TOA A-903MK2 UL, A-906MK2 UL, A-912MK2 UL Users Manual
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.
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 combi-
nation 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 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
H
IGHLIGHTS
O
PTIONAL
A
CCESSORIES
Plug-in Modules (see individual module specifications)
MB-25B Rack-mount Kit (2 RU)
PF-511 Perforated Rack Panel (2 RU)
YA-920 Volume Control Security Knob
900 Series Module Guide available from http://www.toaelectronics.com
900
S
ERIES
M
IXER
/
A
MPLIFIERS
:
A-903MK2
A-906MK2
A-912MK2
A
PPLICATIONS
A/V Rentals
Airports
Audio/Visual
Auditoriums / Theatres
Banks
Bars / Lounges / Nightclubs
Boardrooms
Business Music
Conference Facilities
Convenience Stores
Educational Facilities
Fitness Clubs / Gymnasiums
Hotels / Hospitality
Houses of Worship
Industrial / Warehouses
Museums
Music Distribution
Offices
Public Address
Restaurants
Retail Stores
Theme Parks
Training Rooms
Type 8-channel modular mixer/amplifier
Output Power A-903MK2: 30 W RMS; A-906MK2: 60 W RMS
A-912MK2: 120 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 0.02% at 1k Hz, rated output
Distortion
Inputs 8 input ports: every port accepts any input module
1 Bridging Input/Output
Input Sensitivity Please refer to 900 Series module specifications.
& Impedance Bridging Input/Output: 100 mV / 3.3k Ω
Pre-amp. Out/ 1 V, 600 Ω / 1 V, 10k Ω
Power Amp. In
Outputs Main (T): 8 Ω, 25 V & 70 V, balanced
(T)=Transformer
Main (D): 4 Ω, unbalanced
(D)=Direct
Aux: 1 V, 10k Ω
Output Regulation (D): Less than 0.5 dB, no load to full load
(1k Hz) (T): Less than 1.0 dB, no load to full load
Dynamic Range Master volume set to min.: 90 dB
(Band Pass: 20 - 20k Hz,
Master volume set to max.: 77 dB
with Tone Controls centered)
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 A-903MK2: 60 W; A-906MK2: 100 W; A-912MK2: 180 W
Temperature Range 12° F to 140° F (-10° C to +60° C)
Color Black
Dimensions
(W x H x D) A-903MK2: 16.5” x 3.9” x 12.5” (420 x 99.1 x 318 mm)
A-906/912MK2: 16.5” x 3.9” x 14.1” (420 x 99.1 x 358 mm)
Weight
(without modules) A-903MK2: 17.2 lbs (7.8 kg); A-906MK2: 21.2 lbs (9.6 kg)
A-912MK2: 25.1 lbs (11.4 kg)
Other Features Output connects approx. 5 seconds after switching power on.
900 SERIES
MIXER/AMPLIFIERS
Tel: 800-733-7088
Fax:800-733-9766
www.toaelectronics.com
S
PECIFICATIONS
Visit www.toaelectronics.com to download:
900 Series Architect and Engineering Specifications
900 Series Installation Manual
900 Series CAD Files
900 Series Module Guide
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