Inter-m M-500, M-1000, M-700 Operating Manual

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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 maintenancy (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 exposture.

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 loudspeaker.

• 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 INDICA TOR

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 INDICA TOR

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 softstart 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 INDICA TORS

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 INDICA TORS

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.

10111213141618212723456789

1112131416182127801001234567890

CHANNEL1

PROT

CLIP

-20dB

-40dB

10111213141618212723456789

1112131416182127801001234567890

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

213

HOT

GROUND

COLD

PUSH

213

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 Impenance” 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

1-1+2+2-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

1-1+2+2-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 impenance 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)

(4Ω min)

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)

(8Ω min)

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)

(4Ω min)

OUTPUT

BRIDGED

PARALLEL

STEREO

TRS BALANCED

•TIP=HOT

•RING=COLD

•SLEEVE=GND

XLR BALANCED

•3=COLD

•2=HOT

•1=GND

BALANCED

0dBm

(4Ω~8Ω)

(8Ω min)

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)

(8Ω min)

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)

(8Ω min)

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 (8 Ω) 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

1100

SPECIFICATIONS

M-500 M-700 M-1000

(Front) Power SW: Push up On/Push down Off

Attenuator: 21-position dB calibrated

(Rear) Mode Sw: Bridge=BTL/STEREO/PARALLEL UL & Canadian Model: 120V, 60Hz

General Model: 230V, 50Hz British Model: 240V, 50Hz

420W 520W 770W

12kg/26.4lb 15kg/33lb 17kg/37.5lb

482(W) x 88(H) x 369(D) mm/19(W)x3.5(H)x14.5(D)in Input XLR-3-31 type + 1/4" Phone (balanced), XLR

Output5-Way binding posts x 2, Speakon Terminal x 2

Power Output Level

f=1KHz, THD+N≤0.05% (Typical)

STEREO RL=8Ω

RL=4Ω

BRIDGED RL=8Ω

One Channel Driven

f=1KHz THD+N≤0.05% RL=8Ω Frequency Response RL=8Ω, P.=1W Power Bandwidth Half Power, THD+N≤0.1%

STEREO RL=8Ω

Total Harmonic Distortion (THD+N)

f=20Hz~20KHz, Half Power

STEREO RL=8Ω

RL=4Ω

BRIDGED RL=8Ω

Channel Separation Half Power RL=8Ω,

f=1KHz, ATT. max. Input 600Ω shunt Residual Noise (DIN Audio Filter) Signal-to-Noise Ratio DIN Audio,

Input 600Ω Shunt Damping Factor RL=8Ω, f=1KHz Slew Rate 8Ω Full Swing STEREO

BRIDGED

Sensitivity (ATT max.)

Rated Power into 4Ω 1KHz Voltage Gain (ATT max.) 4Ω 1KHz Input Impedance (ATT max.) Indicators

Protection

PC Limiter Fan Circuit

Controls

Power Source

Power Consumption Weight Dimensions Connectors

130W+130W 220W+220W 330W+330W 250W+250W 350W+350W 520W+520W

500W 700W 1000W 150W 250W 350W

0dB+0.5, –1.5dB: f=DC~55KHz

10Hz~70KHz

≤ 0.05% ≤ 0.07% ≤ 0.07%

≥ 80dB

≤ –70dB: ATT min.

≥100dB

≥150

±40V/µs

0dBm

32dB 33.5dB 35dB

≥ 20KΩ (Balance/Unbalance)

Power (Red) Protection (Mute) x 2 (Red) Clip x 2 (Orange) Signal x 4 (Green)

Power SW ON/OFF muting Heatsink Temp ≥ 100˚C (212˚F)

RL < 2Ω –50˚C (122˚F)–60˚C (140˚F)–

Low-Speed – Variable – Hi-Speed

0dB=0.775 Vrms, Half Power=1/2 Power Output Level (Rated Power) * Using reactive 2Ω speakers at high power levels may cause overheating, excessive power consumption, and shutdowns.

Please note that below 2Ω the PC limiter will work. Before using 2Ω speakers in a real application, test the system completely.

MADE IN KOREA

Inter-m M-500, M-1000, M-700 Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual