Martin Audio LE12J User manual

Martin Audio – LE SERIES

CONTENTS (ENGLISH) Page No

1 INTRODUCTION 2

2 UNPACKING 2

3 OVERVIEW 2

3.1 LE350A 3

3.2 LE12J 3

3.3 LE400C 3

3.4 LE700A 3

4 SAFETY FIRST 3

5 AMPLIFICATION 4

6 CONNECTIONS 5

7 CABLE LENGTHS 5

8 WARRANTY 6

9 TECHNICAL SPECIFICATIONS 7

MARTIN AUDIO

LONDON

The Martin Experience

CONTENTS

GUIDES

1 INTRODUCTION

Thank you for purchasing a Martin Audio LE Series monitor. LE Series

monitors have always set the industry standard for touring and stage

applications. All monitors except the LE400C utilise differential dispersion

horn technology to define a high frequency coverage footprint that is

particularly useful for stage monitor applications.

2 UNPACKING

Each Martin Audio loudspeaker is built to the highest standard and

thoroughly inspected before it leaves the factory. After unpacking the

system, examine it carefully for any signs of transit damage and inform

your dealer if any such damage is found. It is suggested that you retain

the original packaging so that the system can be repacked at a future

date if necessary.

Please note that Martin Audio and its distributors cannot accept any

responsibility for damage to any returned product through the use of

non-approved packaging.

3 OVERVIEW

The LE Series products covered in this guide include the LE350A, LE12J,

LE400C and LE700A. All except the LE400C feature differential dispersion

horn technology. A differential dispersion horn varies its horizontal

dispersion from wide to narrow as a performer moves back from the

monitor. This narrowing dispersion effectively changes the forward gain of

the horn which enables the horn to throw further, increasing the operating

range of the monitor and reducing excess spill.

For optimum performance, it is recommended that the LE Series monitors

in active mode are used with the MX5 System Controller or an appropriate

digital controller such as the Martin Audio DX1. Please refer to the

appropriate controller user guide for information on connections and correct

limiter settings.

Martin Audio – LE SERIES

ENGLISH

This equipment conforms to the requirements of the

EMC Directive 89/336/EEC, amended by 92/31/EEC

and 93/68/EEC and the requirements of the Low

Voltage Directive 73/23/EEC, amended by 93/68/EEC.

Standards Applied EMC Emission EN55103-1:1996

Immunity EN55103-2:1996

Electrical Safety EN60065:1993

CONTENTS

GUIDES

3.1 LE350A

The LE350A is a low-profile monitor with differential dispersion horn

technology and a 12" (305mm) bass driver. It is normally supplied as a

passive system, available active to order. It can be configured as a left or

right-handed monitor by unscrewing the baffle and moving the horn to the

required end.

3.2 LE12J

Featuring differential dispersion horn technology, the LE12J utilises a high

sensitivity 12" (305mm) bass driver and a 1.4" (35mm) exit titanium

diaphragm compression driver. It is an active 2-way system and is supplied

in either left or right-handed versions. It is capable of extremely high output

levels for its small size and its horizontal coverage pattern of 100 degrees

at close range and 50 degrees at distance is ideal for stage monitor

situations.

3.3 LE400C

The LE400 has become the industry standard wedge monitor. The LE400C

utilises a 15" (385mm) bass driver and a high frequency compression driver

mounted on a 40 x 70 degree horn. It features a twin-angle enclosure

design, a rotatable baffle to avoid the need for dedicated left and right-

handed versions and a switchable active/passive crossover.

3.4 LE700A

The LE700A is an active 2-way monitor with a high power 15" (385mm)

bass driver and a 1.4" (35mm) exit compression driver mounted on a

differential dispersion horn. This horn design allows the artist to move

freely over a large area without loss of information. For flexibility, the

LE700A has a rotatable baffle to allow left or right-handed configurations.

4 SAFETY FIRST

It is important that loudspeaker systems are used in a safe manner.

Please take some time to review the following points concerning safe use

of LE Series loudspeakers.

Professional loudspeakers are capable of producing extremely high sound

levels and should be used with care. Hearing loss is cumulative and can

result from levels above 90dB if people are exposed for a long period.

Never stand close to loudspeakers driven at high level.

Martin Audio – LE SERIES

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CONTENTS

GUIDES

5 AMPLIFICATION

LE Series monitors are designed to be used with professional power

amplifiers capable of producing the following power outputs into 4 ohms:

LE350A 500-700W

LE12J 500-700W

LE400C 500-700W

LE700A 550-800W

Care should be taken to avoid amplifier clipping. It is important to

understand that a low power amplifier driven into clipping is more likely to

damage a loudspeaker than a higher power amplifier used within its ratings.

This is because music signals have a high peak-to-average "crest" factor.

When an amplifier is severely overdriven, its output waveform is clipped (its

peaks are squared off) – reducing the crest factor. In extreme cases, the

waveform can approach that of a square wave. An amplifier is normally

capable of producing far more power under these conditions than its

undistorted rated power output.

The use of very high power amplifiers with outputs greater than those

recommended is discouraged.

Care should be taken to avoid switch-on surges, which can result in

momentary power peaks in excess of specified ratings. When powering up

a sound system it is important to switch on the amplifiers after the mixer

and control electronics have stabilised. When powering down the system,

reverse the sequence and switch off the amplifiers first.

Martin Audio – LE SERIES

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CONTENTS

GUIDES

6 CONNECTIONS

The LE350A and LE12J are fitted with two Neutrik Speakon NL4 connectors

wired in parallel.

LE350A Passive LE12J Active NL4

Input - LF - -1

Input + LF + +1

N/C HF - -2

N/C HF + +2

The LE400C is fitted with two Neutrik Speakon NL4 connectors wired in

parallel plus an XLR connector.

LE400C Passive LE400C Active NL4 XLR

Input - LF - -1 1

Input + LF + +1 2

N/C HF - -2

N/C HF + +2

The LE700A is fitted with two Neutrik Speakon NL4 connectors wired in

parallel plus an EP8 connector.

LE700A Active NL4 EP8

LF - -1 1 & 3

LF + +1 2 & 4

HF - -2 5 & 7

HF + +2 6 & 8

7 CABLE LENGTHS

When connecting loudspeaker systems to an amplifier, it is recommended

that the return resistance of the cable used is less than one tenth of the

nominal impedance of the system or systems in parallel. The table below

gives an indication of the maximum permissible cable runs for various

conductor cross-sectional areas.

Conductor CSA Maximum Cable Run

4 ohms 8 ohms 16 ohms

1.0mm211m 22m 44m

1.5mm217m 34m 68m

2.0mm222m 44m 88m

2.5mm229m 58m 116m

4.0mm244m 88m 176m

6.0mm266m 132m 264m

Martin Audio – LE SERIES

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CONTENTS

GUIDES

8 WARRANTY

Martin Audio LE Series products are warranted against manufacturing defects

in materials or craftsmanship over a period of 5 years from the date of original

purchase. During the warranty period Martin Audio will, at it's discretion,

either repair or replace products which prove to be defective provided that the

product is returned in its original packaging, shipping prepaid, to an authorised

Martin Audio service agent or distributor.

Martin Audio Ltd. cannot be held responsible for defects caused by

unauthorised modifications, improper use, negligence, exposure to inclement

weather conditions, act of God or accident, or any use of this product that is

not in accordance with the instructions provided by Martin Audio.

Martin Audio is not liable for consequential damages.

This warranty is exclusive and no other warranty is expressed or implied.

This warranty does not affect your statutory rights.

Martin Audio – LE SERIES

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CONTENTS

GUIDES

9 TECHNICAL SPECIFICATIONS

LE350A

TYPE Passive monitor

BANDWIDTH 70Hz-18kHz ±3dB

DRIVERS 12” (305mm) dia., 3” (75mm) voice coil

1” (25mm) exit compression driver

RATED POWER 300W AES, 1200W peak.

RECOMMENDED AMPLIFIER 500-700W into 4 ohms

SENSITIVITY 97dB

MAXIMUM SPL 119dB continuous,

125dB peak

IMPEDANCE 8 ohms nominal

CROSSOVER 1500Hz

DISPERSION 50-100 degs horizontal

(differential dispersion),

70 degs vertical

ENCLOSURE 36 litres

CONNECTORS 2 x Speakon

DIMENSIONS (W) 607mm x (H) 318mm x(D) 428mm

(W) 23.9ins x (H) 12.5ins x (H) 16.9ins

WEIGHT 23.2kg (51lbs)

SHIPPING DIMENSIONS (W) 710mm x (H) 420mm x (D) 510mm

(W) 28ins x (H) 16.5ins x (D) 20.1ins

SHIPPING WEIGHT 16kg (35.3lbs)

Martin Audio – LE SERIES

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CONTENTS

GUIDES

LE12J

TYPE Two way active monitor

BANDWIDTH 65Hz-18kHz ±3dB

DRIVERS 12” (305mm) dia. 3” (75mm) voice coil

1.4” (35mm) exit compression driver

RATED POWER LF: 300W AES, 1200W peak.

HF: 75W AES, 300W peak.

RECOMMENDED AMPLIFIER 500-700W into 4 ohms

SENSITIVITY LF: 98dB / HF: 106dB

LF: 121dB continuous, 127dB peak

HF: 124dB continuous 130 dB peak

IMPEDANCE LF: 8 ohms nominal

HF: 16 ohms nominal

CROSSOVER 1300Hz

DISPERSION 50-100 degs horizontal

(differential dispersion),

70 degs vertical

ENCLOSURE 38 litres

CONNECTORS 2 x Speakon

DIMENSIONS (W) 607mm x (H) 343mm x (D) 434mm

(W) 23.9ins x (H) 13.5ins x (D) 17.1ins

WEIGHT 25.7kg (57lbs)

SHIPPING DIMENSIONS (W) 710mm x (H) 420mm x (D) 510mm

(W) 28ins x (H) 16.5ins x (D) 20.1ins

SHIPPING WEIGHT 28kg (61.7lbs)

Martin Audio – LE SERIES

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CONTENTS

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LE400C

TYPE Active/passive monitor

BANDWIDTH 50Hz-18kHz ±3dB

DRIVERS 15” (385mm) dia. 3” (75mm) voice coil

1” (25mm) exit compression driver

RATED POWER LF/FR: 300W AES, 1200W peak.

HF: 60W AES, 240W peak

RECOMMENDED AMPLIFIER 500-700W into 4 ohms

SENSITIVITY LF/FR: 98dB / HF: 106dB

MAXIMUM SPL LF/FR: 121dB continuous,127dB peak

HF: 123dB continuous 129dB peak

IMPEDANCE LF/FR: 8 ohms nominal

HF: 8 ohms nominal

CROSSOVER 1200Hz

DISPERSION 40 degs horizontal, 70 degs vertical

ENCLOSURE 70 litres

CONNECTORS 2 x Speakon

DIMENSIONS (W) 660mm x (H) 470mm x (D) 554mm

(W) 26.0ins x (H) 18.5ins x (D) 21.8ins

WEIGHT 32.5kg (72lbs)

SHIPPING DIMENSIONS (W) 760mm x (H) 500mm x (D) 594mm

(W) 29.9ins x (H) 19.7ins x (D) 23.8ins

SHIPPING WEIGHT 38kg (83.8lbs)

Martin Audio – LE SERIES

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CONTENTS

GUIDES

LE700A

TYPE Two way active monitor

BANDWIDTH 60Hz-18kHz ±3dB

DRIVERS 15” (385mm) dia. 4” (100mm) voice coil

1.4” (35mm) exit compression driver

RATED POWER LF: 400W AES, 1600W peak

HF: 75W AES, 300W peak

RECOMMENDED AMPLIFIER 550-800W into 4 ohms

SENSITIVITY LF: 98dB / HF: 106dB

MAXIMUM SPL LF: 123dB continuous, 129dB peak

HF: 125dB continuous, 131 dB peak

IMPEDANCE LF: 8 ohms nominal

HF: 16 ohms nominal

CROSSOVER 1000Hz

DISPERSION 50-100 degs horizontal

(differential dispersion),

70 degs vertical

ENCLOSURE 80 litres

CONNECTORS 2 x Speakon

DIMENSIONS (W) 710mm x (H) 470mm x(D) 554mm

(W) 27.9ins x (H) 18.5ins x (D) 21.8ins

WEIGHT 44kg (97lbs)

SHIPPING DIMENSIONS (W) 820mm x (H) 520mm x (D) 570mm

(W) 32.3ins x (H) 20.5ins x (D) 22.4ins

SHIPPING WEIGHT 46kg (101.4lbs)

NOTES (LE Series)

Sensitivity measured in half-space conditions at 1 metre with 1 watt input,

using band limited pink noise.

SPL measured at 1 metre using band limited pink noise.

Finish: Black textured paint.

Protective grilles: Perforated steel black with 48% free air flow.

Cabinet construction: Birch ply.

Due to our policy of continuous improvement all specifications are subject

to change without notice.

Martin Audio – LE SERIES

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CONTENTS

GUIDES

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