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OPERATING INSTRUCTIONS
MULTICHANNEL POWER AMPLIFIERS
DA-250F CU
DA-250FH CU
Note: The figure shows the DA-250F.
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.
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TABLE OF CONTENTS 1. IMPORTANT SAFETY INSTRUCTIONS .................................................... 3 2. SAFETY PRECAUTIONS ............................................................................... 4 3. GENERAL DESCRIPTION ............................................................................. 6 4. FEATURES .......................................................................................................... 6 5. HANDLING PRECAUTIONS ..........................................
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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 manufacturer'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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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. • After reading, keep this manual handy for future reference. Safety Symbol and Message Conventions Safety symbols and messages described below are used in this manual to prevent bodily injury and property damage
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• When moving the unit, be sure to remove its power • Make sure to set all input level controls to (infinity) ∞ supply cord from the wall outlet. Moving the unit position before power is switched on. with the power cord connected to the outlet may Loud noise produced when power is switched on cause damage to the power cord, resulting in fire or with any of those controls set to the position other electric shock. When removing the power cord, be than position can impair hearing. ∞ sure to hold
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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 for DA-250F, 140 V line 39.2 Ω for DA-250FH)
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6. INSTALLATION PRECAUTIONS Rack mounting screws are not supplied with the unit. Be sure to use the screws with a diameter of over 5 mm (0.2") and CAUTION length of over 12 mm (0.47") to mount the unit. Failure to do so may cause personal injury. • 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,
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7. NOMENCLATURE AND FUNCTIONS [Front] 3 4 5 2 1 Note: The figure shows the DA-250F. 1. Power switch [ ON / OFF] 4. Ventilation panel (Air Vent) A filter is located inside the ventilation panel. Turning this switch on causes the amplifier to To clean the filter, remove the ventilation panel. function, and turning it off causes the amplifier to (See p. 15; Cleaning the Filter.) cease function. Note: The unit is not completely disconnected from the power supply even if this Power 5. Indicators [
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[Rear] 6 7 8 9 10 9 DA-250F 11 6 7 8 9 10 9 DA-250FH 11 6. AC inlet Note Be sure to first turn off the Power switch (1) when Connect the supplied power cord to this inlet. changing these switch settings. The socket-outlet shall be installed near the equipment and the plug (disconnecting device) 10. CH1 mode ON/OFF switch shall be easily accessible. [CH 1 TO ALL, ON / OFF] Setting this switch to ON transmits the Channel 1 7. Functional ground terminal [SIGNAL GND] input signal to all channels.
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8. SETTINGS AND CONNECTIONS CH 1 mode ON/OFF switch BRIDGE 2 ON/OFF switch BRIDGE 1 ON/OFF switch [Rear panel] Speaker output terminals Input terminals (with a terminal cover) Note: The figure shows the DA-250F. 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. 12 for the removable terminal plug connection. Step 4. Connect speakers to the Speaker outpu
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[1 input - 4 outputs] Speaker output terminals CH4 CH3 CH2 CH1 CH1 Switch Setting - + - + - + - + CH1 BRIDGE 1 OFF DA-250F DA-250FH CH2 BRIDGE 2 OFF + 4 – 8 Ω 19.6 Ω CH 1 mode ON – CH3 + 4 – 8 Ω 19.6 Ω – CH4 + 4 – 8 Ω 19.6 Ω – + 4 – 8 Ω 19.6 Ω – [2 inputs - 2 outputs] Speaker output terminals CH1 Switch Setting CH1 BRIDGE 1 ON CH2 - + - + BRIDGE 2 ON BRIDGE 2 BRIDGE 1 DA-250F DA-250FH CH 1 mode OFF CH3 + 8 Ω 39.2 Ω CH3 – CH4 + 8 Ω 39.2 Ω – [1 input - 2 outputs] Speaker output terminals CH1 Switc
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[1 input - 3 outputs (1)] Speaker output terminals CH2 CH1 CH1 Switch Setting - + - + CH1 BRIDGE 1 OFF DA-250F DA-250FH CH2 BRIDGE 2 ON - + BRIDGE 2 + 4 – 8 Ω 19.6 Ω CH 1 mode ON – CH3 + 4 – 8 Ω 19.6 Ω – + CH4 8 Ω 39.2 Ω – [1 input - 3 outputs (2)] Speaker output terminals CH4 CH3 CH1 Switch Setting - + - + CH1 BRIDGE 1 ON CH2 - + BRIDGE 2 OFF BRIDGE 1 CH 1 mode ON DA-250F DA-250FH CH3 + 8 Ω 39.2 Ω – CH4 + 4 – 8 Ω 19.6 Ω – + 4 – 8 Ω 19.6 Ω – 9. REMOVABLE TERMINAL PLUG CONNECTION Cautions • Be su
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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. To avoid electric shock, do not perform any servicing other than that contained in the operating instructions unless you are qualified to do so. Refer all servicing to
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11. PROTECTION OPERATION LIST Failure Protection Operation Indicator Remedy Recovery Overcurrent due Current limiter activated Peak indicator lights. Remove overload. Connecting a correct load to overload when impedance drops automatically restores below the specified normal operation. value. Short circuit Current limiter activated. Protection indicator Check speakers Turn off this unit's Power Load is disconnected. lights. and lines for short switch. Correct the load, circuit. then turn
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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 2 Detach the panel by pressing on the left or right sides. 3 Filter Ventilation Panel 15
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14. BLOCK DIAGRAMS 14.1. DA-250F 16 CH 1 CH 1 INPUT OUTPUT OUTPUT 1 H relay C + E - Current Limiter +4 dB Short Detector CH 1 -10 dB Protection Circuit input level BRIDGE 1 control OUTPUT CH 1 sensitivity CH 2 INPUT OUTPUT 2 selection jumper ON relay (+4 dB/-10 dB) H + C - E Current Limiter OFF CH 2 BRIDGE 1 ON/OFF switch Short Detector OUTPUT +4 dB CH 2 Protection Circuit -10 dB input level CH 3 control CH 2 sensitivity OUTPUT CH 3 INPUT selection jumper OUTPUT 3 (+4 dB/-10 dB) relay H + C - E
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14.2. DA-250FH 17 CH 1 INPUT CH 1 OUTPUT H OUTPUT 1 C relay + E OFF - ON HPF Current Limiter 50 Hz +4 dB Short Detector CH 1 CH 1 HPF -10 dB input level BRIDGE 1 ON/OFF jumper Protection Circuit control OUTPUT CH 1 sensitivity CH 2 INPUT selection jumper OUTPUT 2 ON (+4 dB/-10 dB) H relay + C OFF - E ON HPF OFF Current Limiter CH 2 50 Hz BRIDGE 1 ON/OFF OUTPUT +4 dB Short Detector switch CH 2 HPF CH 2 -10 dB ON/OFF jumper Protection Circuit input level control CH 3 CH 2 sensitivity CH 3 INPU
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15. DIMENSIONAL DIAGRAM Unit: mm (inches) 442 (17.4) 465 (18.31) 482 (18.98) 18 31.8 (1.25) 44 (1.73) 371 (14.61) 22.5 (0.89) 401.8 (15.82)
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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), 10 k Ω, electronically-balanced, removable terminal block (3 pins) CH 1 mode ON/OFF switch (ON: CH 1 to All ch, OFF: Each ch) Rated Output 4 channels: 250 W x 4 (4 Ω), 170 W x 4 (8 Ω) 2 channels (BRIDGE): 500 W x
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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 k Ω, electronically-balanced, removable terminal block (3 pins) CH 1 mode ON/OFF switch (ON: CH 1 to All ch, OFF: Each ch) Rated Output 4 channels: 250 W x 4 (70 V line, 19.6 Ω) 2 channels (BRIDGE): 500 W x 2 (140 V line, 39.2 Ω) M4 screw termin
