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.
TABLE OF CONTENTS 1. IMPORTANT SAFETY INSTRUCTIONS .................................................... 3 2. SAFETY PRECAUTIONS ............................................................................... 4 3. GENERAL DESCRIPTION ............................................................................. 6 4. FEATURES .......................................................................................................... 6 5. HANDLING PRECAUTIONS ......................................................
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.
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.
• 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. • Avoid installing the unit in humid or dusty locations, in locations exposed to the direct sunlight, near the heaters, or in locations generating sooty smoke or steam as doing otherwise may result in fire or electric shock.
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.
6. INSTALLATION PRECAUTIONS CAUTION 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 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.
7. NOMENCLATURE AND FUNCTIONS [Front] 3 4 5 2 1 Note: The figure shows the DA-250F. 1. Power switch [ ON / OFF] 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. 2. Power indicator [POWER] Lights blue when the Power switch (1) is turned on. 3.
[Rear] 6 7 8 9 10 9 DA-250F 11 6 7 8 9 10 9 DA-250FH 11 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. Connecting this terminal to the functional ground terminal of the external equipment may reduce the hum noise.
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 (with a terminal cover) Input terminals 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.
[1 input - 4 outputs] Speaker output terminals CH4 CH3 CH2 CH1 - - - - Switch Setting BRIDGE 1 OFF BRIDGE 2 OFF + CH 1 mode ON CH3 – + CH4 – + CH1 CH1 CH2 + + + + – + – DA-250F DA-250FH 4–8Ω 19.6 Ω 4–8Ω 19.6 Ω 4–8Ω 19.6 Ω 4–8Ω 19.6 Ω [2 inputs - 2 outputs] CH1 CH1 CH2 Switch Setting BRIDGE 1 ON BRIDGE 2 ON CH 1 mode OFF Speaker output terminals BRIDGE 2 - + - + BRIDGE 1 CH3 + CH4 – + CH3 DA-250F DA-250FH 8Ω 39.2 Ω 8Ω 39.
[1 input - 3 outputs (1)] CH1 CH1 CH2 Speaker output terminals Switch Setting BRIDGE 1 OFF BRIDGE 2 ON CH 1 mode ON BRIDGE 2 - CH2 CH1 - - + + DA-250F DA-250FH 4–8Ω 19.6 Ω 4–8Ω 19.6 Ω 8Ω 39.2 Ω DA-250F DA-250FH 8Ω 39.2 Ω 4–8Ω 19.6 Ω 4–8Ω 19.6 Ω + + CH3 – + CH4 – + – [1 input - 3 outputs (2)] Speaker output terminals Switch CH1 CH1 CH2 Setting BRIDGE 1 ON BRIDGE 2 OFF CH 1 mode ON CH4 CH3 - - + + - + BRIDGE 1 CH3 + – + CH4 – + – 9.
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.
11. PROTECTION OPERATION LIST Failure Protection Operation Indicator Overcurrent due to overload Current limiter activated when impedance drops below the specified value. Short circuit Current limiter activated. Protection indicator Load is disconnected. lights. Peak indicator lights. Remove overload. Temperature rise Load disconnected. at power amp. heat sink (over 110°C or 230°F) Protection indicator lights.
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 Filter 3 Detach the panel by pressing on the left or right sides.
H C E H C E H C E H C E CH 4 INPUT CH 3 INPUT CH 2 INPUT CH 1 INPUT CH 1 TO ALL switch CH 4 input level control CH 3 input level control CH 2 input level control CH 1 input level control +4 dB CH 4 sensitivity selection jumper (+4 dB/-10 dB) -10 dB +4 dB CH 3 sensitivity selection jumper (+4 dB/-10 dB) -10 dB +4 dB CH 2 sensitivity selection jumper (+4 dB/-10 dB) -10 dB +4 dB CH 1 sensitivity selection jumper (+4 dB/-10 dB) -10 dB OFF BRIDGE 2 ON/OFF switch ON OFF BRIDGE 1 ON/
H C E H C E H C E H C E CH 4 INPUT CH 3 INPUT CH 2 INPUT CH 1 INPUT CH 1 TO ALL switch CH 4 input level control CH 3 input level control CH 2 input level control CH 1 input level control CH 4 sensitivity selection jumper (+4 dB/-10 dB) -10 dB +4 dB CH 3 sensitivity selection jumper (+4 dB/-10 dB) -10 dB +4 dB CH 2 sensitivity selection jumper (+4 dB/-10 dB) -10 dB +4 dB CH 1 sensitivity selection jumper (+4 dB/-10 dB) -10 dB +4 dB OFF BRIDGE 2 ON/OFF switch ON OFF BRIDGE 1 ON/OFF
15. DIMENSIONAL DIAGRAM 465 (18.31) 482 (18.98) 18 (1.73) 44 (1.25) 31.8 371 (14.61) (0.89) 442 (17.4) 401.8 (15.82) 22.
16. SPECIFICATIONS 16.1. DA-250F 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 120 V AC, 50/60 Hz Class D 200 W (based on UL/CSA standards) 1300 W (rated output 4 Ω x 4) 850 W (rated output 8 Ω x 4) 4 circuits, +4 dB* (1.
16.2. DA-250FH 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 120 V AC, 50/60 Hz Class D 200 W (based on UL/CSA standards) 1200 W (rated output 70 V line, 19.6 Ω x 4) 4 circuits, +4 dB* (1.
