Toa DA-1250D Operating Instructions Manual

DUAL POWER AMPLIFIER

OPERATING INSTRUCTIONS

DA-1250D

Table of contents

Important Safety Instruction and symbol description
F

oreword................................................................................................................................................................................2

Front panel functions

panel functions

Rear ........................................................................................................................................................4

System connection cases
Wiring and AC power supply
Thermal Dissipation

Power Level adjustment...................................................................................................................................................8

Specifications

Troubleshooting................................................................................................................................................................10

Thank you for purchasing TOA's Dual Power Amplifier.
Please carefully follow the instructions in this manual to ensure long, trouble-free use of your equipment.

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Important Safety Instruction and symbol description

1.Read these instructions.

2.Keep this operating instructions.

3.Pay attention to all the notice.

4.Comply with these instructions.

5.It is forbidden to spray liquid around the equipment. Please do not place liquid container above the
product, such as vases, etc.The dry cloth and air pressure gun can be used for cleaning.

6.Warning:Avoid the formation of hot air circulation. Installation as suggested way.

7.Do not install near heat, make sure the application temperature is °C.below 35

8. Ground protection measures should be taken when the equipment is connected to the power outlet.

9.Protect the wire from being trampled or extruded, especially the plug, socket and the connector of it.
Warning: As a circuit to cut off the device, the power plug or equipment coupler should be kept
available at any time.

10.Make sure the startup and turnoff procedure: Pre-amp - Amplifier (Power on) Power amplifier (off)

-Pre-amp.

11.Power supply voltage must be in accord with the requirement of the equipment before use it.

12.Signal distributor is advised to be used when the input signal paralleled with more than 3 amplifiers,
to ensure the input signal without distortion.

13.Don't connect the output interface of one channel to the input interface of another channel in the
power amplifier. Don't connect one power amplifier to another one by connecting their output in
series or parallel connection.

14.When equip the audio equipments, the power of the power amplifier should be 50%-100% more
than the loudspeaker power. Be careful when in bridged mode.

15.When maintenance, don't connect the probe of the oscilloscope to the output interface under
bridge mode in case of damaging the power amplifier and the oscilloscope.

16.Suggestions:

1) Good quality NL4 Speakers screw plug is advised.

2) Power distribution system should ensure the safety of applications of more than one amplifier.

The exclamation point triangle is
used to alert the user to important
operating or maintenance instructions.

The lightning bolt triangle is used to alert the
user to the risk of electric shock.
Non-professional qualified technicians do not
open TOP OR BOTTOM COVERS for maintenance

This equipment is only to use safely in the
region below the altitude of 2000 meters

This equipment is only to use safely in
the not tropical climate conditions

TO REDUCE THE RISK OF FIRE OR ELECTRIC
SHOCK, DO NOT EXPOSE THIS APPARATUS

WARNING

TO RAIN OR MOISTURE.

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Foreword

Welcome

Thank you for purchas our products.
The DA-1250D dual power amplifier is designed
for sound reinforcement, lectures and other
applications. sound

Please take the time to study this manual so that
you can obtain the best possible service from your
amplifier.

Unpacking

Please unpack and inspect your amplifier for any
damage that may have occurred during transit.
Confirm the preset voltage of the power amplifier
matches your local voltage rating ( Please refer to
the print on the rear panel for detailed information).
We also recommend that you save all packing
materials so you will have them when need to
return the power amplifier.

ing

Important safety precautions

Our products has already taken the safe
requirement in to consideration and all the
finished products have been tested under the
requirement of the government before sale.
Due to the inner dangerous high voltage and
electricity, we strongly recommend you read all
instructions, warnings and cautions contained in
this manual. It will increase the chance of getting
shock by the electricity if the product falls down,
recess in the appearance, soaked or there were
some parts loose internal. If there are problems
above, please turn off power immediately and
send the defective units to local distributor for
service.

Rated Power

Model

DA-1250D

8Ω 4Ω

700Wx2

8Ω BRIDGE

2500W1250Wx2

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Front panel functions

Front Panel

Suction

Control panel

PROTECT

CLIP

-5dB

-10dB

-20dB

SIGNAL

POWER

CH1-CH2

Mounting hole

Power switch

Illuminates when either protection
circuit action.
Illuminates when compressor / limiter is
protecting the amplifier from input overload.

Illuminates when output signal around -5dB
than full power.

Illuminates when output signal around -10dB
than full power.

Illuminates when output signal around -20dB
than full power.

The signal light

Illuminates when the amplifier start.

Gain Controller Knob

Stereo/Paralle Mode: volumes of CH1 and CH2
control independently.
Bridge Mode: CH1 knob controls both volumes.
Ch1 stops working.

For normal operation, please keep the
controller at max (0dB).

Cleaning guide of the dust filter

The first time cleaning of the strainer mesh
should be right after install at ion.
Recom me nd to clean the strainer mesh
quar terly.

Please do not run the product without the
dust filter, or it makes the service
life of the product shorten.

condition will be conside red as

Such
no warranty.

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