TOA A-903MK2 - Manuals - manualsarea.com

Page 2 - Contents

Contents General description Features Nomenclature Front panel Rear panel Input connections Output connections (A-903MK2) Output connections (A-906MK2/A-912MK2) Muting and remote volume control connection Rack mounting Operation Volume adjustment Tone control adjustment Installation Servicing Specif...

Page 3 - General Description; Features; Excellent output regulation

General Description The TOA A-903MK2, A-906MK2 and A-912MK2 Mixer Power Amplifiers control and mix up to eight independent input signals. The A-903MK2 delivers up to 30 watts of output power, the A-906MK2 60 watts and A-912MK2 120 watts. Optional plug-in modules are available for use with these mixe...

Page 4 - Nomenclature; Front Panel; Power Indicator LED; level is fed to the inputs by means of the input; Peak Indicator LED; Tone Switch

Nomenclature Front Panel Power Switch Applies line power. Two-position push button switch for on/off modes. Power Indicator LED Green LED lights when the power is switched "ON". Signal Indicator LED Green LED lights when more than –30 dB signal level is fed to the inputs by means of the inpu...

Page 5 - Rear Panel; AC Power Cord; Output terminals; AUX Out; Power Amp In; Preamp Out; Mute terminals

Rear Panel AC Power Cord Connects to power source. AC Outlet (Unswitched) Provides AC power for auxiliary equipment with power consumption of up to 500W. Output terminals Connect to speakers. Impedance Select Switch Selects the desired impedance. Enables unbalanced output of low impedance when this ...

Page 6 - Input Connections; Select the desired modules for each application. Plug the modules; CAUTION; : Modules should not be inserted or removed while; To connect speakers to outputs of : 4 ohms, 25V or 70V (BALANCED OUTPUT); Note

Input Connections There are eight INPUT PORTS for PLUG-IN MODULES. Select the desired modules for each application. Plug the modules into the INPUT PORTS. Slide them between the guide rails and secure with two screws. CAUTION : Modules should not be inserted or removed while the amplifier is turned ...

Page 7 - To connect speakers to 8-ohm output (UNBALANCED DIRECT OUTPUT); Output Connection; To connect speakers to outputs of : 8 ohms, 25V or 70V (BALANCED OUTPUT)

To connect speakers to 8-ohm output (UNBALANCED DIRECT OUTPUT) (A-903MK2) 8-ohm Loosen the screw. Place the impedance switch in 8-ohm position. Tighten the screw. Output Connection (A-906MK2/A-912MK2) The speaker outputs of the amplifier are 4 ohms, 8 ohms, 25V and 70V. Connect speakers to any one o...

Page 8 - To connect speakers to 4-ohm output (UNBALANCED DIRECT OUTPUT); Muting and Remote Volume Control Connection; Rack Mounting; Remove 4 screws securing case.

To connect speakers to 4-ohm output (UNBALANCED DIRECT OUTPUT) (A-906MK2/A-912MK2) 4-ohm Loosen the screw. Place the impedance switch in 4-ohm position. After all connections are made, tighten the s c r e w . Muting and Remote Volume Control Connection MUTE 2 MUTE 1 POTENTIOMETER 10k OHMS Remote vol...

Page 9 - controls are unnecessary, set the tone switch to ON mode.; Installation; with high humidity or dust levels.; Servicing; Unpacking

Operation After all connections are made, turn power switch ON, illuminating the Power Indicator LED. The amplifier comes into operation approximately 5 seconds after the power is turned on. Volume Adjustment Obtain desired output level by adjusting the individual input and master volume controls. F...

Page 10 - Specifications

Specifications Type Output Power Power Band Width Frequency Response Total Hamonic Distortion Inputs Input Sensitivity/Impedance Preamp OUT/Power Amp IN Outputs (T)=Transformer (D)=Direct Output Regulation (1 kHz) Signal to Noise Ratio (Band Pass 20 ~20,000 Hz) Tone Defeat SW ON Tone Controls Contro...

Page 12 - TOA Corporation

Appearance (A-906MK2/A-912MK2) Front View 420 Rear View Top View Side View 88.4 99.1 320 358 17 TOA Corporation KOBE, JAPAN PRINTED IN TAIWAN 133-12-114-60