Toa DA-250DH CU Operating Instructions Manual
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Toa DA-250DH CU Operating Instructions Manual

Toa DA-250DH CU Operating Instructions Manual

Dual power amplifiers
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DUAL POWER AMPLIFIERS
Thank you for purchasing TOA's Dual Power Amplifier.
Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.

OPERATING INSTRUCTIONS

DA-250D CU
DA-250DH CU
Note: The figure shows the DA-250D.

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Summary of Contents for Toa DA-250DH CU

  • Page 1: Operating Instructions

    DUAL POWER AMPLIFIERS Thank you for purchasing TOA's Dual Power Amplifier. Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment. OPERATING INSTRUCTIONS DA-250D CU DA-250DH CU Note: The figure shows the DA-250D.

  • Page 2: Table Of Contents

    13. CLEANING THE FILTER 14. BLOCK DIAGRAMS 14.1. DA-250D ... 16 14.2. DA-250DH ... 16 15. DIMENSIONAL DIAGRAM 16. SPECIFICATIONS 16.1. DA-250D CU ... 18 16.2. DA-250DH CU ... 19 ... 4 ... 6 ... 6 ... 6 ... 7 ... 10 ...

  • Page 3: 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. • Do not block any ventilation openings. Install in accordance with the manufacturer's instructions. •...

  • Page 4: Safety Precautions

    2. SAFETY PRECAUTIONS • Before installation or use, be sure to carefully read all the instructions in this section for correct and safe operation. • Be sure to follow all the precautionary instructions in this section, which contain important warnings and/or cautions regarding safety.
  • Page 5 • When moving the unit, be sure to remove its power supply cord from the wall outlet. Moving the unit with the power cord connected to the outlet may cause damage to the power cord, resulting in fire or electric shock. When removing the power cord, be sure to hold its plug to pull.

  • Page 6: General Description

    3. GENERAL DESCRIPTION TOA's DA-250D and DA-250DH Dual Power Amplifiers feature high power handling capabilities and durability. The DA-250D is configured with 250 W x 2 channels (4 Ω output) and 170 W x 2 channels (8 Ω output), and the DA-250DH features a 250 W x 2 channels (19.6 Ω...

  • Page 7: Installation Precautions

    6. INSTALLATION PRECAUTIONS CAUTION • The supplied power supply cord is designed for exclusive use with this unit. Never use it with other equipment. • When mounting the unit in an equipment rack, the inside of the rack must be sufficiently ventilated. To achieve sufficient ventilation, remove all panels on the rear of the rack.

  • Page 8: Nomenclature And Functions Front

    7. NOMENCLATURE AND FUNCTIONS [Front] 1. Power switch [ ON / Power is switched on and off with each depression of this switch. 2. Power indicator [POWER] Lights blue when the power is switched on. 3. Input level controls [CH 1/BRIDGE, CH 2] Adjust the input level of each channel.

  • Page 9: Rear

    [Rear] DA-250D DA-250DH 6. AC inlet Connect the supplied power cord to this inlet. 7. Functional ground terminal [SIGNAL GND] Hum noise may be generated when external equipment is connected to the unit. Connecting this terminal to the functional ground terminal of the external equipment may reduce the hum noise.

  • Page 10: Settings And Connections

    8. SETTINGS AND CONNECTIONS [Rear panel] Speaker output terminals (with a terminal cover) Step 1. Switch off the unit's power. Step 2. Set the BRIDGE ON/OFF switch and CH 1 mode ON/OFF switch. Step 3. Connect the sound source equipment to the Input terminals. Note: Refer to p.

  • Page 11: Switch Settings And Speaker Connections

    8.1. Switch Settings and Speaker Connections [2 inputs - 2 outputs] (factory-preset) [1 input - 2 outputs] [1 input - 1 output] Speaker output terminals Switch Setting BRIDGE CH 1 mode Speaker output terminals Switch Setting BRIDGE CH 1 mode Speaker output terminals Switch Setting...

  • Page 12: Removable Terminal Plug Connection

    9. REMOVABLE TERMINAL PLUG CONNECTION Cautions • Be sure to use shielded cables for audio signal lines. • 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. •...

  • Page 13: Input Sensitivity And High-Pass Filter On/Off Settings

    10. INPUT SENSITIVITY AND HIGH-PASS FILTER ON/OFF SETTINGS The Input sensitivity can be set to +4 dB (factory-preset) or -10 dB for each channel. Besides, only the DA-250DH employs the High-pass filter on each channel, which can be set to "ON" or "OFF." CAUTION These servicing instructions are for use by qualified personnel only.

  • Page 14: Protection Operation List

    11. PROTECTION OPERATION LIST Failure Protection Overcurrent due Current limiter activated to overload when impedance drops below the specified value. Short circuit Current limiter activated. Load is disconnected. Rise in heat sink Load disconnected. temperature (over 100°C) Temperature rise Built-in amplifier unit inside the unit that caused the failure (over 80°C)

  • Page 15: Cleaning The Filter

    13. CLEANING THE FILTER Step 1. Switch off the unit's power. Step 2. Remove the ventilation panel as shown in the figure. Step 3. Detach the filter inside the ventilation panel. Step 4. Clear the filter of dust. Step 5. Replace the filter and ventilation panel. Ventilation Panel Detach the panel by pressing on the left or right side.

  • Page 16: Block Diagrams

    14. BLOCK DIAGRAMS 14.1. DA-250D CH 1 INPUT CH 1 input level control CH 2 INPUT PARALLEL switch CH 2 input level control 14.2. DA-250DH CH 1 INPUT CH 1 input level control CH 2 INPUT PARALLEL switch CH 2 input level control +4 dB...

  • Page 17: Dimensional Diagram

    15. DIMENSIONAL DIAGRAM Unit: mm (inches) 442 (17.4) 465 (18.31) 482 (18.98)

  • Page 18: Specifications

    16. SPECIFICATIONS 16.1. DA-250D CU Power Source Amplification system Power Consumption Input Rated Output Frequency Response Total Harmonic Distortion Protection Circuit S/N Ratio Crosstalk LED Indicator Cooling Operating Temperature Operating Humidity Finish Dimensions Weight * 0 dB = 0.775 V Note: The design and specifications are subject to change without notice for improvement.

  • Page 19: Da-250Dh Cu

    16.2. DA-250DH CU Power Source 120 V AC, 50/60 Hz Amplification system Digital class D Power Consumption 120 W (based on UL/CSA standards) 580 W (rated output 19.6 Ω x 2) Input 2 circuits, +4 dB* (1.23 V, input level control in maximum position), 10 kΩ, electronically-balanced, removable terminal block (3 pins)
  • Page 20 URL: http://www.toa.jp/ 133-22-125-50...

This manual is also suitable for:

Da-250dDa-250d cu

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