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MULTICHANNEL POWER AMPLIFIERS
An all-pole mains switch with a contact separation of at least 3 mm (0.12") in each pole
shall be incorporated in the electrical installation of the building.
Thank you for purchasing TOA's Multichannel Power Amplifier.
Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.
OPERATING INSTRUCTIONS
DA-250F CU
DA-250FH CU
Note: The figure shows the DA-250F.
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Summary of Contents for Toa DA-250F CU
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Page 1: Operating Instructions
Thank you for purchasing TOA's Multichannel Power Amplifier. Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment. OPERATING INSTRUCTIONS DA-250F CU DA-250FH CU Note: The figure shows the DA-250F. -
Page 2: Table Of Contents
13. CLEANING THE FILTER 14. BLOCK DIAGRAMS 14.1. DA-250F ... 16 14.2. DA-250FH ... 17 15. DIMENSIONAL DIAGRAM 16. SPECIFICATIONS 16.1. DA-250F CU ... 19 16.2. DA-250FH CU ... 20 ... 4 ... 6 ... 6 ... 6 ... 7 ... -
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.
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Page 6: General Description
3. GENERAL DESCRIPTION TOA's DA-250F and DA-250FH Multichannel Power Amplifiers feature high power handling capabilities and durability. The DA-250F is configured with 250 W x 4 channels (4 Ω output) and 170 W x 4 channels (8 Ω output), and the DA-250FH features a 250 W x 4 channels (70 V line, 19.6 Ω output) configuration. Besides, each model's output is made available for bridge connection, allowing it to be used as a stereo amplifier of 500 W (8 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 / Turning this switch on causes the amplifier to function, and turning it off causes the amplifier to cease function. Note: The unit is not completely disconnected from the power supply even if this Power switch is turned off. -
Page 9: Rear
[Rear] DA-250F DA-250FH 6. AC inlet Connect the supplied power cord to this inlet. The socket-outlet shall be installed near the equipment and the plug (disconnecting device) shall be easily accessible. 7. Functional ground terminal [SIGNAL GND] Hum noise may be generated when external equipment is connected to the unit. -
Page 10: Settings And Connections
8. SETTINGS AND CONNECTIONS [Rear panel] Speaker output terminals (with a terminal cover) Step 1. Turn off this unit's Power switch. Step 2. Set the BRIDGE ON/OFF switches and CH 1 mode ON/OFF switch. Step 3. Connect the sound source equipment to the Input terminals. Note: Refer to p. - Page 11 [1 input - 4 outputs] [2 inputs - 2 outputs] [1 input - 2 outputs] [3 inputs - 3 outputs (1)] [3 inputs - 3 outputs (2)] Speaker output terminals Switch Setting BRIDGE 1 BRIDGE 2 CH 1 mode Speaker output terminals Switch Setting BRIDGE 1...
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Page 12: Removable Terminal Plug Connection
[1 input - 3 outputs (1)] [1 input - 3 outputs (2)] 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-250FH 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 Overcurrent due Current limiter activated to overload when impedance drops below the specified value. Short circuit Current limiter activated. Load is disconnected. Temperature rise Load disconnected. at power amp. heat sink (over 110°C or 230°F) Temperature rise Built-in amplifier unit inside the unit... -
Page 15: Cleaning The Filter
13. CLEANING THE FILTER Step 1. Turn off this unit's Power switch. 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 sides. -
Page 16: Block Diagrams
14. BLOCK DIAGRAMS 14.1. DA-250F... -
Page 17: Da-250Fh
14.2. DA-250FH... -
Page 18: Dimensional Diagram
15. DIMENSIONAL DIAGRAM Unit: mm (inches) 442 (17.4) 465 (18.31) 482 (18.98) -
Page 19: Specifications
16. SPECIFICATIONS 16.1. DA-250F CU Power Source 120 V AC, 50/60 Hz Amplification system Class D Power Consumption 200 W (based on UL/CSA standards) 1300 W (rated output 4 Ω x 4) 850 W (rated output 8 Ω x 4) Input 4 circuits, +4 dB* (1.23 V, input level control in maximum position),... -
Page 20: Da-250Fh Cu
16.2. DA-250FH CU Power Source 120 V AC, 50/60 Hz Amplification system Class D Power Consumption 200 W (based on UL/CSA standards) 1200 W (rated output 70 V line, 19.6 Ω x 4) Input 4 circuits, +4 dB* (1.23 V, input level control in maximum position), 10 kΩ, electronically-balanced, removable terminal block (3 pins) CH 1 mode ON/OFF switch (ON: CH 1 to All ch, OFF: Each ch) Rated Output...
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