DA550F - Receiver TOA - Free user manual and instructions

Product Type	Professional Audio Power Amplifier Receiver
Brand	TOA
Model	DA550F
Power Supply	Mains 100-240 V AC, 50/60 Hz
Output Power	550 W RMS at 4 Ω (stereo)
Load Impedance	4 Ω (minimum per channel)
Dimensions (W × H × D)	482 × 88 × 300 mm (19" rack, 2U)
Weight	10 kg
Main Features	Switchable high-pass filter (HPF), overload, short-circuit and temperature protection, balanced and unbalanced inputs, screw-type speaker terminals
Maintenance and Cleaning	Clean with a dry cloth; clean the dust filter regularly
Safety	Grounding mandatory; do not expose to water; use only specified voltage
Supplied Accessories	Instruction manual, power cable
Operating Temperature	0 °C to 40 °C
Connectivity	XLR and 6.35 mm jack inputs; speaker outputs on screw terminal block; control/monitor RJ45

Frequently Asked Questions - DA550F TOA

How to connect high-impedance speakers to the DA550F?

The DA-500F-HL model supports high-impedance speakers (up to 140 V). For the standard DA550F, use low-impedance speakers (4 Ω minimum). Refer to the SETTINGS AND CONNECTIONS section for wiring.

How to adjust the input sensitivity?

The input sensitivity is adjusted via a potentiometer on the rear panel. Use a screwdriver to adjust between -6 dB and +6 dB. Refer to the INPUT SENSITIVITY SETTING section.

What does the Peak indicator mean?

The Peak indicator indicates an excessive input signal. If the HPF filter is OFF, prolonged use with this indicator lit may damage the speakers. Enable the high-pass filter (HPF) to prevent risks.

How to clean the dust filter?

Unplug the device. Remove the filter located on the front panel (see CLEANING THE FILTER). Clean it with a vacuum cleaner or soapy water, then dry it completely before reinstalling.

What are the essential safety precautions?

Do not open the cabinet (dangerous voltage). Use a grounded outlet. Do not expose to water or moisture. If smoke appears, unplug immediately. Observe the WARNING and CAUTION symbols in the manual.

How to use the control/monitor terminals?

The CONTROL/MONITOR terminals (RJ45) allow connection of remote control devices. Refer to the HOW TO USE THE CONTROL/MONITOR TERMINALS section for pin assignments and maximum cable lengths.

How to install the device in a rack?

Use screws with minimum diameter 5 mm and minimum length 12 mm. Secure the rack to the floor to prevent tipping. Leave ventilation space. Follow the INSTALLATION PRECAUTIONS instructions.

What to do in case of overheating?

If the device shuts down due to overheating, let it cool down. Check that ventilation openings are not blocked. Reduce the volume or input signal. The thermal protection will reset automatically.

How to connect the power supply?

Use the supplied power cable. Plug it into a grounded mains outlet. Ensure the voltage matches that indicated on the device (100-240 V AC). Do not use an unsuitable extension cord.

What cables to use for audio connections?

For inputs, use balanced cables (XLR or TRS jack) to reduce noise. For speakers, use cables of suitable gauge (2.5 mm² minimum for 550 W). Refer to the REMOVABLE TERMINAL PLUG CONNECTION section.

USER MANUAL DA550F TOA

An all-pole mains switch with a contact separation of at least 3mm (0.12") in each pole shall be incorporated in the electrical installation of the building.

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.

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.

INSTRUCTIONS ESSENTIELLES POUR LA SÉCURITÉ

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 apparéil numérique de la classe A est conforme à la norme NMB-003 du Canada.

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.

CAUTION

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 140V is applied to the high impedance speaker terminals, never touch these terminals to avoid electric shock. (DA-500F-HL only)
• External wiring connected to the terminals marked with requires installation by an instructed person. (DA-500F-HL only)
• 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 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.
• 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 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.

• 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 5mm (0.2^ ) and length of over 12mm (0.47^ ) 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

• With the HPF ON/OFF switch kept to the OFF position (factory preset), operating the unit for long periods of time while the Peak indicator is illuminated due to excessive input signal may damage the connected speakers, possibly resulting in fire. Operating the unit with the HPF ON/OFF switch set to the ON position may decrease the possibility of speaker damage or fire due to excessive input signal.
• Make sure to set all input level controls to (infinity) position before power is switched on.

Loud noise produced when power is switched on with any of those controls set to the position other than position can impair hearing.

• Do not operate the unit for an extended period of time with the sound distorting. Doing so may cause the connected speakers to heat, resulting 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.
• Turn off this unit's power switch, 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.

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.

CONSEILS DE SECURITÉ

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. TOA's DA-500F-HL Multichannel Power Amplifier features high power handling of 500 W (70 V line) x 4 channels (9.8 Ω output), or 550 W x 4 channels (8 Ω output), or 100 W x 4 channels (4 Ω output) and durability.

Channels 1 and 2, and 3 and 4 are made available for bridge connection individually, allowing the DA-550F to be used as a 1,100 W (8 Ω) X 2 channels amplifier, or the DA-500F-HL as a 1,000 W (140 V line) x 2 channels (19.6 Ω) amplifier or 1,100 W x 2 channels (16 Ω) amplifier. When a bridge connection is made, each model can be used as a 2-channel stereo amplifier or as a 3-channel amplifier.

Their wide range of applications include stores and permanent sound systems.

4. 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.
• Equipped with the LED indicators that show the input/output status, etc.
• Built-in protection circuitry disconnects the power amplifier's output from the load 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 or 1.75" (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 2 or more channels in parallel.
• Only connect speakers with an impedance equal to or greater than those specified. Connecting speakers with a smaller impedance than specified 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^ (14°F and 104°F) and the moisture is less than 90%RH (no dew condensation must be formed).
• To clean, be sure to first turn off this unit's power switch, 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.
• The fan is a consumable product. As a guideline, we recommend that it be replaced with a new one when its total operating time reaches approximately 50000 hours (when used in ambient temperatures of approximately 25^ or 77^ ).

Note: The above figure is simply a guideline, and does not guarantee the fan's operating life. Since broadcasts from the digital power amplifier could be disabled if the fan malfunctions, the fan requires regular inspection and maintenance. For maintenance service, please contact the dealer from whom the digital amplifier was purchased.

6. INSTALLATION PRECAUTIONS

CAUTION

Rack mounting screws are not supplied with the unit.
Be sure to use the screws with a diameter of over 5mm (0.2^ ) and length of over 12mm (0.47^ ) to mount the unit.
Failure to do so may cause personal injury.

• 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.

• 1U size = 44.5 mm or 1.75" (reference size)

7. NOMENCLATURE AND FUNCTIONS

[Front]

1. Power switch [ON/OFF]

Turning this switch on causes the amplifier to function, and turning it off causes the amplifier to cease function.

Note: The unit is not completely disconnected from the power supply even if this Power switch is turned off.

2. Power indicator [POWER]

Lights blue when the Power switch (1) is turned on.

3. Input level controls

[CH 1/BRIDGE 1, CH 2, CH 3/BRIDGE 2, CH 4]

Adjust the input level of each channel.

Turn the control clockwise to increase the input level and counterclockwise to decrease the level.

When a bridge connection is made

• 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.

• 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.

4. Ventilation panel (Air Vent)

A filter is located inside the ventilation panel. To clean the filter, remove the ventilation panel. (See p. 18; 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 level control setting when an input signal level exceeds about -20dB

Output indicator [OUTPUT]

Lights yellow when an output level exceeds about 1 W at an 8 load (DA-550F) or 9.8 load (DA-500F-HL).

Peak indicator [PEAK]

Lights red when an output signal clips (distortion occurs).

Note

When the Peak indicator lights, turn the input level control (3) counterclockwise until its light extinguishes or decrease the input signal level of the connected external device.

Operating the unit while the Peak indicator remains lit may cause the protection circuitry to be activated.

- Protection indicator [PROTECT]

Lights red when the protection circuitry is activated. (See p. 17; Protection Operation List.) When the power is switched on, this indicator lights for about 2 seconds and then extinguishes.

[Rear]

6. AC power cord (2 m or 6.56 ft)

The socket-outlet shall be installed near the equipment and the plug (disconnecting device) shall be easily accessible.

Connecting external equipment to these terminals makes the control and monitor functions available for channels 1-4 individually.

(See p.20; How to Use the Control/Monitor Terminals.)

8. Speaker output terminals [OUTPUTS] (with a terminal cover)

Connect speaker cables to these terminals.

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.

• 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

Caution when using an XLR type plug

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.

10. BRIDGE ON/OFF switches

[BRIDGE 1, BRIDGE 2, ON/OFF]

Used when bridge-connecting the unit's Channels 1 and 2, and Channels 3 and 4. (See p. 13; Settings and Connections.)

• 4-channel output mode

Set both BRIDGE 1 and 2 switches to OFF. (factory-preset)

3-channel output 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.

• 2-channel output mode

Set both BRIDGE 1 and 2 switches to ON.

Note

Be sure to first turn off the Power switch (1) when changing these switch settings.

11. CH 1 mode ON/OFF switch

[CH1TOALL,ON/OFB]

Setting this switch to ON transmits the Channel 1 input signal to all channels. (CH1 to All ch mode) Note that output signal levels can be individually adjusted with each channel's Input level control (3).

Setting this switch to OFF (factory-preset) transmits each channel's input signal to each corresponding channel. (Each ch mode)

Note

Be sure to first turn off the Power switch (1) when changing this switch setting.

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.

Note

This terminal is not for protective ground.

13. HPF ON/OFF switch (DA-500F-HL only)

Input signals to CH1 - CH4 can be filtered through the High-pass filters having 6 dB attenuation at a cut-off frequency of 50Hz

Set the DIP switch to the "ON" position to switch on the filter, and set it to the "OFF" position to off the filter.

Note

The DIP switch is factory-preset to the "OFF" position.

When a bridge connection is made

Perform high-pass filter setting with the CH1 DIP switch when Channels 1 and 2 are bridge-connected (Set the Bridge 1 ON/OFF switch (10) to ON). (Filter setting for the CH2 is disabled.)

Similarly, perform the filter setting with the CH3 DIP switch when Channels 3 and 4 are bridge-connected. (Set the Bridge 2 ON/OFF switch (10) ON). (Filter setting for the CH4 is disabled.)

8. SETTINGS AND CONNECTIONS

Step 1. Turn off this unit's Power switch.

Step 2. Set the BRIDGE ON/OFF switches and CH 1 mode ON/OFF switch.

Step 3. Set the HPF ON/OFF switch. (DA-500F-HL only)

ON position: HPF ON (-6 dB/occt, cut off frequency 50 Hz)

OFF position: HPF OFF

CAUTION

With the HPF ON/OFF switch kept to the OFF position (factory preset), operating the unit for long periods of time while the Peak indicator is illuminated due to excessive input signal may damage the connected speakers, possibly resulting in fire.

Operating the unit with the HPF ON/OFF switch set to the ON position may decrease the possibility of speaker damage or fire due to excessive input signal.

Step 4. Connect the sound source equipment to the Input terminals.

Note: Refer to p. 16 for the removable terminal plug connection.

Step 5. Connect speakers to the Speaker output terminals.

5-1. Unscrew the output terminal cover.
5-2. Strip 10mm (0.39^ ) of insulative jacket from the end of the speaker cable, as shown in the figure at right.
5-3. Connect speaker cables to the output terminals.
5-4. Replace the output terminal cover in place.

WARNING

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-500F-HL only)

8.1. Switch Settings and Speaker Connections

[4 inputs - 4 outputs] (factory-preset)

Switch	Setting
BRIDGE 1	OFF
BRIDGE 2	OFF
CH 1 mode	OFF

Speaker output terminals

[1 input - 4 outputs]

Switch	Setting
BRIDGE 1	OFF
BRIDGE 2	OFF
CH 1 mode	ON

Speaker output terminals

[2 inputs - 2 outputs]

Switch	Setting
BRIDGE 1	ON
BRIDGE 2	ON
CH 1 mode	OFF

Speaker output terminals

[1 input - 2 outputs]

Switch	Setting
BRIDGE 1	ON
BRIDGE 2	ON
CH 1 mode	ON

Speaker output terminals

[3 inputs - 3 outputs (1)]

Speaker output terminals

[3 inputs - 3 outputs (2)]

Speaker output terminals

[1 input - 3 outputs (1)]

Speaker output terminals

[1 input - 3 outputs (2)]

Speaker output terminals

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

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 3mm (0.12") in width

10. 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. Remove this unit's power plug from an AC outlet.
Step 2. Unscrew 9 screws securing the top cover of the unit, then detach it.
Step 3. Insert the jumper socket into either "+" dB" or "-10 dB" position as shown at right.

When a bridge connection is made;

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.)

Step 4. Replace the detached top cover.

[When set to +4 dB] [When set to -10 dB]
(Factory-preset)

CH1CH2CH3CH4

Front panel

Viewed from top with the top cover detached.

11. PROTECTION OPERATION LIST

Failure Protection	Operation Indicator Remedy Recovery
Overcurrent due to overload	Current limiter activated when impedance drops below the specified value.	Peak indicator lights.	Remove overload.	Connecting a correct load automatically restores normal operation.
Short circuit Current	lmiter activated.Load is disconnected.	Protection indicator lights.	Check speakers and lines for short circuit.	Turn off this unit's Power switch. Correct the load, then turn on the power.
Temperature rise at power amp.heat sink(over 100°C or 212°F)	Load disconnected. Protection indicator lights.		Check the unit for correct ventilation and overload.	Operation automatically returns to normal when the temperature decreases.
Temperature rise at power supply heat sink(over 80°C or 176°F)	Built-in amplifier unit that caused the failure halted.	Four indicators of the corresponding channel extinguish.
Abnormal DC voltage output	Load disconnected. Protection indicator lights.		Contact the TOA dealer where the unit was purchased.

12. 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.

13. CLEANING THE FILTER

Step 1. Turn off this unit's Power switch.

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.

14. DIMENSIONAL DIAGRAM

Unit: mm (inches)

15. BLOCK DIAGRAMS

15.1.DA-550F

15.2.DA-500F-HL

16. 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.

Note

All terminals are electrically isolated from the unit body with the photocouplers.

16.1. 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.

Control voltage (Vin)	Power ON/OFF status on each channel
0 - 3 V DC ON
9 - 14 V DC OFF

When controlling the control terminal with a power supply of 14V 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)	R1 resistance value (rated power)
14 V to under 20 V DC 1	kΩ (0.1 W or more)
20 V to under 30 V DC 3	.3 kΩ (0.25 W or more)
30 V to under 50 V DC 5	.6 kΩ (0.5 W or more)

16.2. 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 30V DC and control current of 12mA or less when ON.

At the time of circuit design, consider the control current assuming that 1V appears at the monitor terminal when ON.

[Example of a circuit]

Note

Be sure to connect a diode across the relay in the direction as shown above when connecting to the external relay.

16.3. 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.

16.4. Terminal Pin Arrangement

Terminal Pin No. Pin		name	Unit operation status
			HI-LEVEL LO-LEVEL
CH1, 2 CH	CH1 power	ON/OFF control (input) CH1 power OFF	CH1 power ON
	②	CH1 protection status (output)	CH1 normal	CH1 protection activated (irregular)
	③	CH1 power ON/OFF status (output)	CH1 power OFF CH1	power ON
	④	CH2 power ON/OFF control (input)	CH2 power OFF CH2 power ON
	⑤	CH2 protection status (output)	CH2 normal	CH2 protection activated (irregular)
	⑥	CH2 power ON/OFF status (output)	CH2 power OFF CH2 power ON
	⑦	GND (input/output)	——	——
	⑧	Fan operation status (output)	Fan stop (irregular)	Normal
CH3, 4 CH	CH3 power	ON/OFF control (input) CH3 power OFF	CH3 power ON
	②	CH3 protection status (output)	CH3 normal	CH3 protection activated (irregular)
	③	CH3 power ON/OFF status (output)	CH3 power OFF CH3 power ON
	④	CH4 power ON/OFF control (input)	CH4 power OFF CH4 power ON
	⑤	CH4 protection status (output)	CH4 normal	CH4 protection activated (irregular)
	⑥	CH4 power ON/OFF status (output)	CH4 power OFF CH4 power ON
	⑦	GND (input/output)	——	——
	⑧	Fan operation status (output)	Fan stop (irregular)	Normal

• About operation and terminal status

	HI-LEVEL LO-	LEVEL
Control terminal (input) 9 - 14 V DC	0 - 3 V DC
Monitor terminal (output) OFF 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) Light off Light on
Protection status (output) OFF ON

16.5. Connection Cable and Maximum Cable Length

For the connection cable, use a Category 5 twisted pair cable for LAN (CAT5-UTP).

The maximum cable length is 600m (656.17 yd).

16.6. RJ45 Connector's Pin Arrangement and Cable Color Codes

To Control/Monitor terminal

Category 5 twisted pair cable for LAN (CAT5-UTP)

RJ45 pin No.	Cable color Capble color(for T568B) (for T568A)
①	Orange/white Green/white
②	Orange Green
③	Green/white Orange/white
④	Blue Blue
⑤	Blue/white Blue/white
⑥	Green Orange
⑦	Brown/white Brown/white

17. SPECIFICATIONS

17.1.DA-550FCU

Power Source	120 V AC, 50/60 Hz
Amplification system	Class D
Power Consumption	480 W (based on UL/CSA standards), 2800 W (rated output 4 Ω), 1650 W (rated output 8 Ω)
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 (0.35")
Frequency Response	20 – 20,000 Hz (-2 dB, +1 dB)
Total Harmonic Distortion	0.1% (1 kHz), 0.15% (20 – 20,000 Hz)
Protection circuit	Protection against excessive current flow due to overload, short circuit, unusual DC voltage output, temperature rise at power amp. heat sink (over 100°C or 212°F), temperature rise at power supply heat sink (over 80°C or 176°F)
S/N Ratio	100 dB (A-weighted)
Crosstalk	70 dB (A-weighted)
Control/Monitor	Control input: Power ON/OFF status of the individual channels Photocoupler input drive voltage: 9 V DC (Min) – 14 V (Max), 12 V (Typ) Monitor output: Power ON/OFF status of the individual channels, Protection status of the individual channels, Fan operation status Photocoupler open collector output withstand voltage: 30 V DC control current: under 12 mA Connector: RJ45 connector x 2 Connection cable: Category 5 twisted pair cable for LAN (CAT5-UTP) Maximum cable distance: 600 m (656.17 yd)
LED Indicator	Power (blue) x 1, Input (green) x 4, Output (yellow) x 4, Peak (red) x 4, Protect (red) x 4
Cooling	Forced air cooling
Operating Temperature	-10°C to +40°C (14°F to 104°F)
Operating Humidity	Under 90% RH (no condensation)
Finish	Panel: Aluminum, black, alumite Case: Plated steel sheet
Dimensions	482. (w) x 88.4 (h) x 404.2 (d) mm (18.98" x 3.48" x 15.91")
Weight	8.8 kg (19.4 lb)

^*0dB = 0.775V

Note: The design and specifications are subject to change without notice for improvement.

- Accessories

Removable terminal plug (3 pins) 4

Tamper-proof cap 4

17.2.DA-500F-HL CU

Power Source	120 V AC, 50/60 Hz
Amplification system	Class D
Power Consumption	480 W (based on UL/CSA standards), 2600 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) HPF ON/OFF switch (-6 dB/oct, cut off frequency 50 Hz)
Rated Output	4 channels: 500 W x 4 (70 V line, 9.8 Ω), 550 W x 4 (8 Ω), 100 W x 4 (4 Ω) 2 channels (BRIDGE): 1,000 W x 2 (140 V line, 19.6 Ω), 1,100 W x 2 (16 Ω) M4 screw terminal, distance between barriers: 8.8 mm (0.35")
Frequency Response	20 - 20,000 Hz (-2 dB, +1 dB): HPF OFF 50 - 20,000 Hz (-3 dB, +1 dB): HPF ON
Total Harmonic Distortion	0.1% (1 kHz) 0.3% (20 - 20,000 Hz): HPF OFF 0.3% (100 - 20,000 Hz): HPF ON
Protection circuit	Protection against excessive current flow due to overload, short circuit, unusual DC voltage output, temperature rise at power amp. heat sink (over 100°C or 212°F), temperature rise at power supply heat sink (over 80°C or 176°F)
S/N Ratio	100 dB (A-weighted)
Crosstalk	70 dB (A-weighted)
Control/Monitor	Control input: Power ON/OFF status of the individual channels Photocoupler input drive voltage: 9 V DC (Min) - 14 V (Max), 12 V (Typ) Monitor output: Power ON/OFF status of the individual channels, Protection status of the individual channels, Fan operation status Photocoupler open collector output withstand voltage: 30 V DC, control current: under 12 mA Connector: RJ45 connector x 2 Connection cable: Category 5 twisted pair cable for LAN (CAT5-UTP) Maximum cable distance: 600 m (656.17 yd)
LED Indicator	Power (blue) x 1, Input (green) x 4, Output (yellow) x 4, Peak (red) x 4, Protect (red) x 4
Cooling	Forced air cooling
Operating Temperature	-10°C to +40°C (14°F to 104°F)
Operating Humidity	Under 90% RH (no condensation)
Finish	Panel: Aluminum, black, alumite Case: Plated steel sheet
Dimensions	482. (w) x 88.4 (h) x 404.2 (d) mm (18.98" x 3.48" x 15.91")
Weight	8.8 kg (19.4 lb)

^*0dB = 0.775V
Note: The design and specifications are subject to change without notice for improvement.

- Accessories

Removable terminal plug (3 pins) 4

Tamper-proof cap 4