Toa A-903MK2 User Manual

900 series
MIXER POWER AMPLIFIERS
A-903MK2
A-906MK2
A-912MK2
9
00
SERIES
AMPL
IFIER
A
–
903
MK
2
T
O
N
E
D
E
F
E
A
T
OFF
ON
L
O
W
C
U
T
OFF ON
S
I
G
N
A
L
N
O
R
M
A
L
PR
O
T
E
CT
O
N
OF
F
P
E
A
K
P
O
W
E
R
M
A
S
T
ER
IN
P
U
T
8
IN
P
U
T
7
IN
P
U
T 6
IN
P
U
T
5
I
N
P
U
T
4
IN
P
U
T
3
IN
P
U
T
2
T
R
E
B
L
E
IN
P
U
T
1
B
A
S
S
OPERATING INSTRUCTIONS
Thank you for purchasing TOA's 900 Series Mixer Power Amplifier.
Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.
This figure represents the A-903MK2.
TABLE OF CONTENTS
1. IMPORTANT SAFETY INSTRUCTIONS ..... 2
2. SAFETY PRECAUTIONS ............................ 3
3. GENERAL DESCRIPTION .......................... 5
4. FEATURES .................................................. 5
5. NOMENCLATURE AND FUNCTIONS ........ 6
6. INSTALLATION AND CONNECTIONS
6.1. Module Installation ................................ 8
6.2. Speaker Connections ............................ 9
6.3. Remote Control Connections .............. 11
7.
RACK MOUNTING BRACKET ATTACHMENT ... 12
8. OPERATION .............................................. 13
9. VOLUME CONTROL COVER ................... 13
10. DIMENSIONAL DIAGRAMS
10.1. A-903MK2 ......................................... 14
10.2. A-906MK2, A-912MK2 ...................... 14
11. SPECIFICATIONS
11.1. A-903MK2 ......................................... 15
11.2. A-906MK2, A-912MK2 ...................... 16

Toa A-903MK2 Specifications

General

Tone Control	Bass: ±10 dB at 100 Hz, Treble: ±10 dB at 10 kHz
Power Source	AC 120 V, 60 Hz
Frequency Response	20Hz - 20kHz (±1dB)
Total Harmonic Distortion	Less than 0.5%, 1 kHz, rated power
Input Sensitivity	Mic: -60 dB, Aux: -20 dB
Signal-to-Noise Ratio	60 dB or more
Input	Mic, Aux
Output	4-16 ohms
Input Impedance	MIC: 600Ω, AUX: 10 kΩ
Output Impedance	4-16 ohms
Phantom Power	Not supported