanced, line level equipment. Transformer-isolated output of module’s input signal for feeding remote equipment such as mixers, amps, tape recorders and telephone system music-on-hold inputs.Specifications: Controls / Functions:I ... Usually ships in 2-3 weeks List Price: $136.00 Our Price $63.06 You save 54%! Usually ships in 2-3 weeks Need it sooner? Call us!
	TOA V01S Remote Master Volume Control Module (VCA) Features: Voltage controlled amplifier (VCA) for applications requiring preset remote master volume control Line input and output connect to host amplifier's Preamp output and Power Amp input 24 VDC output and Control input ... Usually ships in 2-3 weeks List Price: $92.00 Our Price $51.97 You save 44%! Usually ships in 2-3 weeks Need it sooner? Call us!
	TOA U43R Stereo Input Module w/MuteSend For unbalanced, line level equipment such as AM/FM tuners, tape decks and CD players. Signal at input terminals activates mute bus. Choose from two connector types: dual RCA jacks with passive summing or removable terminal ... Usually ships in 1-2 business days List Price: $86.00 Our Price $52.20 You save 39%! Usually ships in 1-2 business days
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A900-Series Spec. Sheet

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