TOA Electronics Stereo Amplifier DA 250F CU User Manual

OPERATING INSTRUCTIONS  
MULTICHANNEL POWER AMPLIFIERS  
DA-250F CU  
DA-250FH CU  
Note: The figure shows the DA-250F.  
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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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 or grounding-type plug. A polarized plug has two blades  
with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide  
blade or the third prong are provided for your safety. If the provided plug does not fit into your outlet, consult  
an electrician for replacement of the obsolete outlet.  
• Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and  
the point where they exit from the apparatus.  
• Only use attachments/accessories specified by the manufacturer.  
• Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer,  
or sold with the apparatus. When a cart is used, use caution when moving the  
cart/apparatus combination to avoid injury from tip-over.  
• Unplug this apparatus during lightning storms or when unused for long periods of time.  
• Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been  
damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have  
fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or  
has been dropped.  
FCC REQUIREMENTS  
Note: This equipment has been tested and found to comply with the limits for a Class A digital  
device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable  
protection against harmful interference when the equipment is operated in a commercial  
environment. This equipment generates, uses, and can radiate radio frequency energy and, if not  
installed and used in accordance with the instruction manual, may cause harmful interference to  
radio communications. Operation of this equipment in a residential area is likely to cause harmful  
interference in which case the user will be required to correct the interference at his own expense.  
• Reorient or relocate the receiving antenna.  
• Increase the separation between the equipment and receiver.  
• Connect the equipment into an outlet on a circuit different from that to which the receiver is  
connected.  
• Consult the dealer or an experienced radio/TV technician for help.  
• This Class A digital apparatus complies with Canadian ICES-003.  
• Cet appareil numérique de la classe A est conforme à la norme NMB-003 du Canada.  
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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 which could result from mishandling. Before operating your product, read this manual first and  
understand the safety symbols and messages so you are thoroughly aware of the potential safety hazards.  
Indicates a potentially hazardous situation which, if mishandled, could  
result in death or serious personal injury.  
WARNING  
Indicates a potentially hazardous situation which, if mishandled, could  
result in moderate or minor personal injury, and/or property damage.  
CAUTION  
· If you detect smoke or a strange smell coming  
from the unit.  
· If water or any metallic object gets into the unit  
· If the unit falls, or the unit case breaks  
· If the power supply cord is damaged (exposure of  
WARNING  
When Installing the Unit  
the core, disconnection, etc.)  
• Do not expose the unit to rain or an environment  
· If it is malfunctioning (no tone sounds.)  
where it may be splashed by water or other liquids,  
as doing so may result in fire or electric shock.  
• To prevent a fire or electric shock, never open nor  
remove the unit case as there are high voltage  
• Use the unit only with the voltage specified on the  
components inside the unit. Refer all servicing such  
unit. Using a voltage higher than that which is  
as modification inside the unit to qualified service  
specified may result in fire or electric shock.  
personnel.  
• Do not cut, kink, otherwise damage nor modify the  
• Do not place cups, bowls, or other containers of  
power supply cord. In addition, avoid using the  
liquid or metallic objects on top of the unit. If they  
power cord in close proximity to heaters, and never  
accidentally spill into the unit, this may cause a fire  
place heavy objects -- including the unit itself -- on  
or electric shock.  
the power cord, as doing so may result in fire or  
electric shock.  
• Do not insert nor drop metallic objects or  
flammable materials in the ventilation slots of the  
• Be sure to replace the unit's terminal cover after  
unit's cover, as this may result in fire or electric  
connection completion. Because the voltage of up  
shock.  
to 140 V is applied to the high impedance speaker  
terminals, never touch these terminals to avoid  
electric shock.  
• Do not touch a plug during thunder and lightning,  
as this may result in electric shock.  
• External wiring connected to the terminals marked  
with  
requires installation by an instructed person.  
CAUTION  
• The apparatus shall be connected to a mains  
socket outlet with a protective earthing connection.  
When Installing the Unit  
When the Unit is in Use  
• Never plug in nor remove the power supply plug  
with wet hands, as doing so may cause electric  
shock.  
• Should the following irregularity be found during  
use, immediately switch off the power, disconnect  
the power supply plug from the AC outlet and  
contact your nearest TOA dealer. Make no further  
attempt to operate the unit in this condition as this  
may cause fire or electric shock.  
• When unplugging the power supply cord, be sure  
to grasp the power supply plug; never pull on the  
cord itself. Operating the unit with a damaged  
power supply cord may cause a fire or electric  
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shock.  
When the Unit is in Use  
• 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.  
• Make sure that all volume controls are set to  
minimum position before power is switched on.  
Loud noise produced at high volume when power is  
switched on can impair hearing.  
• Do not operate the unit for an extended period of  
time with the sound distorting. This is an indication  
of a malfunction, which in turn can cause heat to  
generate and result in a fire.  
• Do not block the ventilation panels on the front.  
Doing so may cause heat to build up inside the unit  
and result in fire.  
• Contact your TOA dealer as to the cleaning. If dust  
is allowed to accumulate in the unit over a long  
period of time, a fire or damage to the unit may  
result.  
• 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.  
• If dust accumulates on the power supply plug or in  
the wall AC outlet, a fire may result. Clean it  
periodically. In addition, insert the plug in the wall  
outlet securely.  
• To avoid electric shocks, be sure to switch off the  
unit's power when connecting speakers.  
• The DA-250F and DA-250FH are designed  
exclusively to be mounted in an equipment rack.  
Be sure to follow the instructions below when rack-  
mounting the unit. Failure to do so may cause a fire  
or personal injury.  
• Switch off the power, and unplug the power supply  
plug from the AC outlet for safety purposes when  
cleaning or leaving the unit unused for 10 days or  
more. Doing otherwise may cause a fire or electric  
shock.  
· Install the equipment rack on a stable, hard floor.  
Fix it with anchor bolts or take other  
arrangements to prevent it from falling down.  
· Be sure to use the screws with a diameter of over  
5 mm and length of over 12 mm to mount the  
unit.  
An all-pole mains switch with a contact  
separation of at least 3 mm in each pole shall be  
incorporated in the electrical installation of the  
building.  
· When connecting the unit's power cord to an AC  
outlet, use the AC outlet with current capacity  
allowable to the unit.  
The lighting flash with arrowhead symbol,  
within an equilateral triangle, is intended  
to alert the user to the presence of  
uninsulated "dangerous voltage" within  
the product's enclosure that may be of  
sufficient magnitude to constitute a risk of  
electric shock to persons.  
5
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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 output) and 170 W x 4 channels (8 Ω  
output), and the DA-250FH features a 250 W x 4 channels (19.6 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 for DA-250F, 39.2 for DA-250FH) x 2 channels or a 3-channel amplifier of 500 W (8  
) + 250 W (4 ) x 2 channels for DA-250F, 500 W (39.2 ) + 250 W (19.6 ) x 2 channels for DA-250FH.  
Their wide range of applications include stores and permanent sound systems.  
4. FEATURES  
• 1U rack mounting size*.  
• Low power consumption and light weight.  
• An input signal to Channel 1 can be routed to all channels, and the output volume adjusted using the input  
volume control for each channel.  
• Electronically-balanced inputs.  
• Input terminals employ removable terminal blocks to provide maximum connection ease.  
• Input/output status LED indicators for each channel.  
• Built-in protection circuitry disconnects the output when a short circuit, overload, or unusual temperature rise  
occurs.  
* 1U size = 44.5 mm (reference size)  
5. HANDLING PRECAUTIONS  
• Keep the input cable away from the output cable. If installed close to each other, oscillation could occur.  
• To avoid unit failures, never connect outputs of two or more units in parallel.  
• Only connect speakers with an impedance equal to or greater than those specified. Connecting speakers  
with a smaller than specified impedance could cause damage to the unit.  
• Periodically clean the filter located inside the ventilation panel on the unit's front panel. If the filter becomes  
clogged, heat will become trapped inside the enclosure.  
• Install the unit in locations where the temperature is between –10 and +40°C and the moisture is less than  
90% (no dew condensation must be formed).  
• To clean, be sure to first switch off the unit's power, then wipe with a dry cloth. When the unit gets very dirty,  
use a cloth damped in a neutral cleanser. Never use benzene, thinner, alcohol, or chemically-treated  
cleaning cloth because such volatile liquids could deform or discolor the unit.  
6
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6. INSTALLATION 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 the unit in the rack, also mount a Perforated Panel larger than 1U in size*:  
(1) at the top and the bottom of the rack, and  
(2) above and below every 5 units.  
Power amplifiers  
DA-250F/250FH  
Power amplifiers  
DA-250F/250FH  
Perforated panel  
Robust structure is one of the unit's main features. However, if the strength is particularly needed when  
installing the unit in the rack, use a supporting runner for the safety purposes.  
Rack mounting screws are not supplied with the unit. Be sure to use the screws with a diameter of over 5  
mm and length of over 12 mm to mount the unit.  
* 1U size = 44.5 mm (reference size)  
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7. NOMENCLATURE AND FUNCTIONS  
[Front]  
3
4
5
2
1
Note: The figure shows the DA-250F.  
4. Ventilation panel (Air Vent)  
1. Power switch [  
ON/  
OFF]  
A filter is located inside the ventilation panel.  
To clean the filter, remove the ventilation panel.  
(See p. 15; Cleaning the Filter.)  
Power is switched on and off with each  
depression of this switch.  
2. Power indicator [POWER]  
5. Indicators [INPUT, OUTPUT, PEAK, PROTECT]  
Lights blue when the power is switched on.  
The indicators are as follows from left to right:  
3. Input volume controls [CH 1 (BRIDGE 1), CH 2,  
CH 3 (BRIDGE 2), CH 4]  
• Input indicator [INPUT]  
Lights green regardless of the input volume  
control setting when an input signal level exceeds  
about 20 dB.  
Adjust the input volume of each channel.  
When a bridge connection is made  
When Channels 1 and 2 are bridge-  
connected (BRIDGE 1 ON/OFF button (9) is  
set to ON), the CH 1/BRIDGE 1 volume  
control adjusts the input volumes of Channels  
1 and 2. In this event, the CH 2 volume  
control cannot be used.  
When Channels 3 and 4 are bridge-  
connected (BRIDGE 2 ON/OFF button (9) is  
set to ON), the CH 3/BRIDGE 2 control  
adjusts the input volumes of Channels 3 and  
4. In this event, the CH 4 volume control  
cannot be used.  
• Output indicator [OUTPUT]  
Lights yellow when an output level exceeds about  
1W at an 8 load (DA-250F) or 19.6 load (DA-  
250FH).  
• Peak indicator [PEAK]  
Lights red when an output signal clips (distortion  
occurs).  
• Protection indicator [PROTECT]  
Lights red when the protection circuitry is  
activated. (See p. 14; Protection Operation List.)  
When the power is switched on, this indicator  
lights for about 2 seconds and then extinguishes.  
8
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[Rear]  
6
7
8
9
10  
11  
9
Note: The figure is common to DA-250F and DA-250FH.  
6. AC inlet  
3-channel input mode  
Connect the supplied power cord to this inlet.  
Set either BRIDGE1 or 2 to ON.  
When bridge-connecting Channels 1 and 2, set  
BRIDGE1 to ON, and BRIDGE 2 to ON when  
bridge-connecting Channels 3 and 4.  
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.  
2-channel input mode  
Set both BRIDGE1 and 2 to ON.  
Note  
Note  
Be sure to first turn off the power switch when  
This terminal is not for protective ground.  
changing the BRIDGE button settings.  
8. Speaker output terminals (with a terminal  
cover)  
10. CH1 mode ON/OFF button [CH 1 TO ALL,  
ON/  
OFF]  
Connect speaker cables to these terminals.  
Setting this button to ON (pressed in) transmits  
the Channel 1 input signal to all channels. Output  
signal levels can be individually adjusted with  
each channel's input volume control (3).  
9. BRIDGE ON/OFF buttons [BRIDGE1, 2,  
ON/  
OFF]  
Set these buttons to OFF (protruding) in normal  
operation. When using the unit in bridge  
connection, set either or both buttons to ON  
(pressed in) and change speaker terminal wiring.  
(See p. 10.)  
The unit's input mode changes as follows  
depending on the BRIDGE ON/OFF button  
setting:  
Note  
Be sure to first turn off the power switch when  
changing the CH 1 mode button settings.  
11. Input terminals [INPUTS]  
Electronically-balanced inputs of 3P removable  
terminal block type.  
(H: Hot, C: Cold, E: Earth)  
4-channel input mode  
Set both BRIDGE 1 and 2 buttons to OFF.  
9
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8. CONNECTIONS  
8.1. Procedure  
Step 1. Switch off the unit's power.  
BRIDGE 2  
BRIDGE 1  
ON/OFF button  
ON/OFF button  
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.  
CH 1 mode ON/OFF button  
Step 4. Connect speakers to the Speaker output terminals.  
4-1. Unscrew the output terminal cover.  
4-2. Strip 10 mm of insulative jacket from the end of the  
speaker cable, as shown in the figure at right.  
4-3. Connect speaker cables to the output terminals.  
10 mm  
4-4. Replace the output terminal cover in place.  
Be sure to replace the unit's terminal cover after connection  
completion. Because high voltage is generated at the speaker output  
terminals, never touch these terminals to avoid electric shock.  
WARNING  
8.2. Button Settings and Speaker Connections  
[4 inputs - 4 outputs]  
Speaker output terminals  
CH4 CH3 CH2 CH1  
CH1  
CH2  
CH3  
CH4  
-
+
-
+
-
+
-
+
Button  
Setting  
OFF  
CH1  
CH2  
CH3  
CH4  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
DA-250F  
DA-250FH  
OFF  
+
4 8  
19.6 Ω  
OFF  
+
4 8 Ω  
4 8 Ω  
4 8 Ω  
19.6 Ω  
19.6 Ω  
19.6 Ω  
+
+
[1 input - 4 outputs]  
Speaker output terminals  
CH4 CH3 CH2 CH1  
CH1  
-
+
-
+
-
+
-
+
Button  
Setting  
OFF  
OFF  
ON  
CH1  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
DA-250F  
DA-250FH  
CH2  
CH3  
CH4  
+
4 8 Ω  
19.6 Ω  
+
4 8 Ω  
4 8 Ω  
4 8 Ω  
19.6 Ω  
19.6 Ω  
19.6 Ω  
+
+
10  
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[2 inputs - 2 outputs]  
Speaker output terminals  
CH1  
Button  
Setting  
ON  
CH1  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
CH2  
-
+
-
+
ON  
BRIDGE 2  
BRIDGE 1  
DA-250F  
DA-250FH  
OFF  
CH3  
+
8 16 Ω  
39.2 Ω  
CH3  
+
CH4  
8 16 Ω  
39.2 Ω  
[1 input - 2 outputs]  
Speaker output terminals  
CH1  
Button  
Setting  
ON  
CH1  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
CH2  
CH3  
CH4  
-
+
-
+
BRIDGE 2  
BRIDGE 1  
ON  
DA-250F  
DA-250FH  
ON  
+
8 16 Ω  
39.2 Ω  
+
8 16 Ω  
39.2 Ω  
[3 inputs - 3 outputs (1)]  
Speaker output terminals  
CH2 CH1  
CH1  
-
+
-
+
Button  
Setting  
OFF  
ON  
CH1  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
DA-250F  
DA-250FH  
CH2  
-
+
+
BRIDGE 2  
CH2  
4 8 Ω  
19.6 Ω  
OFF  
+
CH3  
4 8 Ω  
19.6 Ω  
CH3  
+
CH4  
8 16 Ω  
39.2 Ω  
[3 inputs - 3 outputs (2)]  
Speaker output terminals  
CH4 CH3  
-
+
-
+
CH1  
Button  
Setting  
ON  
CH1  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
CH2  
-
+
OFF  
OFF  
BRIDGE 1  
DA-250F  
DA-250FH  
CH3  
+
CH3  
8 16 Ω  
39.2 Ω  
+
CH4  
CH4  
4 8 Ω  
19.6 Ω  
+
4 8 Ω  
19.6 Ω  
[1 input - 3 outputs (1)]  
Speaker output terminals  
CH2 CH1  
CH1  
-
+
-
+
Button  
Setting  
OFF  
ON  
CH1  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
DA-250F  
DA-250FH  
CH2  
CH3  
CH4  
-
+
BRIDGE 2  
+
4 8 Ω  
19.6 Ω  
ON  
+
4 8 Ω  
19.6 Ω  
+
8 16 Ω  
39.2 Ω  
11  
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[1 input - 3 outputs (2)]  
Speaker output terminals  
CH4 CH3  
-
+
-
+
CH1  
Button  
Setting  
ON  
CH1  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
CH2  
CH3  
CH4  
-
+
OFF  
ON  
BRIDGE 1  
DA-250F  
DA-250FH  
+
8 16 Ω  
4 8 Ω  
4 8 Ω  
39.2 Ω  
+
19.6 Ω  
+
19.6 Ω  
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.  
Use cables of AWG 12 24.  
Cable end treatment  
Shielded cable  
7 mm  
20 mm  
Connector connections  
Slotted screwdriver  
Step 1. Loosen the terminal screw, then insert the  
Tightens  
cable.  
Loosens  
2
1
Step 2. Retighten the terminal screw. (Pull on the  
cable to ensure it is securely connected.)  
Terminal screw  
1
Hot  
Removable terminal plug  
Earth  
Cold  
Shielded cable  
Tip  
Recommended slotted screwdriver type: Screwdriver with blade that is 3 mm in width  
Bit shape 3 mm  
12  
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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 qualified service personnel.  
Step 1. Detach the top cover of the unit.  
Step 2. Change the jumper socket position to "+4 dB" or "10 dB" for the Input sensitivity, and to "ON" or  
"OFF" for the High-pass filter (DA-250FH only) as illustrated below.  
High-pass filter setting (DA-250FH only)  
[When set to ON]  
[When set to OFF]  
Jumper socket  
Jumper socket  
(Factory-preset)  
DA-250F/250FH  
(Viewed from top with the  
top cover detached.)  
Front panel  
Input sensitivity setting  
[When set to +4 dB]  
Jumper socket  
[When set to 10 dB]  
Jumper socket  
(Factory-preset)  
Note  
To operate the unit in bridge connection, perform the same setting for the channels to be used  
(Channels 1 and 2, Channels 3 and 4, or all channels).  
Operating the unit with the different setting may cause unit failure.  
Step 3. Replace the detached top cover.  
13  
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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  
automatically restores  
normal operation.  
to overload  
Short circuit  
when impedance drops  
below the specified  
value.  
Current limiter activated. Protection indicator  
Check speakers and  
lines for short circuit.  
Turn off the power switch.  
Correct the load, then  
switch on the power.  
Load is disconnected.  
lights.  
Rise in heat sink Load disconnected.  
temperature  
(over 110°C)  
Protection indicator  
lights.  
Check the unit for  
correct ventilation and returns to normal when  
overload. the temperature decreases.  
Operation automatically  
Temperature rise Built-in amplifier unit  
Four indicators of  
the corresponding  
channel extinguish.  
inside the unit  
that caused the failure  
halted.  
(over 80°C)  
Abnormal DC  
voltage output  
Load disconnected.  
Protection indicator  
lights.  
Contact the TOA dealer where the unit was  
purchased.  
12. VOLUME CONTROL CAP ATTACHMENT  
To protect the input volume control from accidental operation, it is recommended to replace the control knob  
with the supplied volume control cap as illustrated.  
Input volume control  
Volume control cap (supplied)  
14  
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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.  
2
Ventilation Panel  
Detach the panel by pressing on the left and right sides.  
3
Filter  
15  
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14. BLOCK DIAGRAMS  
14.1. DA-250F  
16  
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14.2. DA-250FH  
17  
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15. DIMENSIONAL DIAGRAM  
Unit: mm  
465  
482  
18  
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16. SPECIFICATIONS  
Model  
DA-250F CU  
DA-250FH CU  
Power Source  
Power Consumption  
120 V AC, 50/60 Hz  
200 W (at 1/8 rated output x 4 channels)  
4 channels: 250 W x 4 (4 ), 4 channels: 250 W x 4 (19.6 )  
Output  
170 W x 4 (8 )  
2 channels (bridge connection):  
500 W x 2 (8 )  
2 channels (bridge connection):  
500 W x 2 (39.2 )  
Frequency Response  
20 Hz 20 kHz ( 1 dB)  
50 Hz 20 kHz (3 dB, +0 dB) (HPF ON)  
20 Hz 20 kHz ( 1 dB) (HPF OFF)  
0.15% (1 kHz)  
Total Harmonic  
Distortion  
0.15% (1 kHz)  
0.3% (20 Hz 20 kHz)  
0.3% (100 Hz 20 kHz) (HPF ON)  
0.3% (20 Hz 20 kHz) (HPF OFF)  
Input Sensitivity  
Input Impedance  
S/N Ratio  
+4 dB* (1.23 V) / 10 dB* (0.24 V) (selectable with the inner jumper)  
electronically-balanced  
10 k(  
100 dB  
)
Connection  
Terminal  
Input (CH 1 4): Removable terminal block  
Output:  
M4 screw terminal  
AC inlet  
Power input:  
Indicator  
Power indicator x 1 (blue), Input indicator x 4 (green), Output indicator x 4 (yellow)  
Peak indicator x 4 (red), Protection indicator x 4 (red)  
10 to +40°C  
Operating Temperature  
Humidity  
90 % or less (no dew condensation must be formed.)  
Front panel: Aluminum, alumite process, black  
482. (w) x 44 (h) x 400 (d) mm  
Finish  
Dimensions  
Weight  
6.6 kg  
* 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 .............................................................. 4  
19  
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Printed in Japan  
133-22-027-00  
Download from Www.Somanuals.com. All Manuals Search And Download.  

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