Inter-m M-500 Bedienungsanleitung

OPERATING MANUAL

POWER

AMPLIFIER

M-500/700/1000

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 main-

tenancy (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 ex-

posture.

Attentions: Pour prévenir les chocs électriques ne pas utilizer 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

• SUBSTANTIAL PROTECTION CIRCUITRY

To insure stability and reliability against over current and overheating extra protection circuitry is

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

speaker.

• BRIDGED MONO FUNCTION

These stereo 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.

• SOFT-START SYSTEM

To prevent inrush current when turn on the amplifier, soft-start circuit is provided on primary power

lines.

FRONT PANEL CONTROLS

1. POWER SWITCH AND INDICATOR

The power switch is used to turn on and off the AC main power.

The power indicator lights up when the amplifier is powered ON.

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

0.1%, indicating that the amplifier is being driven by excessively high inputs.

4. OUTPUT LEVEL INDICATORS

Output level indicating LEDs indicate the output level of this amplifiers. These LEDs illuminate

when the outputs are –40dB and –20dB of rated power.

5. INPUT ATTENUATORS

Separate level controls are provided for channel one and channel two input, clockwise rotation

of the controls increase level. These are 21-step detented input signal attenuators.

6. HANDLES

You can handle this amplifier easily by using these handles.

CHANNEL1

PROT

CLIP

-20dB

-40dB

CHANNEL 2

PROT

CLIP

-20dB

-40dB

POWER

POWER AMPLIFIER

1000

REAR PANEL CONTROLS

1. INPUT TERMINALS (CHANNEL 1, 2)

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 (–).

• PHONE JACK

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

10A/250V

PUSH TO RESET

~AC INPUT

230V 50Hz, 770W

OUTPUT

BRIDGED

(8Ω~16Ω)

BRIDGED

PARALLEL

STEREO

INPUT

BALANCED

0dBm

CH 2

TRS

BALANCED

•TIP=HOT

•RING=COLD

•SLEEVE=GND

XLR

BALANCED

•3=COLD

•2=HOT

•1=GND

PUSH

BALANCED

0dBm

(4Ω~8Ω)

PUSH

CH 1

CH 2

CH 1

HOT

GROUND

COLD

PUSH

HOT

GROUND

COLD

GROUND

HOT

XLR MALE COMBINATION

FOR LINK FOR INPUT

STEREO MODE, BRIDGED MODE AND PARALLEL MODE

2. 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

The minimum impedance for the connected speaker system is specified in “Speaker Im-

penance” on page 6.

3. CIRCUIT BREAKER

When the circuit breaker is cut, push to reset again. In case of occurring trouble to the set by

means of overload or error, circuit breaker will protect the set from trouble by breaking AC power

source.

4. AC POWER CORD

Plug this AC input cord into AC outlet.

5. 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.

6. FANS

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

AMP OUTPUT CH1, CH2

NOT CONNECTED

OUTPUT

BRIDGED

(8Ω~16Ω)

(4Ω~8Ω)

CH 2

CH 1

OUTPUT

BRIDGED

(8Ω~16Ω)

(4Ω~8Ω)

CH 2

CH 1

MONO(BTL)

NOT CONNECTED

CH1 OR CH2

• STEREO MODE

In this mode, channels 1 and 2 operate independently (typical stereo amplifier). Channel 1 input

signal feeds channel 1 power amp, and channel 2 input signal feeds channel 2 power amp. In this

mode, the minimum speaker impedance per channel is 4Ω.

• BRIDGED MODE

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

mode, the minimum speaker impedance is 8Ω.

• 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.

SPEAKER IMPEDANCE

M-500/M-700/M-1000 series amplifier has three operating modes: Stereo, Bridged and Parallel and

allows you to connect multiple speaker systems in parallel. Therefore, the minimum speaker im-

penance 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 BRIDGED MODE CONNECTIONS

OUTPUT

BRIDGED

(8Ω~16Ω)

BRIDGED

PARALLEL

STEREO

TRS

BALANCED

•TIP=HOT

•RING=COLD

•SLEEVE=GND

XLR

BALANCED

•3=COLD

•2=HOT

•1=GND

BALANCED

0dBm

(4Ω~8Ω)

(4Ωmin)

OUTPUT

BRIDGED

(8Ω~16Ω)

BRIDGED

PARALLEL

STEREO

TRS

BALANCED

•TIP=HOT

•RING=COLD

•SLEEVE=GND

XLR

BALANCED

•3=COLD

•2=HOT

•1=GND

BALANCED

0dBm

(4Ω~8Ω)

(8Ωmin)

OUTPUT

BRIDGED

(8Ω~16Ω)

BRIDGED

PARALLEL

STEREO

TRS

BALANCED

•TIP=HOT

•RING=COLD

•SLEEVE=GND

XLR

BALANCED

•3=COLD

•2=HOT

•1=GND

BALANCED

0dBm

(4Ω~8Ω)

(4Ωmin)

OUTPUT

BRIDGED

PARALLEL

STEREO

TRS

BALANCED

•TIP=HOT

•RING=COLD

•SLEEVE=GND

XLR

BALANCED

•3=COLD

•2=HOT

•1=GND

BALANCED

0dBm

(4Ω~8Ω)

(8Ωmin)

BRIDGED

(8Ω~16Ω)

OUTPUT

BRIDGED

(8Ω~16Ω)

BRIDGED

PARALLEL

STEREO

TRS

BALANCED

•TIP=HOT

•RING=COLD

•SLEEVE=GND

XLR

BALANCED

•3=COLD

•2=HOT

•1=GND

BALANCED

0dBm

(4Ω~8Ω)

(8Ωmin)

OUTPUT

BRIDGED

(8Ω~16Ω)

BRIDGED

PARALLEL

STEREO

TRS

BALANCED

•TIP=HOT

•RING=COLD

•SLEEVE=GND

XLR

BALANCED

•3=COLD

•2=HOT

•1=GND

BALANCED

0dBm

(4Ω~8Ω)

(8Ωmin)

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.

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.

• SPEAKER FUSE

The output capacity of your amplifier is very high: 500W+500W (4Ω) in stereo and 1000W (8Ω) in

monaural on the M-1000: 350W+350W (4Ω) in stereo and 700W (8Ω) in monaural on the M-700:

250W+250W (4Ω) in stereo and 500W (8Ω) in monaural on the M-500. Be sure 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.

10mm

POWER AMPLIFIER

SPEAKER SYSTEM

FUSE

Wire should not

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.

10A/250V

PUSH TO RESET

OUTPUT

BRIDGE

(8Ω~16Ω)

BRIDGED

PARALLEL

STEREO

INPUT

BALANCED

0dBm

PUSH

(4Ω~8Ω)

PUSH

CH 2

CH 1

CH 2

CH 1

(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.

–40dB indicator

lights only. 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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