Toa A-903MK2 User manual

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 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 ΩTransformer, Female XLR
B-01S LINE Balanced Line Input Module, 10k ΩTransformer, Screw Terminals
B-11S LINE Balanced Line Input Module, 10k ΩTransformer, Mute-Receive, Screw Terminals
B-21S LINE Balanced Line Input Module, 10k ΩTransformer, Remote Volume Control, Screw Terminals
B-41S LINE Balanced Line Input Module, 10k ΩTransformer, Mute-Send, Removable Terminal Block
L-01F LINE Line Matching Input Module, 600 ΩTransformer, Balanced, Female XLR
L-01S LINE Same as L-01F with Screw Terminals
L-11S LINE Line Matching Input Module, 600 ΩTransformer, Balanced, Mute-Receive, Screw Terminals
L-41S LINE Line Matching Input Module, 600 ΩTransformer, 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, ScrewTerminals
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 ΩInput, 600 ΩBalanced Output, Screw Terminals
T-12S SPECIAL FUNCTION Same as T-02S with Input Mute-Receive

TOA E LECTRONICS
, I NC .
601 G
ATEWAY B LVD ., S UITE 300
S OUTH S AN F RANCISCO , CA 94080
TEL: [phone]
FAX: [phone]
www.toaelectronics.com
900 S ERIES
M IXER /
A
MPLIFIERS
LineInputModules* Microphone
InputModules
Female
XLR Male XLR 1/4”
Phone
Jack
RCA
Jack DualRCA
Jacks 3Screw Terminals 5Screw Terminals Removable Terminal
Block
Special
FunctionModules
Standardwithhigh/lowcutfilters M-01F M-01M M-01P M-01S
Mute-Receivewithhigh/lowcutfilters M-11S
Mute-Sendwithhigh/lowcutfilters M-41S
VoiceGatewithlowcutfilters M-51F M-51S
Compressorwithhigh/lowcutfilters M-61F M-61S
RemoteVolumeControlwithhigh/lowfilters M-21S
Forhigh-Zmic.onlyw/high/lowcutfilters M-03P
L-01F L-01S
Standard,nospecialfeatures B-01F U-O1P U-01R B-01S
U-01F U-01S
Standardwithhigh/lowcutfilters U-03R U-03S
L-11S
Mute-Receive U-11R B-11S
U-11S
Mute-Receivewithhigh/lowcutfilters U-13R U-13S
Mute-Receivewithvariablemutedepth U-12S
Mute-Send L-41S B-41S
Mute-Sendwithhigh/lowcutfilters U-43R U-43S
RemoteVolumeControl B-21S
U-21S
Compressor U-61S
Lineoutput T-01S
LineinputwithMusic-On-Hold(MOH)output T-02S
Lineinputw/MOH&inputMute-Receive T-12S
1kHzSineWavetesttone S-01S
Buzzer/Yelpsignaltone S-02S
Switch-selectabletone S-04S
EqualizerforF-121C/CMSpeakers E-03R
EqualizerforH-1Speakers E-04R
EqualizerforH-2/H-2WPSpeakers E-05R
*ForLine InputModules:Use"B" modulesw/transformerisolationforbalanced/unbalancedsources. Use"L"modules
onlyfor600ohmimpedance matching.Use"U" forunbalancedsourcesw/short cables(≤15feet).
EqualizerforH-3/H-3WPSpeakers E-06R
LowPassFilterforFB-100/HB-1Speakers E-07S
Thetwotypesofmutingmodules,MUTE-RECEIVEandMUTE-SEND,havemutefunctioncircuitrythatconnectsto twocommon"MUTE"buses,andonecommon
"GROUND" buswheninstalledinanA-900MK2mixer/amplifierorM-900MK2mixer/pre-amplifier. A "BUS"issimplyaninternalwirethatconnectsfrommodule-slot
tomodule-slot. Youcanaccessthesebusesviarear-panelscrewterminals,labeled, "MUTE1","MUTE2"and"GND". Mute-typemodulesconnecttobothmutebuses
"out-of-the-box". Youcandisconnectthemodule'smutefunctioncircuitryfromeachmutebusbycuttingjumperwiresonthemodules. Thisallowsyoutoconfigure
systemswithmultiplelevelsofpriority.
MUTE-RECEIVEmodulesrespondtomutebusactivationineitheroftwoways:1)SwitchActivation: Connectingaswitchclosurebetweenthe"MUTE"(1or2)"and
"GND"screwterminalsontherearofthemixer/amplifieractivatesthemutefunctioncircuitryof MUTE-RECEIVEmodulesconnectedtothesamebus. Thisisalso
referredtoas"manualmuting". 2)Auto-Mute: WheninputsignalleveltoaMUTE-SENDmoduleexceedsauser-adjustablethreshold,themodule'smutefunctioncir-
cuitryactivatesthemutefunctioncircuitryofall MUTE-RECEIVEmodulesconnectedtothesamebus. Thisisalsoreferredtoas"signal-activatedmuting".
M
UTING M ODULES
900 S ERIES M ODULE C
HART
Literature Order #: L-A900SERIES
Specifications subject to change without notice.
© 2003, TOA Electronics, Inc.