Inter-m L-800 User manual

Operation Manual
Professional Power Amplifier
L800/1400/1800/2400/3000
* Rack mount products in the Western Hemisphere(North America, South America,
and the Caribbean) do not have handles installed due to customer preference.

PROFESSIONAL POWER AMPLIFIER
English
Contents
Contents
Welcome
Warning.........................................................................................................................................1
Unpacking......................................................................................................................................2
Short Form Instructions.....................................................................................................................2
Installation
Environment....................................................................................................................................3
Important Safety Instructions.............................................................................................................3
Description.......................................................................................................................................4
Features............................................................................................................................................4
Accessories.....................................................................................................................................4
Front Panel ......................................................................................................................................5
Rear Panel .......................................................................................................................................6
Applications
Stereo Installation ...........................................................................................................................8
Parallel Installation ..........................................................................................................................8
Bridge Mono Installation ..................................................................................................................9
Linked Installation............................................................................................................................9
Connections..................................................................................................................................10
Block Diagrams.............................................................................................................................11
Specifications ................................................................................................................................13
Service
Procedures....................................................................................................................................14
Schematic.....................................................................................................................................14
Parts List .......................................................................................................................................14
Variations and Options...............................................................................................................14
Warranty .......................................................................................................................................14

PROFESSIONAL POWER AMPLIFIER
1
L800/1400/1800/2400/3000
English
Welcome
Welcome
A personal welcome to you from the management and employees of Inter-M
All of the co-workers here at Inter-M are dedicated to providing excellent products with inherently good value,
and we are delighted you have purchased one of our products.
We sincerely trust this product will provide years of satisfactory service, but if anything is not to your complete
satisfaction, we will endeavor to make things right.
Welcome to Inter-M, and thank you for becoming part of our worldwide extended family!
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.
*Do not install this equipment in a confined space such as a book case or similar unit.
*The apparatus shall not be exposed to dripping or splashing and no objects filled with liquids, such vases, shall be placed on the apparatus.
*Worded: “WARNING FOR YOUR PROTECTION PLEASE READ THE FOLLOWING-WATER AND MOISTURE: Unit should not be used
near water(e.g. near a bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or near a swimming pool, etc). Care should be taken
so than objects do not fall and liquids are not spilled into the enclosure through openings.”
This symbol is intended to alert the user to the
presence of uninsulated “dangerous voltage” within
the product’s enclosure that may be of suf-ficient
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 mainte-nance
(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 expo-sure.
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.

PROFESSIONAL POWER AMPLIFIER
2L800/1400/1800/2400/3000
English
Unpacking
Please take a few minutes to read this manual to familiarize yourself with important information regarding
installation, product features, and operation.
As with most electronic devices, ORIGINAL PACKAGING (OR EQUAL) IS REQUIRED in the unlikely event that
the product needs to be returned for servicing.
Short Form Instructions
1. Do not connect the AC power until step 6. The ac mains POWER switch should be in the OFF position.
2. Adjust both of the LEVEL controls to the fully attenuated position (turn fully counter-clockwise).
3. Connect an appropriate line level input signal to either the balanced XLR or the balanced 1/4” TRS (Tip-
Ring-Sleeve) connector marked INPUTS.
4. Move the MODE selector to the desired position. The Stereo position is the most common.
5. Connect the OUTPUTS to the speaker load according to the mode of operation determined in the previous
step.
6. With the ac mains POWER switch in the OFF position, plug in the supplied Universal AC power cord to the
product and connect to an appropriate AC source.
7. Depress the ac mains POWER switch to the ON position. The indicator within the power switch will
illuminate.
8. The product is ready for operation. Slowly increase the LEVEL control to the desired operating level. Avoid
illuminating the PEAK indicator and do not apply too much power to the speakers.
9. Operate the product and the system in a manner which DOES NOT illuminate the PEAK warning indicator.

PROFESSIONAL POWER AMPLIFIER
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L800/1400/1800/2400/3000
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Installation
Installation
Environment
Never place this product in an environment which could alter its performance or reduce its service life. Such
environments usually include high levels of heat, dust, moisture, and vibration.
Important Safety Instructions
1. Read these instructions.
2. Keep these instructions.
3. Heed all warnings.
4. Follow all instructions.
5. Do not use this apparatus near water.
6. Clean only with dry cloth.
7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including
amplifiers) that produce heat.
9. 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.
10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and
the point where they exit from the apparatus.
11. Only use attachments/accessories specified by the manufacturer.
12. 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.
13. Unplug this apparatus during lightning storms or when unused for long periods of time.
14. 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.
S3125A
S3125A

PROFESSIONAL POWER AMPLIFIER
4L800/1400/1800/2400/3000
English
Description
- L800
A 2U rack space, 2 channel amplifier capable of 800W into 4Ωload (bridged mono).
- L1400
A 2U rack space, 2 channel amplifier capable of 1400W into 4Ωload (bridged mono).
- L1800
A 2U rack space, 2 channel amplifier capable of 1800W into 4Ωload (bridged mono).
- L2400
A 2U rack space, 2 channel amplifier capable of 2400W into 4Ωload (bridged mono).
- L3000
A 2U rack space, 2 channel amplifier capable of 3000W into 4Ωload (bridged mono).
Features
-2Ω-load stable per channel, 4Ω-load stable in bridge mono
-2U rack space
-Selectable High Pass Filter on each channel
-Clip limiter circuitry
-Forced air cooled (front panel intake, rear panel exhaust)
-Front panel indicators for different operating modes
-Front panel indicators for output signal level, clip, protect, and power
-Rack Ears for permanent installation in a standard 19” (rack mount width) enclosure.
-Detachable AC power cord
Accessories
One detachable universal AC mains power cord is provided for use with this product.
Description
- L800
A 2U rack space, 2 channel amplifier capable of 800W into 4Ωload (bridged mono).
- L1400
A 2U rack space, 2 channel amplifier capable of 1400W into 4Ωload (bridged mono).
- L1800
A 2U rack space, 2 channel amplifier capable of 1800W into 4Ωload (bridged mono).
- L2400
A 2U rack space, 2 channel amplifier capable of 2400W into 4Ωload (bridged mono).
- L3000
A 2U rack space, 2 channel amplifier capable of 3000W into 4Ωload (bridged mono).
Features
-2Ω-load stable per channel, 4Ω-load stable in bridge mono
-2U rack space
-Selectable High Pass Filter on each channel
-Clip limiter circuitry
-Forced air cooled (front panel intake, rear panel exhaust)
-Front panel indicators for different operating modes
-Front panel indicators for output signal level, clip, protect, and power
-Rack Ears for permanent installation in a standard 19” (rack mount width) enclosure.
-Detachable AC power cord
Accessories
One detachable universal AC mains power cord is provided for use with this product.

PROFESSIONAL POWER AMPLIFIER
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L800/1400/1800/2400/3000
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Front Panel
Front Panel
1. HANDLES
These are provided for easy transporting and installing into equipment enclosures or racks.
2. LEVEL CONTROL
This control adjusts the level (amplitude) of the input signal for each channel. In stereo or parallel mode the
knobs will determine the signal level independently for each channel. In the bridge mono mode channel 1 will
be turned fully to the right and channel 2 will be turned right only as needed to achieve the desired signal level.
3. LEVEL INDICATOR
These indicators should illuminate during normal operation when there is an output signal.
4. CLIP LIMITER INDICATOR
This warns of a problem when illuminated. Reduce the LEVEL of the device which supplies signal to the
amplifier or reduce the LEVEL control(s) on the amplifier. This should not be continuously illuminated during
normal operation, but may flash occasionally.
5. PROTECTION INDICATOR
This warns of a problem in the system when illuminated. Reduce the volume and look for problems. It is
possible that the amplifier is too hot or the speaker impedance is too low. This should not be illuminated
during normal operation.
6. MODE INDICATOR
This indicates the operating mode based on the position of the MODE selector switch located on the rear panel.
7. POWER INDICATOR
This confirms the amplifier is switched ON and receiving AC mains POWER when illuminated.
8. POWER SWITCH
The position of this switch determines whether the AC mains power is ON or OFF. The power-on status is
confirmed by the illuminated power indicator. Amplifiers are always the last item in a system to be turned on.
It is generally a good idea to reduce the level controls before applying AC mains power.
1234567 8

PROFESSIONAL POWER AMPLIFIER
6L800/1400/1800/2400/3000
English
Rear Panel
Rear Panel
1. AC INPUT
Connect this product to an appropriate AC mains power source using the supplied Universal AC Power Cord.
2. CIRCUIT BREAKER
This protects the amplifier by shutting down the power when the amplifier operates abnormally due to
overload or malfunction. Push to reset.
3. OUTPUT CONNECTORS
Binding Posts and Speakon-type connectors are provided. Bridged Mono operation requires a different
method of connecting the speaker cables than Stereo operation. Be sure than the amplifier is in the correct
mode before connecting the speaker load.
INPUT 1
INPUT 2
PUSH
PUSH
23
14
567
PUSH TO RESET
15A / 250V
TO REDUCE THE RISK
OF ELECTRIC SHOCK,
DO NOT REMOVE COVER.
NO USER SERVICEABLE
PARTS INSIDE. REFER
SERVICING TO QUALIFIED
SERVICE PERSONNEL.
CAUTION
RISQUE DE CHOC ELEC-
TRIQUE NE PAS OUVRIR.
AVIS
CLASS 2 WIRING
www.inter-m.com MODEL NO. L3000
PROFESSIONAL POWER AMPLIFIER
RATED OUTPUT 1000W/CH @4 ΩSTEREO, PARALLEL
RATED OUTPUT 2000W/CH @8 ΩBRIDGED MONO
STEREO
BRIDGED PARALLEL
AMP MODE
BRIDGED MONOCHANNEL 2 CHANNEL 1
SPEAKER OUTPUTS
~AC INPUT
230V 50Hz, 5A 30Hz
OFF 50Hz
HPF
OFF ON
LIM
30Hz
OFF 50Hz
HPF
OFF ON
LIM
MADE IN KOREA
SN
HPF
OFF ON
OFF ON
HPF
30Hz
OFF 50Hz
30Hz
OFF 50Hz
INPUT 1
INPUT 2
LIM
LIM
PUSH
PUSH
CLASS 2 WIRING
MODEL NO. L2400
PROFESSIONAL POWER AMPLIFIER
RATED OUTPUT 750W/CH @4
~AC INPUT
230V 50Hz, 4.5A
PUSH TO RESET
11A / 250V
MADE IN KOREA
SN
23
14
567
- L800/1400/1800/2400
- L3000

PROFESSIONAL POWER AMPLIFIER
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4. MODE SELECTOR SWITCH
Move this switch to select the STEREO, PARALLEL or BRIDGED MONO position as needed for the application.
The Stereo mode is most common. Channel 1 input provides signal through the amplifier to the channel 1
output. The channel 2 input provides signal through the amplifier the channel 2 output.
The Parallel mode uses the channel 1 input provides signal through the amplifier to both the channel 1 and
channel 2 outputs. No input will be supplied to channel 2 in the Parallel mode.
The Bridge Mono mode combines both channels to create one larger mono channel. Input signal applied to
channel 1 will provide signal through the amplifier to the positive terminals of Channel 1 and channel 2. Do
not connect any signal to the channel 2 input or any loads to the negative outputs.
5. BALANCED INPUT CONNECTORS
Each input channel is equipped with a special connector that will accept either a 1/4” TRS or an XLR
connector. Even though the connector is of a special design, the standard rules for wiring the input
connectors apply.
6. CLIP LIMITER SWITCH
The CLIP LIMITER reduces the internal operating level of the amplifier as necessary to insure that signal peaks
do not overdrive the amplifier, causing distortion or damage to the amplifier or loudspeakers. It is
recommended to leave this switched to the “ON” position to reduce distortion and help provide protection to
the loudspeakers.
7. HIGH PASS FILTER SWITCH
Select the switch position that is best suited for your application. The OFF position allows full frequency range
signals to reach the loudspeakers. The 30Hz position reduces the signal amplitude below 30 Hz to conserve
power and help protect the loudspeakers. The 50Hz position reduces the signal amplitude below 50 Hz to
conserve power and help protect the loudspeakers.

PROFESSIONAL POWER AMPLIFIER
8L800/1400/1800/2400/3000
English
Applications
Applications
Stereo Installation
Parallel Installation

PROFESSIONAL POWER AMPLIFIER
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Applications
Applications
Bridged Mono Installation
Linked Installation
Linking is possible when in Stereo/Parallel or Bridged Mono operation

PROFESSIONAL POWER AMPLIFIER
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Connections
Inter-M products are wired according to professionally accepted wiring practices used throughout the world.
Balanced XLR connectors are wired as described:
Pin #1 shield
Pin #2 Positive
Pin #3 Common
Balanced 1/4” TRS connectors are wire as described:
Tip is Positive
Ring is Common
Sleeve is Shield
The combination connector is designed to accept either the XLR or the 1/4” TRS Phone Jack
Stereo operation uses the + (positive) and the – (negative) terminal from each set of channel output binding
posts. (CH1 : 1+, 1- /CH2 : 2+, 2-)
Bridged Mono uses the + (positive) terminal of both channels only. The – (negative) terminals have no
connection. Bridged Mono operation has a minimum load impedance of 4Ω.
- XLR MALE - COMBINATION
- SPEAKON CONNECTOR
Pin set #1
Wiring Diagram
- PHONE JACK
CH2 POSITIVE
NEGATIVE
POSITIVE
NEGATIVE
CH1 CH2 CH1
NEGATIVE
POSITIVE
- STEREO/PARALLEL CONNECTION - BRIDGED MONO CONNECTION
12
3
GROUND HOT
COLD
PUSH
12
3
GROUNDHOT
COLD
1- 1+
2+ 2-
GROUND HOT
COLD

PROFESSIONAL POWER AMPLIFIER
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Block Diagrams
Block Diagrams
- L800/1400/1800/2400

PROFESSIONAL POWER AMPLIFIER
12 L800/1400/1800/2400/3000
- L3000
English

PROFESSIONAL POWER AMPLIFIER
13
L800/1400/1800/2400/3000
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Specifications
Specifications 0dB=0.775Vrms, Half Power=1/2 Power Output Level (Rated Power)
* Specifications and design subject to change without notice.
L800 L1400 L1800 L2400 L3000
Power Output Level
STEREO 1kHz both channels driven
R
L =8Ω@ 0.1% THD 200W 280W 360W 500W 650W
R
L =4Ω@ 0.1% THD 300W 450W 600W 750W 1000W
R
L =2Ω@ 0.5% THD 430W 700W 900W 1200W 1500W
BRIDGED R
L
=8Ω1kHz @ 0.1% THD 600W 900W 1200W 1500W 2000W
R
L =4Ω1kHz @ 0.5% THD 800W 1400W 1800W 2400W 3000W
Frequency Response R
L =8Ω, P=1W 20Hz~20kHz: ±0/1dB, 5Hz~70kHz: -3dB
Total Harmonic Distortion
f=20Hz~20kHz, Half Power(L800/1400)
1/10Power(L1800/2400/3000)
STEREO R
L =8Ω& 4Ω≤0.03%
BRIDGED R
L
=8Ω≤0.03%
Channel Separation Half Power R
L =8Ω,
f=1kHz, ATT. max. Input 600ΩShunt ≥80dB
Residual Noise(DIN Audio Filter) ≤-85dB: ATT min.
Signal-to-Noise Ratio DIN Audio,
Input 600ΩShunt ≥100dB
Input Sensitivity (Rated Power into 4Ω1kHz) 2.7dBu 2.7dBu 3.5dBu 3.5dBu 3.5dBu
Damping Factor R
L
=8Ω, f=1kHz ≥400
Voltage Gain (ATT max.) 4Ωat 1kHz 30dB 32dB 33dB 34dB 38.5dB
Output Circuitry AB Class AB Class H Class H Class H Class
Input Impedance (ATT max.) ≥20kΩ(Balance/Unbalance)
Indicators Power (Blue)
Clip/Limiter (Red)
Signal (Green)
Protection (Red)
Mode Selector (Yellow)
Protection Power SW ON/OFF muting, Full Short circuit,
Thermal protection, RF protection
Fan Circuit Low-Speed - Variable - Hi-Speed
Operating Temperature -10°C ~ +40°C
Power Source 100-120VAC or 220-240VAC; 50/60Hz
(Supplied AC mains transformer depends on country requirements)
Power Consumption(1/8 POWER)
100V-120VAC Both Channel Driven R
L =4Ω6A 7A 8A 9A 11A
230V-240VAC Both Channel Driven R
L =4Ω3A 3.5A 4A 4.5A 5A
Weight
14kg/30.8lb 14.4kg/31.7lb 15kg/33lb 15.6kg/34.6lb 19.5kg/39.5lb
Dimensions 482(W) x 88(H) x 369(D)mm / 19(W) x 3.5(H) x 14.5(D)in
Connector Inputs: balanced combination connector(XLR type+1/4 TRS)
Outputs: 5-Way binding posts x 2, Speakon Terminal x 2

PROFESSIONAL POWER AMPLIFIER
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English
Service
Service
Procedures
Ensure the problem is not related to operator error, or external system devices, Once it is certain that the
problem is related to the product contact your warranty provider as described in the warranty section of this
manual.
Schematic
A Schematic is available by contacting your warranty provider.
Parts List
A Parts List is available by contacting your warranty provider.
Variations and Options
Variations and Options
Variations
Variations of this product exist to reflect the variations in AC power requirements throughout the world. Product
supplied through local sources are compatible with local AC power requirements.
Options
No optional items are available for this product.
Warranty
Warranty
Warranty terms and conditions vary by country and may not be the same for all products. Terms and conditions
of warranty for a given product may be determined first by locating the appropriate country which the product
was purchased in, then by locating the product type.
To obtain specific warranty information and available service locations contact Inter-M directly or the authorized
Inter-M Distributor for your specific country or region.

MADE IN KOREA
May 2006 9000000520
Inter-M, Ltd. (Korea) began operations in 1983.
Since then, Inter-M has grown to become one of the largest manufacturers
of professional audio and commercial sound electronics equipment in the world.
Inter-M has gained worldwide recognition for its own branded products,
as well as private label manufacturing of electronics sold under other names (OEM).
The company is no longer just a Korean company, but rather a global company
that is truly international in scope, with factories and offices in Korea and China,
and sales and marketing operations located in Japan, Europe, and the U.S.A.
With more than 850 employees around the globe,
Inter-M is well-poised for further growth and expansion.
INTER-M AMERICAS, INC.
1 EAST BEACON LIGHT LANE CHESTER, PA USA 19013-4409
TEL : [phone], FAX : [phone]
Home Page : http://www.inter-m.net, E-mail : [email protected]
INTER-M Corporation
SEOUL OFFICE:653-5 BANGHAK-DONG, DOBONG-KU, SEOUL, KOREA
TEL : [phone]~8, FAX : [phone]
Home Page : http://www.inter-m.com, E-mail : [email protected]