Inter-m QD-4240 Manuel utilisateur

OPERATING MANUAL

Q U A D

AMPLIFIER

QD-4240/4480

UNPACKING AND INSTALLATION

Although it is neither complicated to install nor difficult to operate your power Amplifier, a few minutes of your

time is required to read this manual for a properly wired installation and becoming familiar with its many features

and how to use them. Please take a great care in unpacking your set and do not discard the carton and other

packing necessary to return your set for when moving your set and are required if it ever becomes necessary to

return your set for service. Never place the unit near radiators, in front of heating vents, to direct sun light, in

excessive humid or dusty location to avoid early damage and for your years of quality use. Connect your

complementary components as illustrated in the following page.

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION

CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK.

DO NOT REMOVE COVER (OR BACK).

NO USER-SERVICEABLE PARTS INSIDE.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

WARNING

To prevent fire or shock hazard, do not

expose the unit to rain or moisture.

This symbol 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.

This symbol is intended to alert the user to the

presence of important operation and maintenance

(servicing) instructions in the literature accompanying

the appliance.

Caution: To prevent electric shock do not use this (polarized) plug with

an extension cord, receptacle or other outlet unless the blades

can be fully inserted to prevent blade exposure.

Attentions: Pour prévenir les chocs électriques ne pas utiliser cette fiche

polarisée avec un prolongateur, une prise de courant on une

autre sortie de courant, sauf si les lames peuvent étre

insérées à fond sans en laisser aucune partie à découvert.

FEATURES

• 4 CHANNEL AMPLIFIER

These quad amplifier has 4CH Amplifier circuit in the one unit.

• SUBSTANTIAL PROTECTION CIRCUITARY

To insure stability and reliability against over current and overheating extra protection circuitary is provided. In

addition, turn on delay and DC detection circuitary is provided to protect the loud-speaker.

• BRIDGED MONO FUNCTION

These quad amplifiers can be used for monoral powerful sound by selecting the mode switch.

• VARIOUS DISPLAY

To confirm the operating status, LED displays of protection, clip, and signals are provided on front panel.

• COMPACT SIZE

For valuable saving in rack space and slim exterior view, these amplifier is designed within compact size.

APPLICATION

• Home theater/multimedia

• Surround Sound-play back or Mix

• Stereo system with subwoofer

• Distributed sound installations

FRONT PANEL CONTROLS

1. POWER SWITCH AND INDICATOR

Lights whenever the QD-4240/4480 is powered on use this to power the QD-4240/4480 on or off.

2. PROTECTION INDICATOR

This red LED indicator lights up for approximately six seconds when the amplifier is powered ON, indicating

that the soft-start protection system is working. No sound is output during soft-start up. If one of the

protection systems is activated during normal use, this indicator lights up and no sound is output. The

speaker system is actually disconnected from the amplifier outputs when this indicator lights up. The

protection systems are activated when overheating occurs or a DC voltage is present at the amplifier outputs.

If the problem is corrected, the protection systems deactivate automatically, this indicator goes out, and

normal amplifier operation is resumed.

3. CLIP INDICATORS

CLIP indicator on each channel illuminates when distortion reaches or exceeds approximately 0.5%,

indicating that the amplifier is being driven by excessively high inputs.

4. SIGNAL INDICATORS

These green LED indicators light up when the channel’s output signal exceeds 2Vrms (=1

2watt into 8 ohm or

1 watt into 4 ohm).

5. INPUT ATTENUATORS

These are 21-step detented input signal attenuators. Attenuation range is from ∞to infinity (0).

6. HANDLES

You can handle this amplifier easily by using these handles.

POWER

CHANNEL1

CHANNEL2

CLIP

SIG

PROT

SIG

CLIP

PROT

CHANNEL3

CHANNEL4

SIG

CLIP

PROT

SIG

CLIP

PROT

QUAD AMPLIFIE

4480

326 4 3 2 64

REAR PANEL CONTROLS

1. INPUT TERMINALS (CHANNEL 1, 2, 3, 4)

Input connectors are provided both balanced combination jacks. Channel 1 input terminal is used in Bridge

mode and parallel mode.

• XLR-TYPE CONNECTOR

They are wired pin 1-ground, pin 2-hot (+), and pin 3 cold (–).

~ACINPUT

230V,50Hz 420W

S/N

QUADAMPLIFIER

MODEL NO : QD-4480

MADE IN KOREA

CH 1

CH4

CH3

STEREO

BRIDGED

PARALLEL

:BRIDGED:240W(8Ω)X2

OUTPUTPOWER :STEREO:120W(4Ω)X4

STEREO

BRIDGED

PARALLEL

OUTPUT

INPUT

OUTPUT

INPUT

CH 1(4Ω~8Ω)

CH 2(4Ω~8Ω)

BRIDGE

(8~16Ω)

CH 3(4Ω~8Ω)

CH 4(4Ω~8Ω)

BRIDGE

(8~16Ω)

CAUTION;

TO REDUCE THE RISK OF ELECTRIC SHOCK,

DONOT REMOVECOVER. NO USERSERVICEABLE PARTS

INSIDE.

REFERSERVICING TO QUALIFIEDSERVICE PERSONNEL.

AVIS;

RISQUE DE CHOC ELECTRIOUE NE PAS OUVRIR.

CH1

CH 1

CH3

CH2

CH4

BRIDGED MONO USE

CHANNEL 2, 4 CONTROL

IS "O" POSITION, ONLY

CHANNEL1AND3

CONTROL ADJUSTS GAIN

PUSH

CH2

CH1

PUSH

TIP=HOT

RING=COLD

SLEEVE=GND

BALANCED INPUT 0dBm

TRS

1:GND

2:HOT

3:COLD

XLR

TIP=HOT

RING=COLD

SLEEVE=GND

BALANCED INPUT 0dBm

TRS

1:GND

2:HOT

3:COLD

XLR

• PHONE JACK

They are wired tip-hot (+), ring-cold (–), and sleeve-ground.

HOT

GROUND

COLD

GROUND

HOT

XLR MALE COMBINATION

FOR INPUT

2. MODE SELECTOR

Bridged mono or parallel operation are easily accessed by the slide switch. The input is applied channel one

only the corresponding front panel control is used to set the level, please refer bridged mono operation or

parallel operation.

PUSH

HOT

GROUND

COLD

11 3

STEREO MODE, BRIDGED MODE AND PARALLEL MODE

3. OUTPUT TERMINALS

Output terminals are dual five-way binding posts and speaker connectors. Do not parallel the two outputs of

each channel by connecting them (together, or parallel them) with any other amplifier output.

* When speakers are connected through speaker, please make sure correct connection of each pin, and

refer speaker pin number.

• STEREO MODE • BRIDGED MODE

CH 3(4Ω~8Ω)

CH 4(4Ω~8Ω)

BRIDGE

(8~16Ω)

CH 1(4Ω~8Ω)

CH 2(4Ω~8Ω)

BRIDGE

(8~16Ω)

CH 1(4Ω~8Ω)

CH 2(4Ω~8Ω)

BRIDGE

(8~16Ω)

CH 3(4Ω~8Ω)

CH 4(4Ω~8Ω)

BRIDGE

(8~16Ω)

• STEREO MODE

In this mode, each channels operate independently (typical quard amplifier). Channel 1 input signal feeds

channel 1 power amp, and channel 2 input signal feeds channel 2 power amp (channel 3 and 4 are operate

same as channel 1 and 2). In this mode, the minimum speaker impedance per channel is 4Ω.

• BRIDGED MODE

In this mode, channels 1, 2 or 3, 4 are bridged together and work as one mono amplifier. In this mode, the

minimum speaker impedance is 8Ω. (Caution: In this mode, channel 2 and 4 volume is set maximum position

(0)).

• PARALLEL MODE

In this mode, channels 1 and 2 are operate two mono amplifier. In this mode channel 1 input signal feeds

channel 1 and channel 2 power amp, the minimum speaker impedance per channel is 4Ω. Also, channel 3 and

4 are operate same as channel 1 and 2.

4. AC POWER

Plug this AC input cord into AC outlet.

FANS (QD-4240/4480)

The fans should be kept free of all obstructions and be accessible to cool fresh air when possible. It is

important that the fans be used in a dust free environment.

Fans are located in the Amplifier inside.

SPEAKER IMPEDANCE

QD-4240/QD-4480 series amplifier has three operating modes: Stereo, Bridged and Parallel and allows you to

connect multiple speaker systems in parallel. Therefore, the minimum speaker impedance various depending on

the combination of these speakers. Be sure that the speaker impedance falls below the specified impedance.

The figures below show the examples of connection is Stereo mode and Bridged mode, and speaker systems

connected in parallel in Stereo mode, and the respective minimum impedance.

STEREO MODE CONNECTIONS

~AC INPUT

230V,50Hz 420W

QUAD AMPLIFIER

MODEL NO : QD-4480

CH 1

CH 4

CH 3

STEREO

BRIDGED

PARALLEL

: BRIDGED:240W(8Ω)X2

OUTPUT POWER : STEREO:120W(4Ω)X4

STEREO

BRIDGED

PARALLEL

OUTPUT

INPUT

OUTPUT

INPUT

CH 1(4Ω~8Ω)

CH 2(4Ω~8Ω)

BRIDGE

(8~16Ω)

CH 3(4Ω~8Ω)

CH 4(4Ω~8Ω)

BRIDGE

(8~16Ω)

CAUTION;

TO REDUCE THE RISK OF ELECTRIC SHOCK,

DO NOT REMOVE COVER. NO USER SERVICEABLE PARTS

INSIDE.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

AVIS;

RISQUE DE CHOC ELECTRIOUE NE PAS OUVRIR.

CH1

BRI

CHA

IS "O

CHA

CON

PUSH

CH 2

CH 1

PUSH

TIP=HOT

RING=COLD

SLEEVE=GND

BALANCED INPUT 0dBm

TRS

1:GND

2:HOT

3:COLD

XLR

TIP=HOT

RING=COLD

SLEEVE=GND

BALANCED INPUT 0dBm

TRS

1:GND

2:HOT

3:COLD

XLR

(4Ωmin)

S/N

MADE IN KOREA

(8Ωmin)

CH 1

CH 3

CH 2

CH 4

BRIDGED MONO USE

CHANNEL 2, 4 CONTROL

IS "O" POSITION, ONLY

CHANNEL 1 AND 3

CONTROL ADJUSTS GAIN

~AC INPUT

230V,50Hz 420W

QUAD AMPLIFIER

MODEL NO : QD-4480

CH 1

CH 4

CH 3

STEREO

BRIDGED

PARALLEL

: BRIDGED:240W(8Ω)X2

OUTPUT POWER : STEREO:120W(4Ω)X4

STEREO

BRIDGED

PARALLEL

OUTPUT

INPUT

OUTPUT

INPUT

CH 1(4Ω~8Ω)

CH 2(4Ω~8Ω)

BRIDGE

(8~16Ω)

CH 3(4Ω~8Ω)

CH 4(4Ω~8Ω)

BRIDGE

(8~16Ω)

CAUTION;

TO REDUCE THE RISK OF ELECTRIC SHOCK,

DO NOT REMOVE COVER. NO USER SERVICEABLE PARTS

INSIDE.

REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.

AVIS;

RISQUE DE CHOC ELECTRIOUE NE PAS OUVRIR.

PUSH

CH 2

CH 1

PUSH

TIP=HOT

RING=COLD

SLEEVE=GND

BALANCED INPUT 0dBm

TRS

1:GND

2:HOT

3:COLD

XLR

TIP=HOT

RING=COLD

SLEEVE=GND

BALANCED INPUT 0dBm

TRS

1:GND

2:HOT

3:COLD

XLR

S/N

MADE IN KOREA

BRIDGED MODE CONNECTIONS

CAUTION FOR SPEAKER CONNECTION

1. Turn off the POWER switch.

2. After removing approx. 10 mm of insulation from the ends of the speaker cables, pass the bare ends of the

speaker wires through the holes in the corresponding speaker terminals and tighten the terminals to securely

clamp the wires.

Refer to page 4 for speaker porality.

10mm

POWER AMPLIFIER

SPEAKER SYSTEM

FUSE

Wire should not

touch the chassis

• SPEAKER FUSE

The output capacity of this amplifier is high: 120W 4CH (4Ω) in stereo and 240W 2CH (8Ω) in monaural on

the QD-4480: 60W 4CH (4Ω) in stereo and 120W 2CH (8Ω) in monaural on the QD-4240. Besure to use a

speaker system that has sufficient input capacity.

If the input capacity of your speaker system is lower than the rated output of the power amplifier, you can

protect your speakers by connecting a fuse serially between the speaker and amplifier as shown below.

At this time make sure that the bare ends of the speaker cables do not extend from the terminals in such a

way that they touch the chassis.

Use the following formula to determine the fuse capacity according to the speaker’s input capacity.

Po = I2R I =

P0 [W]: Speaker’s continuous input capacity (noise or RMS)

R [Ω] : Speaker’s nominal impedance

I [A] : Required fuse capacity

ex.) Speaker’s continuous input capacity: 100W

Speaker’s impedance: 8Ω

I = = 3.5

In this example, the required fuse capacity is calculated as 3.5 [A].

• SPEAKER CABLE

If you use a long speaker cable, use as thick a cable as possible to prevent deterioration of the damping factor

or power loss inside the cable. Even the thickest cable can be used for the speaker terminal of this unit.

PORTABLE RACK MOUNTING

The amplifier intakes cool air through the front panel and exhausts warm air out the rear panel. When mounting

amplifiers in a portable rack, make sure the rear panel is completely open for ventilation.

CH 1

PUSH

(Side View)

Front Air exhaust

Air intake

(Rear View)

Completely open

100

POSITIONING THE HOUSED AMPLIFIER

Place the case so that the ventilation airflow paths are not blocked.

TROUBLESHOOTING

The following table lists the main causes of abnormal operation and the corrective measures required, as well

as the protective circuit operation in each case.

Indicator Probable Cause Remedy Protection Circuit

CLIP indicator

lights.

There is a short at a

speaker terminal,

amplifier terminal, or

wire.

The amplifier load is

excessive.

DC voltage of +/–2V

or greater was generated

in the power amplifier’s

output circuit.

Consult your dealer. The relay operates to

protect the speaker

system.

The heat sink

temperature has

exceeded 100˚C.

Locate and correct the

cause of the short.

Use a speaker system

with an impedance of at

least 4Ω(stereo) or 8Ω

(bridge).

Check the amplifier

ventilation conditions

and take appropriate

measures to improve

airflow around the

amplifier.

The PC limiter circuit

operates to protect the

power transistors.

Same as above.

The thermal protection

circuit operates to

protect the power

transistors.

PROTECTION

indicator lights.

Front

Less than 10 cm

NO NO

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