Toa A-903A, Operating Instructions Manual, Page: 7 / 15

Type
Output Power
Power Band Width
Frequency Response
Total Harmonic Distortion
Inputs
Input Sensitivity/Impedance
Preamp OUT/Power Amp IN
Outputs
(D) = Direct
(T) = Transformer
Output Regulation (1 kHz)
Signal to Noise Ratio
(Band Pass 20 — 20,000 Hz)
Tone Controls Centered
Tone Controls
A-903A
30 watts RMS
(D)
(T)
A-906A
6-channel mixer power amplifier
60 watts RMS
A-912A
120 watts RMS
20 — 20,000 Hz, 0.5% THD
50 — 20,000 Hz, 0.5% THD
(D) 20 — 20,000 Hz, ±1 dB
(T) 20 — 15,000 Hz, ±1 dB
(T) 20 — 20,000 Hz, ±1dB
— 3 dB
0.02% at 1 kHz, rated output
Six Input Ports: Each port accepts any input module except T-01. Use T-01 only in port #5 or #6.
One Bridging Input/Output
Input Ports #1 to #6 : 100 mV/10k ohms
Bridging Input/Output: 100 mV/3.3k ohms
1,000 mV into 600 ohms/1,000 mV, 10k ohms
Main (T): 4 ohms, 25 & 70 volts
balanced
Main (D): 8 ohms, unbalanced
Aux :
10k ohms, 1,000 mV
Main (T) : 8 ohms, 25 & 70 volts, balanced
Main (D): 4 ohms, unbalanced
Aux : 10k ohms, 1,000 mV
(D) Less than 0.5 dB, no load to full load (T) Less than 1.0 dB, no load to full load
Master volume min. : 90 dB
Master volume max. : 77 dB
Power amplifier only: 105 dB
Bass; ±10 dB at 100 Hz: Treble; ±10 dB at 10 kHz
Controls
6 Input gain controls
1 Bass tone control
1 Power ON/OFF switch
1 Tone defeat switch
1 Master gain control
1 Treble tone control
1 Link switch
1 Low-cut switch (60 Hz, 6 dB/octave)
Indicator
1 Illuminated VU meter
Self-protection, with 2 AC fuses (1 inside) and 1 output fuse.
Protection
Power Consumption
Temperature Range
Dimensions in mm (inches)
(high) x (wide) x (deep)
Weight (without input modules)
Color
Standard Accessories
Other Features
AC 120 volts, 60 Hz, 60 watts AC 1 20 volts, 60 Hz, 100 watts AC 120 volts, 60 Hz, 180 watts
-10°C to +60°C (12°F to 140°F)
101 (3.98") x 420 (16.54")
x 265 (10.43")
Rack-mounting space size "2U"
(3.46")
7 . 3 k g (16.1 Ibs.)
145 (5.71") x 420 (16.54") x 315 (12.40")
Rack-mounting space size "3U" (5.21")
11.4 kg (25.1 Ibs.)
15.2 kg (33.4 Ibs.)
Silver
2 Volume control covers
1 Mute terminal plug
Output disconnected for approx. 5 sec after switching power on.
Muting Function; Accomplished by model E-11, X-11, B-11
Connectors
Card-edge connector
RCA phono jack
Screw-terminal strip
2P Socket
SJT, 3-prong type
3-pin grounding type
Input #1 to #6
Bridging
Mixer preamp. output
Power amp. input
Aux output
Output
Mute
AC power cord/plug
AC outlet
Specifications
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