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: [phone]

Fax:[phone]

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

900 SERIES
MIXER/AMPLIFIERS

Tel: [phone]
Fax:[phone]
www.toaelectronics.com

M

ODULE

S

ELECTION

Model Type Description

M-01F MIC Microphone Input Module, Balanced, 200 Ω, Lo/Hi-Cut Filters, Female XLR
M-01M MIC Same as M-O1F with Male XLR
M-01P MIC Same as M-O1F with Phone Jack
M-01S MIC Same as M-O1F with Screw Terminals
M-03P MIC Microphone Input Module, HiZ, Unbalanced, 50k Ω, Lo/Hi-Cut Filters, Phone Jack
M-11S MIC Microphone Input Module, Balanced, 200 Ω, Lo/Hi-Cut Filters, Mute-Receive, Screw Terminals
M-21S MIC Microphone Input Module, Balanced, 200 Ω, Lo/Hi-Cut Filters, Remote Vol. Control, Screw Terminals
M-41S MIC Microphone Input Module, Balanced, 200 Ω, Lo/Hi-Cut Filters, Mute-Send, Removable Terminal Block
M-51F MIC Microphone Input Module, Balanced, 200 Ω, Lo-Cut Filter,Voice Gate, Female XLR
M-51S MIC Same as M-51F with Screw Terminals
M-61F MIC Microphone Input Module, Balanced, 200 Ω, Lo/Hi-Cut Filters, Compressor,Female XLR
M-61S MIC Same as M-61F with Screw Terminals
B-01F LINE Balanced Line Input Module, 10k Ω Transformer,Female XLR
B-01S LINE Balanced Line Input Module, 10k Ω Transformer,Screw Terminals
B-11S LINE Balanced Line Input Module, 10k Ω Transformer,Mute-Receive,Screw Terminals
B-21S LINE Balanced Line Input Module, 10k Ω Transformer,Remote Volume Control, Screw Terminals
B-41S LINE Balanced Line Input Module,10k Ω Transformer, Mute-Send, Removable Terminal Block
L-01F LINE Line Matching Input Module, 600 Ω Transformer,Balanced,Female XLR
L-01S LINE Same as L-01F with Screw Terminals
L-11S LINE Line Matching Input Module, 600 Ω Transformer, Balanced, Mute-Receive, Screw Terminals
L-41S LINE Line Matching Input Module, 600 Ω Transformer, Balanced, Mute-Send, Scew Terminals
U-01F LINE Line Input Module, Unbalanced, 220k Ω, Female XLR
U-01P LINE Same as U-01F with Phone Jack
U-01R LINE Same as U-01F with RCA Jack
U-01S LINE Same as U-01F with Screw Terminals
U-03R LINE Stereo Line Input Module, Lo/Hi-Cut Filters, Stereo Summing Dual RCA Jacks
U-03S LINE Line Input Module, Lo/Hi-Cut Filters, Screw Terminals
U-11R LINE Line Input Module, Unbalanced, 220k Ω, Mute-Receive, RCA Jack
U-11S LINE Line Input Module, Unbalanced, 220k Ω, Mute-Receive, Screw Terminals
U-12S LINE Line Input Module, Unbalanced, 220k Ω, Variable Mute-Receive Depth,Screw Terminals
U-13R LINE Same as U-03R with Mute-Receive
U-13S LINE Same as U-03S with Mute-Receive
U-21S LINE Line Input Module, Unbalanced, 220k Ω, Remote Volume Control, Screw Terminals
U-43R LINE Same as U-03R with Mute-Send
U-43S LINE Same as U-03S with Mute-Send
U-61S LINE Line Input Module, Unbalanced, 220k Ω, Compressor,Screw Terminals
E-03R SPECIAL FUNCTION 900 Series Processor Module for F-121C/CM Speakers, Dual RCA Jacks
E-04R SPECIAL FUNCTION 900 Series Processor Module for H-1 Speakers, Dual RCA Jacks
E-05R SPECIAL FUNCTION 900 Series Processor Module for H-2/H-2WP Speakers, Dual RCA Jacks
E-06R SPECIAL FUNCTION 900 Series Processor Module for H-3/H-3WP Speakers, Dual RCA Jacks
E-07S SPECIAL FUNCTION 900 Series Low Pass Filter Output Module for FB-100 and HB-1,Removable Terminal Block
S-01S SPECIAL FUNCTION Signal Generator Module, 1 kHz Sine Wave,Screw Terminals
S-02S SPECIAL FUNCTION Signal Generator Module, Buzzer/Yelp,Screw Terminals
S-04S SPECIAL FUNCTION Signal Generator Module, 8 Selectable Tones, Screw Terminals
T-01S SPECIAL FUNCTION Line Output Module,Balanced,600 Ω,Screw Terminals
T-02S SPECIAL FUNCTION Line Input Module for Music-on-Hold,Unbalanced,220k Ω Input, 600 Ω Balanced Output, Screw Terminals
T-12S SPECIAL FUNCTION Same as T-02S with Input Mute-Receive

TOA E

LECTRONICS

, INC.

601 G

ATEWAYBLVD

., S

UITE

300

S

OUTHSANFRANCISCO

, CA 94080
TEL: [phone]
FAX: [phone]

www.toaelectronics.com

900 S

ERIES

M

IXER

/

A

MPLIFIERS

The two types of muting modules,MUTE-RECEIVE and MUTE-SEND,have mute function circuitry that connects to two common "MUTE" buses,and one common
"GROUND" bus when installed in an A-900MK2 mixer/amplifier or M-900MK2 mixer/pre-amplifier. A "BUS" is simply an internal wire that connects from module-slot
to module-slot. You can access these buses via rear-panel screw terminals, labeled, "MUTE 1","MUTE 2" and "GND". Mute-type modules connect to both mute buses
"out-of-the-box". You can disconnect the module's mute function circuitry from each mute bus by cutting jumper wires on the modules. This allows you to configure
systems with multiple levels of priority.

MUTE-RECEIVE modules respond to mute bus activation in either of two ways:1) Switch Activation: Connecting a switch closure between the "MUTE" (1 or 2)" and
"GND" screw terminals on the rear of the mixer/amplifier activates the mute function circuitry of MUTE-RECEIVE modules connected to the same bus. This is also
referred to as "manual muting". 2) Auto-Mute: When input signal level to a MUTE-SEND module exceeds a user-adjustable threshold,the module's mute function cir­cuitry activates the mute function circuitry of all MUTE-RECEIVE modules connected to the same bus. This is also referred to as "signal-activated muting".

M

UTINGMODULES

900 S

ERIESMODULE

C

HART

Literature Order #: L-A900SERIES

Specifications subject to change without notice.

© 2003, TOA Electronics, Inc.

Microphone

Input Modules

Line Input Modules*

Special

Function Modules

Female

Male

1/4”

RCA

XLR

Phone

XLR

Jack

Jack

Dual RCA

Jacks

3 Screw

Terminals

5 Screw

Terminals

Removable

Terminal

Block

Standard with high/low cut filters M-01F M-01M M-01P M-01S
Mute-Receive with high/low cut filters M-11S
Mute-Send with high/low cut filters M-41S

Voice Gate with low cut filters M-51F M-51S

Compressor with high/low cut filters M-61F M-61S
Remote Volume Control with high/low filters M-21S
For high-Z mic. only w/ high/low cut filters M-03P

L-01F L-01S

Standard, no special features B-01F U-O1P U-01R B-01S

U-01F U-01S

Standard with high/low cut filters U-03R U-03S

L-11S

Mute-Receive U-11R B-11S

U-11S
Mute-Receive with high/low cut filters U-13R U-13S
Mute-Receive with variable mute depth U-12S
Mute-Send L-41S B-41S
Mute-Send with high/low cut filters U-43R U-43S

Remote Volume Control

B-21S

U-21S
Compressor U-61S
Line output T-01S
Line input with Music-On-Hold (MOH) output T-02S
Line input w/ MOH & input Mute-Receive T-12S
1 kHz Sine Wave test tone S-01S
Buzzer/Yelp signal tone S-02S
Switch-selectable tone S-04S
Equalizer for F-121C/CM Speakers E-03R
Equalizer for H-1 Speakers E-04R
Equalizer for H-2/H-2WP Speakers E-05R
Equalizer for H-3/H-3WP Speakers

Low Pass Filter for FB-100/HB-1 Speakers

E-06R

E-07S

*For Line Input Modules: Use "B" modules w/ transformer isolation for balanced/unbalanced sources. Use "L" modules
only for 600 ohm impedance matching. Use "U" for unbalanced sources w/ short cables (≤ 15 feet).