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The A-1800 series are more sophisticated than TOA’s A-1000 and A-1700 series, offering more inter-connectivity options, such as inputs for paging, telephone and emergency signals, combined with features such as balanced inputs, remote control and AC/DC powering. Speaker outputs are to two zones, and offer 100V line or low impedance connection.

The front panel has level controls for three microphone inputs and three auxiliary inputs. There are bass and treble adjustments, master volume, LED level display and power switch with LED. Two switches select which zones are in use. LEDs show the status of the Emergency and Telephone functions. The rear has IEC power inlet; loudspeaker outputs using M4 screws; connectors for inputs and outputs. Two M4 terminals are for the connection of 24V DC power source. Microphones 1- 3, Aux 3 (mono) are connected using connectors combining XLR3 and 3-pole jack sockets. Aux 1 and Aux 2 inputs feature dual RCA (phono) connectors , mixing dual channel sources to mono. The record output also has dual RCA connectors to feed both channels of a stereo recording device. Two RCA connectors provide line out; by default they are both fed with the same signal as the power amplifier, but may be configured individually, internally, to follow the zone selection switches, such that line out 1/2 operates when Zone1/2 is active. A miniature (DIP) switch bank provides phantom power for microphone inputs 1 to 3 and sets operation of muting and chimes. A further terminal block provides connections for the emergency and telephone inputs, ‘Music on hold’ output, and control signals. Four rotary controls set levels for the music on hold output (fed by the signal on the Aux 1 input), emergency and telephone paging signals, chimes.

Microphone input 1 is equipped with a switch to divert the input connection to a 5-pin DIN connector. This allows the connection of a PM-660D paging microphone, which is fitted with a press to talk switch. Chimes can be set from none to four tones, for use with the paging mic facility and/or telephone announcements. Priority configuration is comprehensive, and the returning programme signal fades back smoothly. For more information concerning configuration, please contact Technical Support for a copy of the manual (.pdf).

Technical Specification:
Mic inputs: -60dBV, balanced, for low impedance mic, XLR3 / three-pole 6.35mm jack
Mic 1 input 2: Alternative 5-pin DIN, with PTT contacts
Aux1, 2 inputs (1): -20dBV, unbalanced, dual RCA (phono)
Aux3 input: -20dBV, unbalanced, XLR3 / three-pole 6.35mm jack
‘Telephone’ input: 0dBV, unbalanced, 10k ohms, screw terminals
Emergency input: 0dBV, unbalanced, screw terminals
Frequency response: 50-20,000Hz, +/- 3dB
Distortion: Less than 2 percent at 1kHz, rated power
Signal to noise: Better than 100dB, master volume shut. Better than 76dB; master volume fully open; all input volumes shut. Better than 60dB; Mic 1-4. Better than 76dB; Aux 1-5
Tone controls: Bass; +/-10dB, 100Hz. Treble; +/-10dB, 10kHz
Recording output: 0dBV, unbalanced. Dual RCA (phono) connectors
Line outputs: 0dBV, unbalanced. Two RCA (phono) connector
Music on hold: 0dBV, transformer balanced, screw terminals
Control inputs: Telephone: Closing contact to activate, 24V DC, 5mA. Emergency: Closing contact to activate, 24V DC, 10mA
Control outputs: Power remote; Open collector, withstand 35V, below 50mA
Speaker outputs: Zone 1;100V line. Zone 2; 100V line. Direct; 100V line, 4ohm, balanced
Model: A1803 A1806 A1812
Power output(2) : 30W 60W 120W
Power consumption(3) : 80W / 2A 158W / 3.8A 260W / 7A
Weight: 8.1kg 9.4kg 12.6kg
Power source: AC: 220-230V AC, 50/60Hz. DC: 24V
Environment: -10 to +40 degrees C
Dimensions: 420(w) x 107.7(h) x 367(d) mm

Notes: (1) When using both inputs; (2) rated; (3) AC/DC, at rated power

Included accessories: AC cordset with UK 13A plug, terminal block cover
Optional accessories: Rack mounting ears (pair) MB-25; volume control cover set YA-920 is a pack of eleven covers which will clip into the aperture on the front panel after removing a level or tone control control knob.

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TOA A-1803 MIXER AMPLIFIER 30W/4, 100V. AC/DC power, 2 zone, rackmountable with MB-25B   Stock code: 93-051
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TOA A-1806 MIXER AMPLIFIER 60W/4, 100V. AC/DC power, 2 zone, rackmountable with MB-25B   Stock code: 93-052
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TOA A-1812 MIXER AMPLIFIER 120W/4, 100V. AC/DC power, 2 zone, rackmountable with MB-25B   Stock code: 93-053
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TOA MB-25B RACKMOUNT BRACKET 2U, for 1000, 1700, 1800 series mixer amplifier, P-1812, pair   Stock code: 93-044
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TOA YA-920 CONTROL COVER For 1700, 1800 series mixer amplifier, set of 11   Stock code: 93-048
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