TOA Electronics Stereo Amplifier DA 550F CE User Manual

OPERATING INSTRUCTIONS  
MULTICHANNEL POWER AMPLIFIERS  
DA-550F CE  
DA-500FH CE  
Note: The figure shows the DA-550F.  
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. 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  
• To prevent a fire or electric shock, never open nor  
remove the unit case as there are high voltage  
WARNING  
as modification inside the unit to qualified service  
components inside the unit. Refer all servicing such  
When Installing the Unit  
personnel.  
• 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.  
• Do not place cups, bowls, or other containers of  
liquid or metallic objects on top of the unit. If they  
accidentally spill into the unit, this may cause a 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 insert nor drop metallic objects or flammable  
materials in the ventilation slots of the unit's cover,  
as this may result in fire or electric shock.  
• Do not cut, kink, otherwise damage nor modify the  
power supply cord. In addition, avoid using the  
power cord in close proximity to heaters, and never  
place heavy objects -- including the unit itself -- on  
the power cord, as doing so may result in fire or  
electric shock.  
• Do not touch a plug during thunder and lightning,  
as this may result in electric shock.  
CAUTION  
• Be sure to replace the unit's terminal cover after  
connection completion. Because the voltage of up  
to 100 V is applied to the high impedance speaker  
terminals, never touch these terminals to avoid  
electric shock. (DA-500FH only)  
When Installing the Unit  
• Never plug in nor remove the power supply plug with  
wet hands, as doing so may cause electric shock.  
• External wiring connected to the terminals marked  
with requires installation by an instructed person.  
• 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 shock.  
• The apparatus shall be connected to a mains  
socket outlet with a protective earthing connection.  
• 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.  
When the Unit is in Use  
• 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.  
· 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  
the core, disconnection, etc.)  
• 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.  
• To avoid electric shocks, be sure to switch off the  
unit's power when connecting speakers.  
· If it is malfunctioning (no tone sounds.)  
3
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• The unit is 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.  
• 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.  
· Install the equipment rack on a stable, hard floor.  
Fix it with anchor bolts or take other arrangements  
to prevent it from falling down.  
· The supplied rack-mounting screws can be used  
for the TOA equipment rack only. Do not use  
them for other racks.  
· When installing the unit in a rack other than that  
of TOA, be sure to use the screws with a  
diameter of over 5 mm and length of over 12 mm  
to mount the unit.  
• 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.  
• 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.  
· When connecting the unit's power cord to an AC  
outlet, use the AC outlet with current capacity  
allowable to 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 the Unit is in Use  
• 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.  
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.  
• 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.  
2. GENERAL DESCRIPTION  
TOA's DA-550F Multichannel Power Amplifier features high power handling of 550 W x 4 channels (4 Ω  
output) or 350 W x 4 channels (8 Ω output) and durability. Besides, its channels 1 and 2, and 3 and 4 are  
made available for bridge connection individually, allowing it to be used as a 1,100 W (8 Ω) x 2 channels  
stereo amplifier or as a 3-channel amplifier comprised of 1,100 W (8 Ω) + 550 W (4 Ω) x 2 channels.  
The DA-500FH Multichannel Power Amplifier features high power handling of 500 W (100 V line) x 4 channels  
(20 Ω output) and durability.  
Their wide range of applications include stores and permanent sound systems.  
3. FEATURES  
• 2U rack mounting size*.  
• Low power consumption and light weight.  
• An input signal to Channel 1 can be routed to all channels, and the output level adjusted using the input level  
control for each channel.  
• Electronically-balanced inputs.  
• Input terminals employ removable terminal blocks and XLR type connectors 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.  
• Equipped with the terminals used for internal information monitoring (power supply, protection status, and  
fan operation) and power ON/OFF control from external equipment.  
* 1U size = 44.5 mm (reference size)  
4
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4. 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 2 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°C and +40°C and the moisture is less than  
90%RH (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.  
5. INSTALLATION PRECAUTIONS  
The supplied rack-mounting screws can be used for the TOA equipment  
rack only. Do not use them for other racks.  
When installing the unit in a rack other than that of TOA, be sure to use  
CAUTION  
the screws with a diameter of over 5 mm and length of over 12 mm 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, 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-550F/500FH  
Perforated panel  
Power amplifiers  
DA-550F/500FH  
* 1U size = 44.5 mm (reference size)  
5
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6. NOMENCLATURE AND FUNCTIONS  
[Front]  
3
4
5
2
2
1
1
DA-550F  
3
4
5
DA-500FH  
1. Power switch [ON/OFF]  
4. Ventilation panel (Air Vent)  
Power is switched on and off with each depression  
of this switch.  
A filter is located inside the ventilation panel.  
To clean the filter, remove the ventilation panel.  
(See p. 13; Cleaning the Filter.)  
2. Power indicator [POWER]  
Lights blue when the power is switched on.  
5. Indicators [INPUT, OUTPUT, PEAK, PROTECT]  
The indicators are as follows from left to right:  
3. Input level controls  
• Input indicator [INPUT]  
[CH 1 (BRIDGE 1), CH 2, CH 3 (BRIDGE 2), CH 4]  
Adjust the input level of each channel.  
Lights green regardless of the input level control  
setting when an input signal level exceeds about  
–20 dB.  
• Output indicator [OUTPUT]  
When a bridge connection is made  
(DA-550F only)  
Lights yellow when an output level exceeds  
about 1 W at an 8 Ω load (DA-550F) or 20 Ω  
load (DA-500FH).  
• When Channels 1 and 2 are bridge-  
connected (BRIDGE 1 ON/OFF switch (10)  
is set to ON), the CH 1/BRIDGE 1 level  
control adjusts the input levels of Channels 1  
and 2. In this event, the CH 2 level control  
cannot be used.  
• Peak indicator [PEAK]  
Lights red when an output signal clips (distortion  
occurs).  
• Protection indicator [PROTECT]  
• When Channels 3 and 4 are bridge-  
connected (BRIDGE 2 ON/OFF switch (10)  
is set to ON), the CH 3/BRIDGE 2 level  
control adjusts the input levels of Channels 3  
and 4. In this event, the CH 4 level control  
cannot be used.  
Lights red when the protection circuitry is  
activated. (See p. 12; Protection Operation List.)  
When the power is switched on, this indicator  
lights for about 2 seconds and then extinguishes.  
6
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[Rear]  
6
6
7
7
8
8
9
9
9
9
10 11 10  
DA-550F  
12  
12  
11  
DA-500FH  
6. AC inlet  
10. BRIDGE ON/OFF switches (DA-550F only)  
[BRIDGE 1, BRIDGE 2, ON / OFF]  
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.  
Used when bridge-connecting the unit's  
Channels 1 and 2, and Channels 3 and 4.  
(See p. 8; Settings and Connections.)  
• 4-channel input mode  
Set both BRIDGE 1 and 2 switches to OFF.  
(factory-preset)  
7. Control/Monitor terminals  
[CONTROL/MONITOR]  
Connecting external equipment to these terminals  
makes the control and monitor functions available  
for channels 1 – 4 individually.  
(See p.15; How to Use the Control/Monitor  
Terminals.)  
• 3-channel input mode  
Set either BRIDGE 1 or 2 switches to ON.  
When bridge-connecting Channels 1 and 2, set  
BRIDGE 1 switches to ON, and BRIDGE 2  
switches to ON when bridge-connecting  
Channels 3 and 4.  
8. Speaker output terminals (with a terminal cover)  
[OUTPUTS (DA-550F), OUTPUTS 100 V (DA-500FH)]  
Connect speaker cables to these terminals.  
• 2-channel input mode  
Set both BRIDGE 1 and 2 switches to ON.  
Note: Be sure to first turn off the power switch  
when changing the BRIDGE switch settings.  
9. Input terminals [INPUTS]  
Electronically-balanced input terminals.  
Each removable terminal block (3 pins) is  
internally connected in parallel to the  
corresponding XLR type connector.  
11. CH 1 mode ON/OFF switch  
[CH 1 TO ALL,  
ON /  
OFF]  
Setting this switch 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 level control (3).  
• Removable terminal block (3 pins)  
H: Hot, C: Cold, E: Earth  
XLR type male connector (XLR-3-31 equivalent)  
Pin 1: Earth, Pin 2: Hot, Pin 3: Cold  
Note: Be sure to first turn off the power switch when  
changing the CH 1 mode switch settings.  
Caution when using an XLR type plug  
12. 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.  
If a straight plug hits the rack's rear cover or  
wall behind the rack when it is used for  
connection, use the L-shaped plug instead.  
Note: This terminal is not for protective earth.  
7
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7. SETTINGS AND CONNECTIONS  
CH 1 mode ON/OFF switch  
BRIDGE 2 ON/OFF switch  
(DA-550F only)  
BRIDGE 1 ON/OFF switch  
(DA-550F only)  
[Rear panel]  
Speaker output terminals  
(with a terminal cover)  
Input terminals  
Note: The figure shows the DA-550F.  
Step 1. Switch off the unit's power.  
Step 2. Set the BRIDGE ON/OFF switches (DA-550F only) and CH 1 mode ON/OFF switch.  
Step 3. Connect the sound source equipment to the Input terminals.  
Note: Refer to p. 11 for the removable terminal plug connection.  
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.  
10 mm  
4-3. Connect speaker cables to the output terminals.  
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. (DA-500FH only)  
WARNING  
7.1. Switch Settings and Speaker Connections  
7.1.1. When using the DA-550F  
[4 inputs - 4 outputs] (factory-preset)  
CH4 CH3 CH2 CH1  
-
+
-
+
-
+
-
+
CH1  
CH2  
CH3  
CH4  
Switch  
Setting  
OFF  
Speaker output terminals  
4 – 8 Ω  
CH1  
CH2  
CH3  
CH4  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
OFF  
OFF  
4 – 8 Ω  
4 – 8 Ω  
4 – 8 Ω  
8
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[1 input - 4 outputs]  
CH4 CH3 CH2 CH1  
-
+
-
+
-
+
-
+
CH1  
Switch  
Setting  
OFF  
OFF  
ON  
Speaker output terminals  
4 – 8 Ω  
CH1  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
CH2  
CH3  
CH4  
4 – 8 Ω  
4 – 8 Ω  
4 – 8 Ω  
[2 inputs - 2 outputs]  
CH1  
Switch  
Setting  
ON  
Speaker output terminals  
CH1  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
-
-
-
+
+
+
-
+
BRIDGE 1  
BRIDGE 2  
BRIDGE 2  
BRIDGE 2  
CH2  
ON  
OFF  
8 Ω  
8 Ω  
CH3  
CH3  
CH4  
[1 input - 2 outputs]  
CH1  
Switch  
Setting  
ON  
ON  
ON  
Speaker output terminals  
CH1  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
-
+
BRIDGE 1  
CH2  
CH3  
CH4  
8 Ω  
8 Ω  
[3 inputs - 3 outputs (1)]  
CH2 CH1  
-
+
-
+
CH1  
Switch  
Setting  
OFF  
ON  
Speaker output terminals  
4 – 8 Ω  
CH1  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
CH2  
CH2  
OFF  
4 – 8 Ω  
8 Ω  
CH3  
CH3  
CH4  
[3 inputs - 3 outputs (2)]  
CH4 CH3  
-
+
-
+
CH1  
Switch  
Setting  
ON  
OFF  
OFF  
Speaker output terminals  
CH1  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
-
+
BRIDGE 1  
CH2  
8 Ω  
CH3  
CH4  
4 – 8 Ω  
4 – 8 Ω  
CH3  
CH4  
9
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[1 input - 3 outputs (1)]  
CH2 CH1  
-
+
-
+
CH1  
Switch  
Setting  
OFF  
ON  
Speaker output terminals  
4 – 8 Ω  
CH1  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
-
+
BRIDGE 2  
CH2  
CH3  
CH4  
ON  
4 – 8 Ω  
8 Ω  
[1 input - 3 outputs (2)]  
CH4 CH3  
-
+
-
+
CH1  
CH1  
Switch  
Setting  
ON  
OFF  
ON  
Speaker output terminals  
BRIDGE 1  
BRIDGE 2  
CH 1 mode  
-
+
BRIDGE 1  
CH2  
CH3  
CH4  
8 Ω  
4 – 8 Ω  
4 – 8 Ω  
7.1.2. When using the DA-500FH  
[4 inputs - 4 outputs] (factory-preset)  
CH4 CH3 CH2 CH1  
-
+
-
+
-
+
-
+
CH1  
CH1  
Switch  
CH 1 mode  
Setting  
OFF  
Speaker output terminals  
20 Ω  
CH2  
CH3  
CH4  
CH2  
CH3  
CH4  
20 Ω  
20 Ω  
20 Ω  
[1 input - 4 outputs]  
CH4 CH3 CH2 CH1  
-
+
-
+
-
+
-
+
CH1  
Switch  
CH 1 mode  
Setting  
ON  
Speaker output terminals  
20 Ω  
CH1  
CH2  
CH3  
CH4  
20 Ω  
20 Ω  
20 Ω  
10  
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8. 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  
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.)  
Slotted screwdriver  
Tightens  
Loosens  
2
1
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  
11  
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9. INPUT SENSITIVITY SETTING  
The input sensitivity for each channel can be set to either +4 dB (factory preset) or –10 dB.  
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. Unscrew 9 screws securing the top cover  
of the unit, then detach it.  
[When set to +4 dB]  
[When set to –10 dB]  
Step 2. Insert the jumper socket into either "+4 dB"  
or "–10 dB" position as shown at right.  
– 1 0 d B / + 4 d B  
– 1 0 d B / + 4 d B  
When a bridge connection is made  
(DA-550F only);  
Jumper  
socket  
Jumper  
socket  
(Factory-preset)  
Set the input sensitivity with the CH1  
jumper socket when Channels 1 and 2 are  
bridge-connected. Similarly, set the input  
sensitivity with the CH3 jumper socket  
when Channels 3 and 4 are bridge-  
connected. (Input sensitivity settings for  
the CH2 and CH4 are disabled.)  
CH 1  
CH 2  
CH 3  
CH 4  
Step 3. Replace the detached top cover.  
Front panel  
Viewed from top with the top cover detached.  
10. 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  
when impedance drops  
below the specified  
value.  
Short circuit  
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.  
Temperature rise Load disconnected.  
at power amp.  
Protection indicator  
lights.  
Check the unit for  
Operation automatically  
correct ventilation and returns to normal when  
heat sink  
overload.  
the temperature decreases.  
(over 100°C)  
Temperature rise Built-in amplifier unit  
Four indicators of  
the corresponding  
channel extinguish.  
at power supply  
heat sink  
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  
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11. TAMPER-PROOF CAP ATTACHMENT  
To protect the input level control from accidental operation,  
it is recommended to replace the control knob with the  
supplied tamper-proof cap as illustrated.  
Input level control  
Tamper-proof cap  
(accessory)  
12. 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.  
Ventilation Panel  
Ventilation Panel  
2
3
Detach the panel by pressing  
on the right side.  
Filter  
13. DIMENSIONAL DIAGRAM  
442  
Unit: mm  
465  
482  
13  
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14. BLOCK DIAGRAMS  
14.1. DA-550F  
CH 1  
CH 1 INPUT  
OUTPUT  
OUTPUT 1  
relay  
H
C
E
+
-
Current Limiter  
Short Detector  
+4 dB  
10 dB  
CH 1  
input level  
control  
-
Protection Circuit  
BRIDGE 1  
OUTPUT  
CH 1 sensitivity  
OUTPUT 2  
relay  
CH 2 INPUT  
selection jumper  
ON  
(+4 dB/-10 dB)  
H
C
E
+
-
Current Limiter  
Short Detector  
OFF  
CH 2  
BRIDGE 1  
OUTPUT  
+4 dB  
10 dB  
ON/OFF switch  
CH 2  
Protection Circuit  
input level  
control  
-
CH 3  
OUTPUT  
CH 2 sensitivity  
CH 3 INPUT  
OUTPUT 3  
relay  
selection jumper  
(+4 dB/-10 dB)  
H
C
E
+
-
Current Limiter  
Short Detector  
+4 dB  
10 dB  
CH 3  
input level  
control  
-
Protection Circuit  
BRIDGE 2  
OUTPUT  
CH 3 sensitivity  
OUTPUT 4  
relay  
selection jumper  
CH 4 INPUT  
ON  
(+4 dB/-10 dB)  
H
C
E
+
-
Current Limiter  
Short Detector  
OFF  
CH 4  
CH 1 TO ALL  
BRIDGE 2  
OUTPUT  
+4 dB  
10 dB  
switch  
CH 4  
ON/OFF switch  
Protection Circuit  
input level  
control  
-
CH 4 sensitivity  
selection jumper  
(+4 dB/-10 dB)  
14.2. DA-500FH  
CH 1 INPUT  
OUTPUT 1  
relay  
H
C
E
+
CH 1  
-
OUTPUT  
Current Limiter  
Short Detector  
+4 dB  
10 dB  
CH 1  
input level  
control  
-
Protection Circuit  
CH 1 sensitivity  
selection jumper  
CH 2 INPUT  
OUTPUT 2  
relay  
(+4 dB/-10 dB)  
H
C
E
+
CH 2  
-
OUTPUT  
Current Limiter  
Short Detector  
+4 dB  
10 dB  
CH 2  
input level  
control  
-
Protection Circuit  
CH 2 sensitivity  
CH 3 INPUT  
selection jumper  
OUTPUT 3  
relay  
(+4 dB/-10 dB)  
H
C
E
+
CH 3  
-
OUTPUT  
Current Limiter  
Short Detector  
+4 dB  
10 dB  
CH 3  
input level  
control  
-
Protection Circuit  
CH 3 sensitivity  
selection jumper  
OUTPUT 4  
relay  
CH 4 INPUT  
(+4 dB/-10 dB)  
H
C
E
+
CH 4  
-
OUTPUT  
Current Limiter  
Short Detector  
CH 1 TO ALL  
+4 dB  
10 dB  
CH 4  
switch  
input level  
control  
-
Protection Circuit  
CH 4 sensitivity  
selection jumper  
(+4 dB/-10 dB)  
14  
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15. HOW TO USE THE CONTROL/MONITOR TERMINALS  
The Control/Monitor terminals on the rear panel permit power ON/OFF control of the individual channels and  
monitoring for the power ON/OFF status and protection status on each channel, and fan operation status.  
Prepare the control panel and status monitor display panel separately referring to the descriptions below.  
Notes  
• All terminals are electrically isolated from the unit body with the photocouplers.  
• A shielded wire of the connection cable is grounded to the unit chassis.  
15.1. Control Terminal (Input)  
While the unit's power switch is turned ON, each individual channel's power can be turned ON and OFF from  
the distant location using this terminal. The power indicator extinguishes only when the all channels' powers  
are turned off, but otherwise remains lit.  
Using the power supply, which you need to prepare separately, perform the control by applying DC voltage to  
the control terminal.  
This terminal is a photocoupler input, and requires max. 8 mA per control. Note the power capacity of the  
power supply.  
Control voltages are as follows.  
Terminal pin No.  
Control voltage (Vin) Power ON/OFF status on each channel  
Pin 1 or 4  
External DC power  
(Max. 14 V DC)  
0 – 3 V DC  
ON  
Vin  
9 – 14 V DC  
OFF  
Pin 7  
When controlling the control terminal with a power supply of 14 V DC or more, connect the specified  
resistance referring to the table below.  
Note: The use of the resistance other than those specified may cause unit failure.  
Control voltage (Vin)  
14 V to under 20 V DC  
20 V to under 30 V DC  
30 V to under 50 V DC  
R1 resistance value (rated power)  
1 kΩ (0.1 W or more)  
Terminal pin No.  
Pin 1 or 4  
R1  
External DC power  
(Max. 50 V DC)  
3.3 kΩ (0.25 W or more)  
5.6 kΩ (0.5 W or more)  
Vin  
Pin 7  
15.2. Monitor Terminal (Output)  
Indicators on the externally-connected device (status monitor display panel) or relays can be turned on and off  
in response to the power ON/OFF status, protection status, and fan operation status from the distant location  
using this terminal.  
This monitor terminal is a photocoupler open-collector output terminal. Note that it is rated at withstand  
voltages of 30 V DC and control current of 12 mA or less when ON.  
At the time of circuit design, consider the control current assuming that 1 V appears at the monitor terminal  
when ON.  
[Example of a circuit]  
When an LED is used  
When a relay is used  
External DC power  
(Max. 30 V DC)  
External DC power  
(Max. 30 V DC)  
Control current:  
12 mA or less  
Control current:  
12 mA or less  
Terminal pin No.  
Pin 2, 3, 5, 6, or 8  
Terminal pin No.  
Pin 2, 3, 5, 6, or 8  
Pin 7  
Pin 7  
Note  
Be sure to connect a diode across the relay in the direction  
as shown above when connecting to the external relay.  
15  
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15.3. About Pin 7 of the Control/Monitor Terminals  
A ground common to all the control and monitor terminals is assigned to Pin 7.  
Both Pins 7 of the Control/Monitor terminal for CH1 and CH2, and that for CH 3 and CH4 are internally  
connected to each other.  
Pins 7 are isolated from the unit body.  
15.4. Terminal Pin Arrangement  
Unit operation status  
Terminal Pin No.  
Pin name  
HI-LEVEL  
CH1 power OFF  
CH1 normal  
LO-LEVEL  
CH1 power ON  
CH1, 2  
CH1 power ON/OFF control (input)  
CH1 protection status (output)  
CH1 power ON/OFF status (output)  
CH2 power ON/OFF control (input)  
CH2 protection status (output)  
CH2 power ON/OFF status (output)  
GND (input/output)  
1
CH1 protection activated (irregular)  
CH1 power ON  
2
3
4
5
6
7
8
CH1 power OFF  
CH2 power OFF  
CH2 normal  
CH2 power ON  
CH2 protection activated (irregular)  
CH2 power ON  
CH2 power OFF  
Fan operation status (output)  
CH3 power ON/OFF control (input)  
CH3 protection status (output)  
CH3 power ON/OFF status (output)  
CH4 power ON/OFF control (input)  
CH4 protection status (output)  
CH4 power ON/OFF status (output)  
GND (input/output)  
Fan stop (irregular) Normal  
CH3, 4  
CH3 power OFF  
CH3 normal  
CH3 power ON  
1
CH3 protection activated (irregular)  
CH3 power ON  
2
3
4
5
6
7
8
CH3 power OFF  
CH4 power OFF  
CH4 normal  
CH4 power ON  
CH4 protection activated (irregular)  
CH4 power ON  
CH4 power OFF  
Fan operation status (output)  
Fan stop (irregular) Normal  
• About operation and terminal status  
HI-LEVEL  
LO-LEVEL  
Control terminal (input)  
Monitor terminal (output)  
9 – 14 V DC  
OFF  
0 – 3 V DC  
ON  
• The same information is output from both Pins 8 (fan status output) of the CH1 and CH2 terminal, and the  
CH3 and CH4 terminal.  
• Lighting status of the protection indicator on the front panel matches operation of protection status provided  
at the monitor terminal.  
Protection indicator (front panel)  
Protection status (output)  
Light off  
OFF  
Light on  
ON  
15.5. Connection Cable and Maximum Cable Length  
For the connection cable, use a Shielded Category 5 twisted pair cable for LAN (CAT5-STP).  
The maximum cable length is 600 m.  
16  
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15.6. RJ45 Connector's Pin Arrangement and Cable Color Codes  
To Control/Monitor terminal  
Cable color  
Cable color  
(for T568A)  
RJ45 pin No.  
(for T568B)  
Orange/white  
Orange  
RJ45 pin No.  
Green/white  
Green  
1
1
2
3
4
5
6
7
8
2
Green/white  
Blue  
Orange/white  
Blue  
3
4
Blue/white  
Green  
Blue/white  
Orange  
5
6
Brown/white  
Brown  
Brown/white  
Brown  
7
8
Shield  
Shield  
Shielded Category 5 twisted pair cable for LAN  
(CAT5-STP)  
17  
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16. SPECIFICATIONS  
16.1. DA-550F CE  
Power Source  
220 – 240 V AC, 50/60 Hz  
Amplification system  
Power Consumption  
Digital class D  
480 W (based on EN standards), 2750 W (rated output 4 Ω x 4),  
1550 W (rated output 8 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),  
XLR-3-31 type connector  
CH 1 mode ON/OFF switch (ON: CH 1 to All ch, OFF: Each ch)  
Rated Output  
4 channels: 550 W x 4 (4 Ω), 350 W x 4 (8 Ω)  
2 channels (BRIDGE): 1,100 W x 2 (8 Ω)  
M4 screw terminal, distance between barriers: 8.8 mm