TOA A-1803 Mixer Power Amplifier

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TOA A-1803 Mixer Power Amplifier

Equipped with Priority function, Chime function, and 2 Zone selector switches, the A-1803 PA Amplifier of 30 W is designed to suit the following PA system applications: paging announcements, intercommunications, BGM, and broadcasting in schools, offices, and shops. It’s power remote control function, provided especially for use in conjunction with the P-1812 (optional), will turn ON or OFF the P-1812’s power.


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Power Source 220 V – 230 V AC, 50/60 Hz
24 V DC (M4 screw terminal)
Rated Output 30 W
Power/Current Consumption AC operation: 80 W (rated output), 37 W (EN60065),
24 V DC operation: 2.0 A (rated output), 1.0 A (EN60065)
Frequency Response 50 Hz – 20 kHz (±3 dB)
Distortion 2 % or less at 1 kHz, rated power
Input MIC 1: -60 dB(*1), 600 Ω, electronically-balanced,
combined type of XLR-3-31 equivalent and phone jack, DIN socket (5 pins)
MIC 2 – 3: -60 dB(*1), 600 Ω, electronically-balanced,
combined type of XLR-3-31 equivalent and phone jack
AUX 1 (MOH): -20 dB(*1), 10 kΩ, unbalanced, RCA pin jack
AUX 2: -20 dB(*1), 10 kΩ, unbalanced, RCA pin jack
AUX 3: -20 dB(*1), 10 kΩ, unbalanced, combined type of XLR-3-31 and phone jack
TEL(*2): -20 dB(*1), 10 kΩ, electronically-balanced, M3 screw terminal
EMERGENCY: 0 dB(*1), 600 Ω, unbalanced, M3 screw terminal
Output REC: 0 dB(*1), 600 Ω, unbalanced, RCA pin jack
LINE 1, 2 (*3): 0 dB(*1), 600 Ω, unbalanced, RCA pin jack
MOH: 0 dB(*1), 600 Ω, transformer balanced, M3 screw terminal
SPEAKER SELECTOR: 2 zone, high impedance (100 V line/330 Ω), individual selector switch,
M4 screw terminal
DIRECT SPEAKER OUT: High impedance (100 V line/330 Ω), M4 screw terminal
Low impedance (4 – 16 Ω), M4 screw terminal
(Both Low and High impedance terminals cannot be used at the same time.)
Phantom Power ON or OFF for each MIC1 – 3 with switch setting (+17 V DC)
S/N Ratio (Band Pass : 20 Hz – 20 kHz) 100 dB or more (Master volume: min)
76 dB or more (Master volume: max)
60 dB or more (MIC 1 – MIC 3)
76 dB or more (AUX 1 – AUX 3)
90 dB or more (TEL)
96 dB or more (EMERGENCY)
Tone Control Bass: ±10 dB at 100 Hz, Treble: ±10 dB at 10 kHz
Control Input TEL: No-voltage make contact input, open voltage: 24 V DC, short-circuit: 5 mA or less,
M3 screw terminal
EMERGENCY(*4): No-voltage make contact input, open voltage: 24 V DC,
short-circuit: 10 mA or less, M3 screw terminal
Control Output Power remote: Open collector output, withstand voltage: 35 V DC,
control current: 50 mA or less, M3 screw terminal
Chime 1-tone, 2-tone, or ascending 4-tone chime, or None selectable with switch setting,
activated at MIC 1’s DIN or CONTROL TEL terminal.
Indicator 5 point LED output level meter, Power indicator LED, Zone indicator LED, Emergency LED,
Priority EMERGENCY: Overrides other inputs
TEL: Overrides other inputs except ‘EMERGENCY’, ON/OFF selectable with switch setting
MIC 1: Overrides other inputs except ‘EMERGENCY & TEL’,
ON/OFF selectable with switch setting
Operating Temperature -10 ℃ to +40 ℃
Finish Panel: ABS resin, black, hairline
Case: Steel plate, black
Dimensions 420 (W) × 107.7 (H) × 367 (D) mm
Weight 8.1 kg
Accessory Power cord ……1, Terminal block cover ……1, Terminal block cover mounting screw ……2
Option Rack mounting bracket: MB-25B
Volume control cover: YA-920
Input transformer: IT-453A

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