OPERATING INSTRUCTIONS
MULTICHANNEL 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.
2
TABLE OF CONTENTS
1. IMPORTANT SAFETY INSTRUCTIONS .................................................... 3
2. SAFETY PRECAUTIONS ............................................................................... 4
3. GENERAL DESCRIPTION ............................................................................. 6
4. FEATURES .......................................................................................................... 6
5. HANDLING PRECAUTIONS .......................................................................... 6
6. INSTALLATION PRECAUTIONS ................................................................. 7
7. NOMENCLATURE AND FUNCTIONS
Front ......................................................................................................................... 8
Rear .......................................................................................................................... 9
8. CONNECTIONS
8.1. Procedure ......................................................................................................... 10
8.2. Button Settings and Speaker Connections ...................................................... 10
9. REMOVABLE TERMINAL PLUG CONNECTION .................................. 12
10. INPUT SENSITIVITY AND
HIGH-PASS FILTER ON/OFF SETTINGS
................................................ 13
11. PROTECTION OPERATION LIST ............................................................... 14
12. VOLUME CONTROL CAP ATTACHMENT .............................................. 14
13. CLEANING THE FILTER ................................................................................ 15
14. BLOCK DIAGRAMS
14.1. DA-250F ........................................................................................................... 16
14.2. DA-250FH ........................................................................................................ 17
15. DIMENSIONAL DIAGRAM ............................................................................ 18
16. SPECIFICATIONS ............................................................................................ 19
Accessories ............................................................................................................. 19
3
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.
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.
FCC REQUIREMENTS
• 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.
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, 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.
• Be sure to replace the unit's terminal cover after
connection completion. Because the voltage of up
to 140 V is applied to the high impedance speaker
terminals, never touch these terminals to avoid
electric shock.
• External wiring connected to the terminals marked
with requires installation by an instructed person.
• The apparatus shall be connected to a mains
socket outlet with a protective earthing connection.
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.)
· If it is malfunctioning (no tone sounds.)
• To prevent a fire or electric shock, never open nor
remove the unit case as there are high voltage
components inside the unit. Refer all servicing such
as modification inside the unit to qualified service
personnel.
• 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.
• 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 touch a plug during thunder and lightning,
as this may result in electric shock.
When Installing the Unit
• Never plug in nor remove the power supply plug
with wet hands, as doing so may cause 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
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.
WARNING
Indicates a potentially hazardous situation which, if mishandled, could
result in death or serious personal injury.
Indicates a potentially hazardous situation which, if mishandled, could
result in moderate or minor personal injury, and/or property damage.
WARNING
CAUTION
CAUTION
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.
Doing so may cause heat to build up inside the unit
and result in fire.
• 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.
• The DA-250F and DA-250FH are designed
exclusively to be mounted in an equipment rack.
Be sure to follow the instructions below when rackmounting the unit. Failure to do so may cause a fire
or personal injury.
· 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.
· When connecting the unit's power cord to an AC
outlet, use the AC outlet with current capacity
allowable to the unit.
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.
• 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.
• 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.
• 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.
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.
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.
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'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, 39.2 Ω for DA-250FH) x 2 channels or a 3-channel amplifier of 500 W (8
Ω) + 250 W (4 Ω) x 2 channels for DA-250F, 500 W (39.2 Ω) + 250 W (19.6 Ω) 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.
7
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.
• 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)
Power amplifiers
DA-250F/250FH
Power amplifiers
DA-250F/250FH
Perforated panel
8
7. NOMENCLATURE 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
• When Channels 1 and 2 are bridgeconnected (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 bridgeconnected (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.
4. Ventilation panel (Air Vent)
A filter is located inside the ventilation panel.
To clean the filter, remove the ventilation panel.
(See p. 15; Cleaning the Filter.)
5. Indicators [INPUT, OUTPUT, PEAK, PROTECT]
The indicators are as follows from left to right:
• Input indicator [INPUT]
Lights green regardless of the input volume
control setting when an input signal level exceeds
about –20 dB.
• Output indicator [OUTPUT]
Lights yellow when an output level exceeds about
1W at an 8 Ω load (DA-250F) or 19.6 Ω load (DA250FH).
• 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.
1243 5
Note: The figure shows the DA-250F.
9
[Rear]
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 reduce the hum
noise.
Note
This terminal is not for protective ground.
8. Speaker output terminals (with a terminal
cover)
Connect speaker cables to these terminals.
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:
• 4-channel input mode
Set both BRIDGE 1 and 2 buttons to OFF.
• 3-channel input mode
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.
• 2-channel input mode
Set both BRIDGE1 and 2 to ON.
Note
Be sure to first turn off the power switch when
changing the BRIDGE button settings.
10. CH1 mode ON/OFF button [CH 1 TO ALL,
ON/ OFF]
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).
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)
6 7 8
9 910
11
Note: The figure is common to DA-250F and DA-250FH.
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 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.
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
BRIDGE 2
ON/OFF button
10 mm
BRIDGE 1
ON/OFF button
CH 1 mode ON/OFF button
[4 inputs - 4 outputs]
CH1
CH1
CH2
CH2
CH3
CH3
CH4
CH4
[1 input - 4 outputs]
CH1
CH1
CH2
CH3
CH4
Button
BRIDGE 1
BRIDGE 2
CH 1 mode
Button
BRIDGE 1
BRIDGE 2
CH 1 mode
Setting
OFF
OFF
OFF
Setting
OFF
OFF
ON
Speaker output terminals
Speaker output terminals
CH4
-
CH4
-
CH3
CH2
+
-
+
CH1
-
+
-
+
DA-250F DA-250FH
+
4 – 8 Ω
–
19.6 Ω
+
4 – 8 Ω
–
19.6 Ω
+
4 – 8 Ω
–
19.6 Ω
+
4 – 8 Ω
–
CH3
CH2
+
-
+
CH1
-
+
-
+
19.6 Ω
DA-250F DA-250FH
+
4 – 8 Ω
–
19.6 Ω
+
4 – 8 Ω
–
19.6 Ω
+
4 – 8 Ω
–
19.6 Ω
+
4 – 8 Ω
–
19.6 Ω
11
[2 inputs - 2 outputs]
CH1
CH1
CH2
CH3
CH3
CH4
[1 input - 2 outputs]
CH1
CH1
CH2
CH3
CH4
Button
BRIDGE 1
BRIDGE 2
CH 1 mode
Button
BRIDGE 1
BRIDGE 2
CH 1 mode
Setting
ON
ON
OFF
Setting
ON
ON
ON
Speaker output terminals
-
-
+
+
Speaker output terminals
-
-
+
+
BRIDGE 1BRIDGE 2
DA-250F DA-250FH
+
8 – 16 Ω
–
+
8 – 16 Ω
–
BRIDGE 1BRIDGE 2
DA-250F DA-250FH
+
8 – 16 Ω
–
+
8 – 16 Ω
–
39.2 Ω
39.2 Ω
39.2 Ω
39.2 Ω
[3 inputs - 3 outputs (1)]
CH1
CH1
CH2
CH2
CH3
CH3
CH4
[3 inputs - 3 outputs (2)]
CH1
CH1
CH2
CH3
CH3
CH4
CH4
Button
BRIDGE 1
BRIDGE 2
CH 1 mode
Button
BRIDGE 1
BRIDGE 2
CH 1 mode
Setting
OFF
ON
OFF
Setting
ON
OFF
OFF
Speaker output terminals
CH2
-
-
BRIDGE 2
+
Speaker output terminals
CH3
CH4
-
-
+
+
CH1
-
+
+
DA-250F DA-250FH
+
4 – 8 Ω
–
+
4 – 8 Ω
–
+
8 – 16 Ω
–
-
+
BRIDGE 1
19.6 Ω
19.6 Ω
39.2 Ω
DA-250F DA-250FH
+
–
8 – 16 Ω
39.2 Ω
+
4 – 8 Ω
–
19.6 Ω
+
4 – 8 Ω
–
19.6 Ω
[1 input - 3 outputs (1)]
CH1
CH1
CH2
CH3
CH4
Button
BRIDGE 1
BRIDGE 2
CH 1 mode
Setting
OFF
ON
ON
Speaker output terminals
CH2
-
+
-
BRIDGE 2
+
CH1
-
+
DA-250F DA-250FH
+
4 – 8 Ω
–
19.6 Ω
+
4 – 8 Ω
–
19.6 Ω
+
–
8 – 16 Ω
39.2 Ω
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
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
[1 input - 3 outputs (2)]
CH1
CH1
CH2
CH3
CH4
Button
BRIDGE 1
BRIDGE 2
CH 1 mode
Setting
ON
OFF
ON
Speaker output terminals
CH3
CH4
-
-
+
+
-
+
BRIDGE 1
DA-250F DA-250FH
+
8 – 16 Ω
–
+
4 – 8 Ω
–
+
4 – 8 Ω
–
39.2 Ω
19.6 Ω
19.6 Ω
Shielded cable
7 mm
20 mm
2
Tightens
Hot
1
Cold
Earth
Slotted screwdriver
Loosens
1
Terminal screw
Removable terminal plug
Shielded cable
Bit shape 3 mm
13
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."
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.
CAUTION
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.
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.
High-pass filter setting (DA-250FH only)
[When set to ON] [When set to OFF]
Jumper socket
[When set to +4 dB]
Jumper socket
ON/OFF
(Factory-preset)
Input sensitivity setting
Jumper socket
Hi Pass
Filter
Jumper socket
ON/OFF
DA-250F/250FH
(Viewed from top with the
top cover detached.)
Front panel
[When set to –10 dB]
Hi Pass
Filter
10 dB/+4 dB
-
(Factory-preset)
Input Sensitivity
10 dB/+4 dB
-
Input Sensitivity
14
11. PROTECTION OPERATION LIST
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.
Failure Protection Operation Indicator Remedy Recovery
Overcurrent due
to overload
Short circuit Current limiter activated.
Rise in heat sink
temperature
(over 110°C)
Temperature rise
inside the unit
(over 80°C)
Abnormal DC
voltage output
Current limiter activated
when impedance drops
below the specified
value.
Load is disconnected.
Load disconnected. Protection indicator
Built-in amplifier unit
that caused the failure
halted.
Load disconnected. Protection indicator
Peak indicator lights. Remove overload. Connecting a correct load
automatically restores
normal operation.
Protection indicator
lights.
lights.
Four indicators of
the corresponding
channel extinguish.
lights.
Check speakers and
lines for short circuit.
Check the unit for
correct ventilation and
overload.
Contact the TOA dealer where the unit was
purchased.
Turn off the power switch.
Correct the load, then
switch on the power.
Operation automatically
returns to normal when
the temperature decreases.
Input volume control
Volume control cap (supplied)
15
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
16
14. BLOCK DIAGRAMS
14.1. DA-250F
BRIDGE 1
OUTPUT
+
CH 1
OUTPUT
-
BRIDGE 2
OUTPUT
-
+
CH 2
OUTPUT
CH 3
OUTPUT
+
-
-
+
CH 4
OUTPUT
relay
OUTPUT 1
Short Detector
Current Limitter
Protection Circuit
10 dB
-
+4 dB
relay
OUTPUT 2
ON
10 dB)
-
relay
OUTPUT 3
Short Detector
Current Limitter
Protection Circuit
OFF
BRIDGE 1 ON/OFF switch
10 dB
+4 dB
-
10 dB)
-
Short Detector
Current Limitter
Protection Circuit
10 dB
-
+4 dB
relay
OUTPUT 4
ON
10 dB)
-
Short Detector
Current Limitter
Protection Circuit
OFF
BRIDGE 2 ON/OFF switch
10 dB
+4 dB
-
10 dB)
-
CH 1 INPUT
E
H
C
CH 1
volume
control
CH 1 sensitivity
selection jumper
(+4 dB/
CH 2 INPUT
E
H
C
CH 2
volume
control
CH 2 sensitivity
selection jumper
(+4 dB/
CH 3 INPUT
E
H
C
CH 3
volume
control
CH 3 sensitivity
selection jumper
(+4 dB/
CH 4 INPUT
E
H
C
CH 4
volume
control
CH 1 to all
switch
CH 4 sensitivity
selection jumper
(+4 dB/
17
14.2. DA-250FH
+
CH 1
OUTPUT
BRIDGE 1
OUTPUT
-
-
+
CH 2
OUTPUT
CH 3
OUTPUT
+
-
BRIDGE 2
OUTPUT
-
+
CH 4
OUTPUT
relay
OUTPUT 1
OFF
Short Detector
Current Limitter
ON
HPF
Protection Circuit
50 Hz
CH 1 HPF
ON/OFF jumper
relay
OUTPUT 2
OFF
ON
Short Detector
Current Limitter
ON
HPF
OFF
Protection Circuit
50 Hz
CH 2 HPF
ON/OFF jumper
BRIDGE 1 ON/OFF
switch
relay
OUTPUT 3
OFF
Short Detector
Current Limitter
ON
HPF
50 Hz
CH 3 HPF
ON/OFF jumper
Protection Circuit
relay
OUTPUT 4
OFF
ON
Short Detector
Current Limitter
ON
HPF
OFF
Protection Circuit
50 Hz
CH 4 HPF
ON/OFF jumper
BRIDGE 2 ON/OFF
switch
CH 1 INPUT
E
H
C
+4 dB
CH 1
10 dB
-
volume
10 dB)
-
CH 1 sensitivity
selection jumper
(+4 dB/
control
CH 2 INPUT
H
C
10 dB
+4 dB
-
10 dB)
-
CH 2 sensitivity
selection jumper
(+4 dB/
CH 2
volume
control
E
CH 3 INPUT
E
H
C
+4 dB
CH 3
volume
10 dB
-
10 dB)
-
CH 3 sensitivity
selection jumper
(+4 dB/
control
CH 4 INPUT
H
C
E
10 dB
+4 dB
-
CH 4
volume
control
CH 1 to all
switch
10 dB)
-
CH 4 sensitivity
selection jumper
(+4 dB/
18
15. DIMENSIONAL DIAGRAM
Unit: mm
20
374
400
465
482
31.8
44
19
16. SPECIFICATIONS
* 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
DA-250F CU DA-250FH CU
120 V AC, 50/60 Hz
200 W (at 1/8 rated output x 4 channels)
4 channels: 250 W x 4 (4 Ω), 4 channels: 250 W x 4 (19.6 Ω)
170 W x 4 (8 Ω) 2 channels (bridge connection):
2 channels (bridge connection): 500 W x 2 (39.2 Ω)
500 W x 2 (8 Ω)
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) 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)
+4 dB* (1.23 V) / –10 dB* (0.24 V) (selectable with the inner jumper)
10 kΩ (
electronically-balanced
)
100 dB
Input (CH 1 – 4): Removable terminal block
Output: M4 screw terminal
Power input: AC inlet
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
90 % or less (no dew condensation must be formed.)
Front panel: Aluminum, alumite process, black
482. (w) x 44 (h) x 400 (d) mm
6.6 kg
Model
Power Source
Power Consumption
Output
Frequency Response
Total Harmonic
Distortion
Input Sensitivity
Input Impedance
S/N Ratio
Connection
Terminal
Indicator
Operating Temperature
Humidity
Finish
Dimensions
Weight
Printed in Japan
133-22-027-00
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