M-1500/2000
POWER
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POWER AMPLIFIER
M
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Power Amplifier
Contents
Contents
1. Unpacking and Installation.....................................................................................................1
2. Features ................................................................................................................................2
3. Front Panel Controls...............................................................................................................3
4. Rear Panel Controls ...............................................................................................................4
5. Protection Circuitry.................................................................................................................6
6. Bridged and Parallel Modes ...................................................................................................7
7. Connections...........................................................................................................................8
8. Link Connectors .....................................................................................................................9
9. Speaker Impedance ...............................................................................................................9
10. Caution for Speaker Connection .........................................................................................10
11. Portable Rack Mounting.....................................................................................................11
12. Positioning the Housed Amplifier........................................................................................12
13. Troubleshooting.................................................................................................................12
14. Block Diagram...................................................................................................................13
15. Specifications.....................................................................................................................14
OFFICE :
226-9 DUGJUNG - LI, HOE CHUN - EUB,
YANGJU - KUN, KYUNGKI - DO, KOREA
TEL : 82-351-860-7041~5, FAX : 82-351-858-1907
Home Page : http://www.inter-m.co.kr
E-mail : export@inter-m.co.kr
POWER AMPLIFIER
Unpacking and Installation
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.
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
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.
M-1500/2000
1
POWER AMPLIFIER
Features
Features
- 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 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.
- SPEED CONTROLLED FAN
Dual temperature-sensitive speed-controlled fans for reliable cooling without thermal and overheating problems.
- COMBINATION INPUT CONNECTOR
Combination input connectors for each channel accommodate both balanced XLR or balanced 1/4” TRS
plugs, as well as both Speakon
- TRANSFORMER
Toroidal transformer power supply for high current and low profile.
TM
and banana jack output connectors for maximum flexibility.
2
M-1500/2000
Front Panel Controls
POWER
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P
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4
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d
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d
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C
L
IP
P
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POWER AMPLIFIER
M
2000
17
22
13
10
0
1
229
54
19
15
11
12
9
8
7
5
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3
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6 6
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1 2 43123
Front Panel ControlsFront Panel Controls
POWER AMPLIFIER
1. 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.
2. 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.
3. 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.
4. 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.
5. 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.
6. HANDLES
You can handle this amplifier easily by using these handles.
M-1500/2000
3
POWER AMPLIFIER
PUSH TO RESET
20A / 250V
(4Ω ~ 8Ω)(4Ω ~ 8Ω)
BRIDGED
(8Ω~16Ω)
(4Ω ~ 8Ω)(4Ω ~ 8Ω)
CH 1CH 2
OUTPUT
BALANCED
0dBm
BALANCED
0dBm
CH 1CH 2
~AC INPUT
230V 50Hz, 1300W
STEREO
BRIDGED
PARALLEL
INPUT
XLR
BALANCED
•3=COLD
•2=HOT
•1=GND
•TIP=HOT
•RING=COLD
•SLEEVE=GND
TRS
BALANCED
PUSH PUSH
6
5
1 2431
Rear Panel Controls
Rear Panel Controls
1. FANS
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.
2. CIRCUIT BREAKER
When the circuit breaker is cut, push to reset again. In case of occuring trouble to the set by means of
overload or error, circuit breaker will protect the set from trouble by breaking AC power source.
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
OUTPUT
BRIDGED
AMP OUTPUT CH1, CH2
1- 1+
(8Ω~16Ω)
(4Ω ~ 8Ω)(4Ω ~ 8Ω)
NOT CONNECTED
1- 1+
OUTPUT
BRIDGED
(8Ω~16Ω)
(4Ω ~ 8Ω)(4Ω ~ 8Ω)
The minimum impedance for the connected speaker system is specified in “Speaker Impedance” on page 6.
4
M-1500/2000
2+ 2-
NOT CONNECTED
(4Ω ~ 8Ω)(4Ω ~ 8Ω)
CH 1CH 2
2+ 2-
MONO(BTL)
CH1 OR CH2
(4Ω ~ 8Ω)(4Ω ~ 8Ω)
CH 1CH 2
4. INPUT TERMINALS (CHANNEL 1, 2)
PUSH
12
3
12
3
GROUND
GROUND
HOT
HOT
COLD
COLD
XLR MALE COMBINATION
FOR LINK FOR INPUT
GROUND HOT
COLD
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 (–).
POWER AMPLIFIER
- PHONE JACK
They are wired tip-hot (+), ring-cold (–), and sleeve-ground.
5. AC INLET
Plug this AC input cord into AC outlet.
6. 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.
WARNING: Due to the extremely high power output of the M-1500/2000 when used in Bridged mode,
be sure to use only loudspeakers sufficiently rated to handle the resultant wattage (in
Bridged mode, these must be 8-ohm speakers).
M-1500/2000
5
POWER AMPLIFIER
Protection Circuitry
Protection Circuitry
As noted in the “Guided Tour” section of this manual, the M-1500/2000 front-panel Protection LED indicates the activity of the relay speaker connection circuitry. When the Protection LED is lit, this circuitry is
active, and all connected speakers are muted (provided with 0 volts DC), thus protecting them and preventing any audible “thump” from occurring.
The following conditions will cause the Protection LED to go on:
- INITIAL POWER-UP
For approximately five seconds after initial power-up, the protection circuitry is activated and the speaker output is muted. If everything is operating normally, you will hear an audible click at the conclusion of
this brief period, as the protection circuitry is deactivated and the M-1500/2000 begins delivering signal to connected speakers (at which point you’ll hear a click). It is normal for the Protection LED to fade
gradually after the amplifier is powered off.
WARNING: If the Protection LED fails to go out (and you fail to hear the accompanying audible click)
approximately five seconds after power-up, turn the M-1500/2000 off immediately and
check all external devices and wiring for possible shorts or other defects.
- OVERHEATING
A temperature sensing device in the M-1500/2000 will cause the protection circuitry to be activated
(and the Protection LED to go on) whenever the operating temperature of the unit rises above a safe level. To guard against this problem, make sure the M-1500/2000 receives adequate ventilation on all
sides and that both the front and rear panels are unobstructed.
- SEVERE OVERCURRENT CONDITIONS
This occurs whenever the signal being input to the M-1500/2000 rises to a level above 20% THD (Total
Harmonic Distortion).
- SHORTED SPEAKER CABLES
This will occur if, due to faulty wiring, the hot and ground signals being output by the M-1500/2000
short one another.
- OUTPUT IMPEDANCE DROPS BELOW 2 OHMS
This can occur if the M-1500/2000 is connected to inappropriate speaker systems (see the “Setting Up
and Using Your M-1500/2000” section on page 5 in this manual for more information).
- DC VOLTAGE DETECTED AT SPEAKER OUTPUT
The most likely cause of this is an internal failure.
In general, any time the Protection LED lights up (other than during the approximately five seconds following
initial power-up), there is reason to be concerned. If this occurs, turn the M-1500/2000 off immediately
and carefully check all wiring and external devices in order to locate and correct the condition that caused
the LED to light up in the first place.
6
M-1500/2000
POWER AMPLIFIER
Bridged and Parallel Modes
Bridged and Parallel Modes
The M-1500/2000 provides a rear-panel switch that allows it to be used in either a Bridged or Parallel
mode. When this switch is placed in the “STEREO” (center) position, the M-1500/2000 functions as a true
stereo amplifier, where both of the two independent amplifier channels (Channel 1 and Channel 2) can
receive different input signals and produce independent output signals.
However, when the switch is placed in the “BRIDGED” (left) position, the Channel 1 inputs signal is routed to
both power amplifiers bridged together, producing a single output signal with a true 1500 watt output into
a single 8 ohm channel (in the case of the M-1500) or a true 2000 watt output into a single 8 ohm channel
(in the case of the M-2000).
WARNING: Bridged mode is to be used only when the M-1500/2000 is connected to an 8Ω speaker
load. Use of Bridged mode with speaker loads of 4Ωs or less can result in severe damage to
the unit due to excessive heat and current limiting and will void your warranty!
The illustration belows shows how this works. In Bridged mode, the polarity (phase) of the Channel 2 output
signal is reversed relative to that of the Channel 1 output signal. Both channels then process the same input
signal, with the speaker load connected so that power is derived from both channels. The effective voltage
swing seen by the load is thus doubled, so that the power output is doubled.
Bridged Mode
INPUT
CHANNEL
1(+) OUTPUT
CHANNEL
2(+) OUTPUT
When using the M-1500/2000 in Bridged mode, be sure to connected your loudspeaker as shown in the
illustration on page 9 (and as silkscreened on the rear panel), with the red (+) terminal of the Channel 2
output connected to the negative input of the speaker and the red (+) terminal of the Channel 1 output connected to the positive input of the speaker. Do not use the black ground (–) output terminal of either channel
(the speaker load must “float” away from the amplifier chassis).
When the rear panel switch is placed in the right “PARALLEL” position, the M-1500/2000 operates in a
unique Parallel mode. In this mode, only the signal present at the Channel 1 input is used (and only the
Channel 1 input control is functional). This signal is then routed to both the Channel 1 and Channel 2 power
amplifiers, thus producing a dual mono output, with 750 watts per channel into 4 ohms (in the case of the
M-1500) or 1000 watts per channel into 4 ohms (in the case of the M-2000).
See pages 8 in this manual for interconnection diagrams when using M-1500/2000 in Bridged or Parallel
modes.
M-1500/2000
7
POWER AMPLIFIER
Connections
Connections
STEREO MODE
BRIDGED MODE
PARALLEL MODE
8
M-1500/2000
POWER AMPLIFIER
PUSH TO RESET
20A / 250V
(4Ω ~ 8Ω)(4Ω ~ 8Ω)
BRIDGED
(8Ω~16Ω)
(4Ω ~ 8Ω)(4Ω ~ 8Ω)
CH 1CH 2
OUTPUT
BALANCED
0dBm
BALANCED
0dBm
CH 1CH 2
~AC INPUT
230V 50Hz, 1300W
STEREO
BRIDGED
PARALLEL
INPUT
XLR
BALANCED
•3=COLD
•2=HOT
•1=GND
•TIP=HOT
•RING=COLD
•SLEEVE=GND
TRS
BALANCED
PUSH PUSH
PUSH TO RESET
20A / 250V
(4Ω ~ 8Ω)(4Ω ~ 8Ω)
BRIDGED
(8Ω~16Ω)
(4Ω ~ 8Ω)(4Ω ~ 8Ω)
CH 1CH 2
OUTPUT
BALANCED
0dBm
BALANCED
0dBm
CH 1CH 2
~AC INPUT
230V 50Hz, 1300W
STEREO
BRIDGED
PARALLEL
INPUT
XLR
BALANCED
•3=COLD
•2=HOT
•1=GND
•TIP=HOT
•RING=COLD
•SLEEVE=GND
TRS
BALANCED
PUSH PUSH
Link Connectors
Link Connectors
The illustration belows shows how multiple amplifiers can be interconnected using the M-1500/2000 link
The illustration belows shows how multiple amplifiers can be interconnected using the M-1500/2000 link
connectors.
connectors.
TO ADDITIONAL AMPLIFIERS
Speaker Impedance
Speaker Impedance
M-1500/2000 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 8 page 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.
M-1500/2000
9
POWER AMPLIFIER
10mm
Wire should not
touch the chassis
POWER AMPLIFIER
SPEAKER SYSTEM
FUSE
Caution for Speaker Connection
Caution for Speaker Connection
1. Turn off the POWER switch.
2. After removing approx. 10mm 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 8 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: 1000W+1000W (4Ω) in stereo and 2000W (8Ω) in
monaural on the M-2000: 750W+750W (4Ω) in stereo and 1500W (8Ω) in monaural on the M-1500.
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.
10
M-1500/2000
POWER AMPLIFIER
FAN
Air Intake
Air Exhaust
Front
(Side View)
(Rear View)
Completely Open
PUSH TO RESET
20A / 250V
(4Ω ~ 8Ω)(4Ω ~ 8Ω)
BRIDGED
(8Ω~16Ω)
(4Ω ~ 8Ω)(4Ω ~ 8Ω)
CH 1CH 2
OUTPUT
BALANCED
0dBm
BALANCED
0dBm
CH 1CH 2
~AC
230V 50Hz, 1300W
STEREO
BRIDGED
PARALLEL
INPUT
XLR
BALANCED
¥3=COLD
¥2=HOT
¥1=GND
¥TIP=HOT
¥RING=COLD
¥SLEEVE=GND
TRS
BALANCED
PUSH PUSH
Use the following formula to determine the fuse capacity according to the speaker’s input capacity.
Use the following formula to determine the fuse capacity according to the speaker’s input capacity.
Po = I 2 R I =
Po = I 2 R I =
P0 [W]: Speaker’s continuous input capacity (noise or RMS)
P0 [W]: Speaker’s continuous input capacity (noise or RMS)
R [Ω]: Speaker’s nominal impedance
R [Ω]: Speaker’s nominal impedance
I [A] : Required fuse capacity
I [A] : Required fuse capacity
ex.) Speaker’s continuous input capacity: 100W
ex.) Speaker’s continuous input capacity: 100W
Speaker’s impedance: 8Ω
Speaker’s impedance: 8Ω
100
I = = 3.5
I = = 3.5
8
In this example, the required fuse capacity is calculated as 3.5 [A].
In this example, the required fuse capacity is calculated as 3.5 [A].
- SPEAKER CABLE
- SPEAKER CABLE
If you use a long speaker cable, use as thick a cable as possible to prevent deterioration of the damping
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
factor or power loss inside the cable. Even the thickest cable can be used for the speaker terminal of this
unit.
unit.
Po
R
Portable Rack Mounting
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.
M-1500/2000
11
Front
Front
Less than 10cm
( X ) ( X )
POWER AMPLIFIER
Positioning the Housed Amplifier
Positioning the Housed Amplifier
Place the case so that the ventilation airflow paths are not blocked.
Troubleshooting
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
–40dB indicator
lights only.
CLIP indicator
lights.
PROTECTION
indicator lights.
There is a short at a
speaker terminal,
amplifier terminal, or
wire.
The amplifier load is
excessive.
The heat sink
temperature has
exceeded 100˚C.
DC voltage of +/–2V
or greater was generated
in the power amplifier’s
output circuit.
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.
Consult your dealer. The relay operates to
The PC limiter circuit
operates to protect the
power transistors.
Same as above.
The thermal protection
circuit operates to
protect the power
transistors.
protect the speaker
system.
12
M-1500/2000
Block Diagram
Block Diagram
POWER AMPLIFIER
M-1500/2000
13
POWER AMPLIFIER
Specifications
Specifications
Power Output Level
f=1kHz, THD+N≤0.05% (Typical)
STEREO RL=8Ω
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
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
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 120V
Weight
Dimensions
Connectors
RL=4Ω
RL=4Ω
BRIDGED
230V–240V
M-1500 M-2000
500W+500W 670W+670W
750W+750W 1000W+1000W
1500W 2600W
500W 670W
0dB+0.5, –1.5dB: f=DC~55kHz
10Hz~40kHz
≤ 0.05%
≤ 0.07%
≤ 0.07%
≥ 80dB
≤ –70dB: ATT min.
≥100dB
≥150
±40V/µs
0dBm
37dB 38.2dB
≥ 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
(Front) Power SW: Push up On/Push down Off
(Rear) Mode SW: Bridge=BTL/STEREO/PARALLEL
AC 110V–240V, 50/60Hz
482(W) x 132(H) x 369(D) mm
Input XLR-3-31 type + 1/4” Phone (balanced), XLR
Output 5-Way binding posts
Attenuator: 21-position dB calibrated
1030W (1200VA) 1450W (1680VA)
950W 1300W
20kg 23kg
2, Speakon Terminal 2
14
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.
* Specifications and design subject to change without notice for improvements.
M-1500/2000
NOTE
NOTE
NOTE
MADE IN KOREA
9007902810
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