Toa AV-20D Operating Instructions Manual
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Toa AV-20D Operating Instructions Manual

Toa AV-20D Operating Instructions Manual

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POWER AMPLIFIER

TABLE OFCONTENTS
Front
Rear
Thank you for purchasing TOA's Power Amplifier.
Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.

OPERATING INSTRUCTIONS

P2
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P5
P5
P5
P5
P6
P8
13. APPENDIX
P8
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P9
P9
AV-20D
P10
P10
P10
P10
P10
P11
P12
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P14

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Summary of Contents for Toa AV-20D

  • Page 1: Table Of Contents

    6.1. Removable Terminal Plug Connection P8 13. APPENDIX 6.2. Input Connections 6.3. Speaker Connections 6.4. Remote Volume Connection 6.5. AC Power Connections Thank you for purchasing TOA's Power Amplifier. Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.

  • Page 2: Important Safety Instructions

    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. • Install in accordance with the manufacturer's instructions. •...

  • Page 3: Safety Precautions

    • Should the following irregularity be found during use, immediately switch off the power, disconnect the power supply plug from the AC outlet and contact your nearest TOA dealer. Make no further attempt to operate the unit in this condition as this may cause fire or electric shock.
  • Page 4 CAUTION Indicates a potentially hazardous situation which, if mishandled, could result in moderate or minor personal injury, and/or property damage. When Installing the Unit • Never plug in nor remove the power supply plug with wet hands, as doing so may cause electric shock. •...

  • Page 5: General Description

    3. GENERAL DESCRIPTION The AV-20D is a 2 channel digital amplifier for speech and general announcement. This compact amplifier is equipped switching power supply circuit inside, Energy Star 2.0 certified and PLENUM rated (UL 2043 listed) for the installation into air handling space without external AC adaptor. The rated output power is 15W at 8 Ohms x 2 channel, 20W at 4 Ohms x 2 channel or 40W at 8 Ohms in BTL connection.
  • Page 6 The center position of the control provides flat counterclockwise to decrease it. The center frequency response. [Rear] This figure represents the AV-20D 8. Breaker 10. Speaker output terminal Cuts off the AC power supply from the AC outlet if Connects to speakers. Removable terminal block, the power current exceeds the allowable value.
  • Page 7 12. Input level select switches Use these switches to adjust input gain of Line1, Line 2 and Line 3, respectively. (*0dB=1V) 13. Line 2 input terminal 10K Ohms, unbalanced, 3.5mm mini Phone Jack. Connect a sound source equipment such as a CD player. 14.

  • Page 8: Connections

    6. CONNECTIONS 6.1. Removable Terminal Plug Connection Notes • Avoid soldering cable conductor, as contact resistance may increase when the cable is tightened and the solder is crushed, possibly resulting in an excessive rise in joint temperatures. • Use cables of AWG 12 – 24. [Cable end treatment] 2-core shielded cable Solid cable and stranded cable...

  • Page 9: Speaker Connections

    6.3. Speaker Connections There are two speaker output connections. Use only one for connection. Class 2 wiring may be used. 6.4. Remote Volume Connection When a remove volume control is needed, wiring a 10K Ohms potentiometer to the 2-pin Remote Volume Control Jack as shown below.

  • Page 10: Operation

    7. OPERATION After completing all audio and control connections, connect the power supply, and check the power indicator. Note When the heat sink temperature exceeds 130°C (266 °F), the protection circuit begins to operate to disconnect the output from the circuit. The disconnected output is automatically restored as soon as the temperature returns to the normal operating range.

  • Page 11: Block Diagram

    10. BLOCK DIAGRAM...

  • Page 12: Dimentional Diagram P12

    11. DIMENSIONAL DIAGRAM...

  • Page 13: Specifications

    12. SPECIFICATIONS Model No. AV-20D Power Source 100V-240V AC , 50Hz/60Hz Rated Output 15W x 2 @ 8 Ohms,20W x 2 @ 4 Ohms,40W x 1 @ 8 Ohms (Bridge) Rated Output Power Consumption Idle Less than 6W Power Save Mode...

  • Page 14: Cautions And Warnings

    15. Ensure that the conduit nut from step 10 (Fig.4) firmly secures the conduit EMT adapter plate. 16. Use the 10 screws you removed in step 3 to secure the top cover of the AV-20D back onto its main chassis.

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