THE TOA 900 SERIES are widely
recognized as the industry standard
in installed sound system amplifi-
cation. When reliability and per-
formance 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 transformer-
isolated 25 V, 70 V and 8 ohm
(A-903MK2: 4 ohm) plus a direct
low-impedance mode if non-trans-
former operation is required.
Multiple paging priorities are easily
configured using optional mute-
type modules activated by exter-
nal 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, auxil-
iary 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 excel-
lent 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 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 over-
heating.
Volume Control Security Knobs
Included (4)
Optional Rack-Mount Kits
UL / cUL Listed
Five Year Warranty
H
I G H L I G H T S
O
P T I O N A L
A
C C E S S O R I E S
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
9 0 0
S
E R I E S
M
I X E R
/
A
M P L I F I E R S
:
A - 9 0 3 M K 2
A - 9 0 6 M K 2
A - 9 1 2 M K 2
