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Toa DA-250F CU - page 1
OPERA TING INSTRUCTIONS MUL TICHANNEL POWER AMPLIFIERS DA-250F CU DA-250FH CU 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. Note: The figure shows the DA-250F. ...
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Toa DA-250F CU - page 2
2 T ABLE OF CONTENTS 1. IMPORT ANT SAFETY INSTRUCTIONS .................................................... 3 2. SAFETY PRECAUTIONS ............................................................................... 4 3. GENERAL DESCRIPTION ............................................................................. 6 4. FEA TURES .................... ...
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Toa DA-250F CU - page 3
3 1. IMPORT ANT 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. • Do not install near ...
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Toa DA-250F CU - page 4
4 When Installing the Unit • Do not expose the unit to rain or an environment where it may be splashed by water or other liquids, as doing so may result in fire or electric shock. • Use the unit only with the voltage specified on the unit. Using a voltage higher than that which is specified may result in fire or electric shock. • Do not cut, ...
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Toa DA-250F CU - page 5
5 shock. • 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. • Do not block the ventilation panels on the front. Do ...
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Toa DA-250F CU - page 6
6 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 (19.6 Ω output) configuration. Besides, each model&ap ...
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Toa DA-250F CU - page 7
7 6. INST ALLA TION PRECAUTIONS • 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. • When mounting t ...
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Toa DA-250F CU - page 8
8 7. NOMENCLA TURE AND FUNCTIONS [Front] 1. Power switch [ ON/ OFF] 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 volume controls [CH 1 (BRIDGE 1), CH 2, CH 3 (BRIDGE 2), CH 4] Adjust the input volume of each channel. When a bridge connection is made ...
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Toa DA-250F CU - page 9
9 [Rear] 6 7 8 Note: The figure is common to DA-250F and DA-250FH. 9 9 10 11 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 reduc ...
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Toa DA-250F CU - page 10
10 8. CONNECTIONS 8.1. Procedure Step 1. Switch off the unit's power. Step 2. Set the BRIDGE ON/OFF buttons and CH 1 mode ON/OFF button. Step 3. Connect the sound source equipment to the Input terminals. Note Refer to p. 12 for the removable terminal plug connection. Step 4. Connect speakers to the Speaker output terminals. 4-1. Unscrew the ou ...
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Toa DA-250F CU - page 11
11 [1 input - 2 outputs] CH1 CH1 CH2 CH3 CH4 BRIDGE 1 BRIDGE 2 - + - + – + – + Button BRIDGE 1 BRIDGE 2 CH 1 mode ON ON ON Setting Speaker output terminals 8 – 16 Ω 8 – 16 Ω 39.2 Ω 39.2 Ω DA-250F DA-250FH CH1 - + CH2 - + [3 inputs - 3 outputs (1)] CH1 CH2 CH3 CH1 CH2 CH3 CH4 Speaker output terminals 4 – 8 Ω 4 – 8 Ω 8 – 16 ...
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Toa DA-250F CU - page 12
12 Connector connections Step 1. Loosen the terminal screw, then insert the cable. Step 2. Retighten the terminal screw. (Pull on the cable to ensure it is securely connected.) Tip Recommended slotted screwdriver type: Screwdriver with blade that is 3 mm in width Tightens Loosens Terminal screw Slotted screwdriver Shielded cable Removable terminal ...
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Toa DA-250F CU - page 13
13 10. INPUT SENSITIVITY AND HIGH-P ASS FIL TER 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." These servicing instructions are for use by qualified personnel only. T ...
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Toa DA-250F CU - page 14
14 1 1. PROTECTION OPERA TION LIST Failure Protection Operation Indicator Remedy Recovery Overcurrent due to overload Current limiter activated when impedance drops below the specified value. Peak indicator lights. Remove overload. Connecting a correct load automatically restores normal operation. Short circuit Current limiter activated. Load is di ...
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Toa DA-250F CU - page 15
15 13. CLEANING THE FIL TER 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. Detach the panel by pressing on the left and right sides. Filter V entilation P ...
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Toa DA-250F CU - page 16
16 H C CH 1 INPUT E H C CH 2 INPUT E Current Limitter Short Detector Protection Circuit OUTPUT 1 relay CH 1 OUTPUT CH 2 OUTPUT +4 dB - 10 dB CH 1 sensitivity selection jumper (+4 dB/ - 10 dB) CH 1 volume control +4 dB - 10 dB CH 2 sensitivity selection jumper (+4 dB/ - 10 dB) CH 2 volume control ON OFF BRIDGE 1 ON/OFF switch + - BRIDGE 1 OUTPUT Cur ...
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Toa DA-250F CU - page 17
17 14.2. DA-250FH OFF ON CH 2 HPF ON/OFF jumper HPF 50 Hz OFF ON CH 3 HPF ON/OFF jumper HPF 50 Hz OFF ON CH 4 HPF ON/OFF jumper HPF 50 Hz H C CH 1 INPUT E H C CH 2 INPUT E Current Limitter Short Detector Protection Circuit OUTPUT 1 relay CH 1 OUTPUT CH 2 OUTPUT +4 dB - 10 dB CH 1 sensitivity selection jumper (+4 dB/ - 10 dB) CH 1 volume control +4 ...
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Toa DA-250F CU - page 18
18 15. DIMENSIONAL DIAGRAM Unit: mm 482 465 400 374 20 31.8 44 ...
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Toa DA-250F CU - page 19
19 16. SPECIFICA TIONS * 0 dB = 0.775 Vrms Note: The design and specifications are subject to change without notice for improvement. • Accessories Power cord (2 m) ................................................................. 1 Removable terminal plug (3P) ............................................. 4 Volume control cap .................... ...
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Toa DA-250F CU - page 20
Printed in Japan 133-22-027-00 ...
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