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OPERATING INSTRUCTIONS
700 SERIES AMPLIFIERS
A-706, A-712, A-724
TABLE OF CONTENTS
1. IMPORTANT SAFETY INSTRUCTIONS ........................................................................................ 2
2. SAFETY PRECAUTIONS ............................................................................................................... 2
3. GENERAL DESCRIPTION ............................................................................................................. 4
4. FEATURES ..........
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1. IMPORTANT SAFETY INSTRUCTIONS • Read these instructions. • Keep these instructions. • Heed all warnings. • Follow all instructions. • Do not use this apparatus near water. • Clean only with dry cloth. • Do not block any ventilation openings. Install in accordance with the manufacture's instructions. • Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat. • Do not defeat the safety purpose of the polarized
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surface. Doing so may result in the unit falling cord itself. Operating the unit with a damaged down, causing personal injury and/or property power supply cord may cause a fire or electric damage. shock. When the Unit is in Use • When moving the unit, be sure to remove its power supply cord from the wall outlet. Moving the unit • Should the following irregularity be found during with the power cord connected to the outlet may use, immediately switch off the power, disconnect cause damage to the
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3. GENERAL DESCRIPTION Equipped with 6 LINE/MIC selectable inputs, 2 LINE inputs and 1 MODULE input, the A-706, A-712, and A- 724 PA amplifiers are designed to suit PA system applications such as announcements, BGM and broadcasting in churches, large rooms and factories. 4. FEATURES • Power output of 60 W (A-706), 120 W (A-712), and 240 W (A-724). • Mute Receive function assignable to all inputs, and Mute Send function assignable to Inputs 1 – 3 and Mute input. • An equalizer or other signal p
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[Rear] 9 10 11 12 13 14 15 16 17 19 20 21 22 18 This figure represents the A-724. 9. AC inlet Note Connect the supplied power cord. Avoid assigning both functions to the same input. (1) Mute Receive assignment switches 10. Remote control connector [MUTE RECEIVE (INPUT CH)] Removable terminal block. Allow all inputs (INPUT 1 – 8 and Module) to be assigned to Mute Receive function. (1) Remote volume control terminals [REMOTE VOLUME] (2) Mute Send assignment switches Connecting a 10 kΩ linear tap
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17. Module input slot 21. Power amplifier input jack [PWR AMP IN] Accepts TOA's 900 series module. 0 dB, 600 Ω , unbalanced RCA jack. Accepts output signals from the signal processor 18. Functional ground terminal connected to the Preamplifier output jack (12). (Refer to p. 7.) Hum noise may be generated when external Inserting an RCA plug disconnects the internal equipment is connected to the unit. Connecting power amplifier section from the preamplifier this terminal to the functional ground t
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6.3. Remote Power ON/OFF Control Connection To perform this control, be sure to turn the power switch OFF. Shorting the power remote control terminals turns the power on, and opening them turns the power off. With the power switch ON, the power on/off cannot be remotely MUTE CONTROL controlled. REMOTE POWER VOLUME REMOTE 6.4. Mute Control Connection MUTE CONTROL Shorting the mute control terminals mutes the Mute Receive inputs (the inputs set to be muted). Note The mute control works regardless
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8. RACK MOUNTING To mount the unit in a standard 19" equipment rack, use the optional MB-25B Rack Mounting Bracket. Attach the MB-25B to the unit using the supplied 4 screws. When using other screws, each screw must be shorter than 16 mm. M4 x 16 Machine screw included in MB-25B MB-25B 9. CONTROL SETTINGS Output levels are adjustable with individual volume controls. For music play or announcements, adjust the corresponding volume control so that the red indicator doesn't light. Note that the
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11. BLOCK DIAGRAM Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω Ω 9 Phantom power LINE MIC REC OUT 0 dB/600 INPUT MASTER IT MIC TRIM volume volume INPUT 1 LINE: –10 dB/600 SA Mute MIC: –70 to – 50 dB/600 LINE MIC MUTE VCA RECEIVE Transformer INPUT (optional) MIC TRIM volume TREBLE INPUT 2, 3 Mute Tone LINE: –10 dB/600 control MIC: –70 to – 50 dB/600 BASS PRE AMP OUT, 0 dB/600 LINE MIC PWR AMP IN, 0 dB/10 k INPUT MIC TRIM volume SP OUT Power INPUT 4 – 6 OT Amplifier LINE: –10 dB/600 Mute 70 V MIC: –70 to – 50 dB/
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12. SPECIFICATIONS [A-706] Power Source 120 V AC, 60 Hz Rated Output 60 W Power/Current Consumption 155 W (rated output), 68 W (based on UL60065), under 250 mA (when power switch is OFF) Frequency Response 50 – 20,000 Hz (±3 dB) Distortion Under 2% at 1 kHz, rated power Input INPUT 1 – 6: –70 to –50 dB*, 600 Ω (MIC)/–10 dB*, 600 Ω (LINE) INPUT 1: Transformer-balanced, removable terminal block (3 pins) INPUT 2 – 6: Electronically-balanced, removable terminal block (3 pins) Note: Each of INPUT 2
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[A-712] Power Source 120 V AC, 60 Hz Rated Output 120 W Power/Current Consumption 285 W (rated output), 110 W (based on UL60065), under 400 mA (when power switch is OFF) Frequency Response 50 – 20,000 Hz (±3 dB) Distortion Under 2% at 1 kHz, rated power Input INPUT 1 – 6: –70 to –50 dB*, 600 Ω (MIC)/–10 dB*, 600 Ω (LINE) INPUT 1: Transformer-balanced, removable terminal block (3 pins) INPUT 2 – 6: Electronically-balanced, removable terminal block (3 pins) Note: Each of INPUT 2 and 3 can be conv
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[A-724] Power Source 120 V AC, 60 Hz Rated Output 240 W Power/Current Consumption 565 W (rated output), 215 W (based on UL60065), under 60 mA (when power switch is OFF) Frequency Response 50 – 20,000 Hz (±3 dB) Distortion Under 2% at 1 kHz, rated power Input INPUT 1 – 6: –70 to –50 dB*, 600 Ω (MIC)/–10 dB*, 600 Ω (LINE) INPUT 1: Transformer-balanced, removable terminal block (3 pins) INPUT 2 – 6: Electronically-balanced, removable terminal block (3 pins) Note: Each of INPUT 2 and 3 can be conve
