TOA Electronics DA-250FH CU, DA-250F CU User Manual

425.97 Kb

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.

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

2

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.

3

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

CAUTION

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

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.

CAUTION

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

4

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.

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.

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.

5

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.

6

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)

7

7. NOMENCLATURE AND FUNCTIONS

[Front]

3

4

5

2

1

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

1and 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.

Note: The figure shows the DA-250F.

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.

8

[Rear]

6

7

8

9

10

9

11

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.

Note: The figure is common to DA-250F and DA-250FH.

• 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)

9

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.

BRIDGE 2

 

BRIDGE 1

ON/OFF button

 

ON/OFF button

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CH 1 mode ON/OFF button

10 mm

Be sure to replace the unit's terminal cover after connection WARNING completion. Because high voltage is generated at the speaker output

terminals, never touch these terminals to avoid electric shock.

8.2. Button Settings and Speaker Connections

[4 inputs - 4 outputs]

Speaker output terminals

 

CH1 CH1

CH2 CH2

CH3 CH3

CH4

CH4

Button

Setting

BRIDGE 1

OFF

BRIDGE 2

OFF

 

 

CH 1 mode

OFF

 

 

CH4 CH3 CH2 CH1

-+ - + - + - +

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DA-250F

 

DA-250FH

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

 

4 – 8

 

19.6 Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

 

4 – 8

 

19.6 Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

 

4 – 8

 

19.6 Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

 

4 – 8

 

19.6 Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[1 input - 4 outputs]

 

 

Speaker output terminals

 

 

 

 

 

 

 

CH1

Button

Setting

CH4

CH3

CH2

CH1

 

 

- +

- +

- +

- +

 

 

CH1

BRIDGE 1

OFF

 

 

 

DA-250F

DA-250FH

CH2

 

 

 

BRIDGE 2

OFF

 

 

 

+

19.6 Ω

 

CH 1 mode

ON

 

 

 

4 – 8

CH3

 

 

 

 

 

 

 

 

 

 

+

19.6 Ω

 

 

 

 

 

 

4 – 8

 

 

 

 

 

 

 

 

CH4

 

 

 

 

 

+

19.6 Ω

 

 

 

 

 

 

4 – 8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

19.6 Ω

 

 

 

 

 

 

4 – 8

 

 

 

 

 

 

 

 

10

[2 inputs - 2 outputs]

CH1

CH1

CH2

CH3

CH3

CH4

[1 input - 2 outputs]

CH1

CH1

CH2

CH3

CH4

[3 inputs - 3 outputs (1)]

CH1

CH1

CH2

CH2

CH3

CH3

CH4

[3 inputs - 3 outputs (2)]

CH1

CH1

CH2

CH3

CH3

CH4

CH4

[1 input - 3 outputs (1)]

CH1

CH1

CH2

CH3

CH4

Button

Setting

BRIDGE 1

ON

 

 

BRIDGE 2

ON

 

 

CH 1 mode

OFF

 

 

Speaker output terminals

BRIDGE 2 -

+

-

+ BRIDGE 1

DA-250F DA-250FH

 

 

+

8 – 16 Ω

39.2 Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

8 – 16

39.2 Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

Button

Setting

 

 

BRIDGE 1

ON

 

 

BRIDGE 2

ON

 

 

CH 1 mode

ON

Speaker output terminals

BRIDGE 2 -

+

-

+ BRIDGE 1

DA-250F DA-250FH

 

+

8 – 16

39.2 Ω

 

 

 

 

 

 

 

 

 

+

8 – 16

39.2 Ω

 

 

 

Speaker output terminals

Button

Setting

BRIDGE 1

OFF

 

 

BRIDGE 2

ON

 

 

CH 1 mode

OFF

 

 

Button

Setting

BRIDGE 1

ON

 

 

BRIDGE 2

OFF

 

 

CH 1 mode

OFF

 

 

Button

Setting

BRIDGE 1

OFF

 

 

BRIDGE 2

ON

 

 

CH 1 mode

ON

 

 

CH2 CH1

-+ - +

 

 

DA-250F DA-250FH

BRIDGE 2 -

+

+

19.6 Ω

 

 

4 – 8

 

 

 

 

 

 

+

19.6 Ω

 

 

4 – 8

 

 

 

 

 

 

+

 

39.2 Ω

 

 

8 – 16 Ω

 

 

 

 

Speaker output terminals

CH4

CH3

-

+

-

+

-+ BRIDGE 1

 

 

 

 

 

 

DA-250F

 

DA-250FH

 

 

+

 

 

 

 

 

 

 

8 – 16 Ω

 

39.2 Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

 

4 – 8

 

19.6 Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

+

 

4 – 8

 

19.6 Ω

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Speaker output terminals

 

CH2

CH1

 

-

+

-

+

BRIDGE 2 -

+

 

 

+

 

 

 

 

 

 

 

 

+

 

 

 

 

 

 

 

 

+

 

 

 

 

DA-250F

 

DA-250FH

 

 

 

 

4

– 8 Ω

 

19.6 Ω

4

– 8 Ω

 

19.6 Ω

8

– 16 Ω

 

39.2 Ω

11

[1 input - 3 outputs (2)]

CH1 CH1

CH2

CH3

CH4

Button

Setting

BRIDGE 1

ON

 

 

BRIDGE 2

OFF

 

 

CH 1 mode

ON

 

 

Speaker output terminals

 

 

CH4

CH3

 

 

 

- +

- +

 

 

 

 

-

+ BRIDGE 1

 

 

 

 

DA-250F

DA-250FH

 

 

+

 

39.2 Ω

 

 

8 – 16 Ω

 

 

 

 

 

 

+

19.6 Ω

 

 

4 – 8

 

 

 

 

 

 

+

19.6 Ω

 

 

4 – 8

 

 

 

 

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

2

 

 

1

cable.

Tightens

Loosens

 

 

Step 2. Retighten the terminal screw. (Pull on the cable to ensure it is securely connected.)

Terminal screw

Hot 1

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

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]

 

 

 

 

ON/OFF

 

 

Jumper socket

 

 

 

 

PassHi Filter

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[When set to OFF]

Jumper socket

ON/OFF

Hi Pass Filter

(Factory-preset)

(Viewed from top with the top cover detached.)

Input sensitivity setting

[When set to +4 dB]

Jumper socket

 

 

 

dBdB/+4

Sensitivity

 

 

 

 

 

 

 

 

 

 

 

 

-10

Input

 

 

 

 

(Factory-preset)

[When set to –10 dB]

Jumper socket

 

 

 

dB/+4dB

Sensitivity

 

 

 

-10

Input

 

 

 

 

 

 

 

 

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

11. PROTECTION OPERATION LIST

Failure

Protection

Operation Indicator

Remedy

Recovery

 

 

 

 

 

Overcurrent due

Current limiter activated

Peak indicator lights.

Remove overload.

Connecting a correct load

to overload

when impedance drops

 

 

automatically restores

 

below the specified

 

 

normal operation.

 

value.

 

 

 

 

 

 

 

 

Short circuit

Current limiter activated.

Protection indicator

Check speakers and

Turn off the power switch.

 

Load is disconnected.

lights.

lines for short circuit.

Correct the load, then

 

 

 

 

switch on the power.

 

 

 

 

 

Rise in heat sink

Load disconnected.

Protection indicator

Check the unit for

Operation automatically

temperature

 

lights.

correct ventilation and

returns to normal when

(over 110°C)

 

 

overload.

the temperature decreases.

 

 

 

 

 

Temperature rise

Built-in amplifier unit

Four indicators of

 

 

inside the unit

that caused the failure

the corresponding

 

 

(over 80°C)

halted.

channel extinguish.

 

 

 

 

 

 

 

Abnormal DC

Load disconnected.

Protection indicator

Contact the TOA dealer where the unit was

voltage output

 

lights.

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

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

16

CH 1 INPUT

H

C

E

CH 2 INPUT

H

C

E

CH 3 INPUT

H

C

E

CH 4 INPUT

H

C

E

CH 1 to all switch

CH 1 volume control

CH 2 volume control

CH 3 volume control

CH 4 volume control

 

 

OUTPUT 1

 

 

relay

 

 

Current Limitter

+4 dB

 

Short Detector

-10 dB

 

Protection Circuit

 

 

CH 1 sensitivity

 

OUTPUT 2

selection jumper

ON

(+4 dB/-10 dB)

relay

 

OFF

Current Limitter

 

 

+4 dB

BRIDGE 1 ON/OFF switch

Short Detector

 

 

-10 dB

 

Protection Circuit

 

 

CH 2 sensitivity

 

OUTPUT 3

selection jumper

 

(+4 dB/-10 dB)

 

relay

 

 

Current Limitter

+4 dB

 

Short Detector

-10 dB

 

Protection Circuit

CH 3 sensitivity

 

OUTPUT 4

selection jumper

ON

(+4 dB/-10 dB)

relay

 

OFF

Current Limitter

 

 

+4 dB

BRIDGE 2 ON/OFF switch

Short Detector

 

 

-10 dB

 

Protection Circuit

 

 

CH 4 sensitivity

 

 

selection jumper

 

 

(+4 dB/-10 dB)

 

 

CH 1

OUTPUT

+

-

BRIDGE 1

OUTPUT

+

-

CH 2

OUTPUT

CH 3

OUTPUT

+

-

BRIDGE 2

OUTPUT

+

-

CH 4

OUTPUT

250F-DA .1.14

DIAGRAMS BLOCK .14

CH 1 INPUT

H

C

E

CH 2 INPUT

H

C

E

CH 3 INPUT

H

C

E

CH 4 INPUT

H

C

E

CH 1 to all switch

CH 1 volume control

CH 2 volume control

CH 3 volume control

CH 4 volume control

+4 dB

-10 dB

CH 1 sensitivity selection jumper (+4 dB/-10 dB)

ON

HPF

50 Hz

CH 1 HPF ON/OFF jumper

 

OFF

HPF

 

50 Hz

 

BRIDGE 1 ON/OFF

+4 dB

 

switch

CH 2 HPF

-10 dB

 

ON/OFF jumper

CH 2 sensitivity

 

 

selection jumper

 

 

(+4 dB/-10 dB)

 

 

+4 dB

-10 dB

CH 3 sensitivity selection jumper (+4 dB/-10 dB)

ON

HPF

50 Hz

CH 3 HPF ON/OFF jumper

 

OFF

HPF

 

BRIDGE 2 ON/OFF

50 Hz

+4 dB

 

switch

CH 4 HPF

 

-10 dB

 

 

ON/OFF jumper

CH 4 sensitivity

 

 

selection jumper

 

 

(+4 dB/-10 dB)

 

 

OUTPUT 1 relay

OFF

 

ON

Current Limitter

 

Short Detector

Protection Circuit

OUTPUT 2 relay

OFF

ON

Current Limitter

Short Detector

Protection Circuit

OUTPUT 3 relay

OFF

ON

Current Limitter

Short Detector

Protection Circuit

OUTPUT 4 relay

OFF

ON

Current Limitter

Short Detector

Protection Circuit

CH 1

OUTPUT

+

-

BRIDGE 1

OUTPUT

+

-

CH 2

OUTPUT

CH 3

OUTPUT

+

-

BRIDGE 2

OUTPUT

+

-

CH 4

OUTPUT

250FH-DA .2.14

17

15. DIMENSIONAL DIAGRAM

Unit: mm

20

374

400

31.8

 

44

 

 

465

482

18

16. SPECIFICATIONS

Model

DA-250F CU

 

DA-250FH CU

 

 

 

Power Source

120 V AC, 50/60 Hz

 

 

 

Power Consumption

200 W (at 1/8 rated output x 4 channels)

 

 

 

 

Output

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)

 

 

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)

 

 

 

 

Total Harmonic

0.15% (1 kHz)

 

0.15% (1 kHz)

Distortion

0.3% (20 Hz – 20 kHz)

 

0.3% (100 Hz – 20 kHz) (HPF ON)

 

 

 

0.3% (20 Hz – 20 kHz) (HPF OFF)

 

 

 

Input Sensitivity

+4 dB* (1.23 V) / –10 dB* (0.24 V) (selectable with the inner jumper)

 

 

 

Input Impedance

10 kΩ (electronically-balanced)

S/N Ratio

 

100 dB

 

 

 

Connection

Input (CH 1 – 4): Removable terminal block

Terminal

Output:

M4 screw terminal

 

Power input:

AC inlet

 

 

 

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)

 

 

 

Operating Temperature

–10 to +40°C

 

 

 

Humidity

90 % or less (no dew condensation must be formed.)

 

 

 

Finish

Front panel: Aluminum, alumite process, black

 

 

 

Dimensions

482. (w) x 44 (h) x 400 (d) mm

 

 

 

 

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

Printed in Japan 133-22-027-00