Martin Audio EM120 Manuale utente

Martin Audio – EM SERIES: EM120

CONTENTS (ENGLISH) Page No

1 INTRODUCTION 2

2 UNPACKING 2

3 AMPLIFICATION 3

4 CONNECTING TO AN AMPLIFIER 3

5 SYSTEM CONFIGURATIONS 3

6 WARRANTY 5

7 TECHNICAL SPECIFICATIONS 6

MARTIN AUDIO

LONDON

The Martin Experience

CONTENTS

GUIDES

1 INTRODUCTION

Thank you for purchasing a Martin Audio EM120 loudspeaker system. The

EM120 is a sub-bass system designed to be used in conjunction with

compact full-range loudspeakers such as the EM15 and EM26 in situations

where extended low frequency output is required.

Ideally suited to background and foreground music reproduction, the

EM120 is ultra-compact and easily installed. An external crossover is not

necessary, but an EMX1A controller will increase the versatility of the

complete system, adding relative level control and driver protection.

The EM120 features a single, long excursion 10" (250mm) bass driver with

a 2.5" (65mm) voice coil.

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 be held

responsible for damage to any returned product through the use of non-

approved packaging.

Martin Audio – EM SERIES: EM120

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

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3 AMPLIFICATION

The EM120 is designed to be used with a professional power amplifier

capable of producing 400-500W into 4 ohms:

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.

4 CONNECTING TO AN AMPLIFIER

Connections are made via stripped wires to avoid the need for soldered

connectors. The EM120 enclosure is provided with a pair of 4mm screw

terminals.

The impedance of the EM120 is 8 ohms.

Note: It is important to maintain consistent polarity throughout i.e. Red to

Red, Black to Black.

5 SYSTEM CONFIGURATIONS

The basic system configuration for one EM120 and up to three EM15’s is

shown in Fig 1. Up to three EM15’s (each in 16 ohm configuration) are

wired in parallel with the input of the EM120, and driven from one channel

of the power amplifier. This arrangement presents a 3 ohm load to the

amplifier. Alternatively, one EM120 may be used with a single EM26,

presenting a 4 ohm load to the amplifier.

Martin Audio – EM SERIES: EM120

ENGLISH

CONTENTS

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(Fig 1)

To allow for the addition of further EM15’s and balance control between the

EM15’s and the EM120, a further power amplifier channel may be added to

the system as shown in Fig 2. The same signal is fed into both amplifiers,

one driving the EM15’s, the other driving the EM120.

(Fig 2)

Martin Audio – EM SERIES: EM120

ENGLISH

FROM PRE-AMP AMP

LEFT CHANNEL RIGHT CHANNEL

16 ohm 16 ohm 16 ohm 16 ohm 16 ohm 16 ohm

8 ohm 8 ohm

RIGHT CHANNELLEFT CHANNEL

16 ohm 16 ohm 16 ohm 16 ohm 16 ohm 16 ohm

8 ohm 8 ohm

FROM PRE-AMP FROM PRE-AMP

AMP

CONTENTS

GUIDES

An EMX1A controller may be used to further increase the flexibility of the

system (see Fig 3). With an EMX1A controller the relative levels can be

balanced in the controller. The EMX1A also provides signal limiting for

driver protection and has a 120Hz electronic crossover, removing signals

below this point from the EM15’s.

(Fig 3)

Note: Care must be taken, when connecting EM15’s in parallel, to ensure

that the total load impedance presented to the power amplifier will not

exceed the minimum specified by the amplifier manufacturer.

6 WARRANTY

Martin Audio EM120 loudspeakers 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 – EM SERIES: EM120

ENGLISH

16 ohm 16 ohm 16 ohm 16 ohm 16 ohm 16 ohm

8 ohm 8 ohm

RIGHT CHANNELLEFT CHANNEL

INPUTS

AMP

EMX1

CONTENTS

GUIDES

7 TECHNICAL SPECIFICATIONS

EM120

TYPE Ultra compact sub-bass system

FREQUENCY RESPONSE (1) 50Hz-180Hz ± 3db

RATED POWER (2) 200W AES, 800W peak

SENSITIVITY (3) 95dB 1Watt/1 metre

MAXIMUM SPL (4) 120dB continuous, 126dB peak

RECOMMENDED AMPLIFIER 400-500W (into 4 ohms)

NOMINAL IMPEDANCE 8 ohms

BASS 1 x (10") 250mm extended throw

ENCLOSURE 50 litres (1.56 cu foot), vented

CONNECTOR 1 x pair of binding posts

DIMENSIONS (W) 450mm x (H) 360mm x (D) 410mm

(W) 17.7ins x (H) 14.2ins x (D) 16.1ins

WEIGHT 17.5kg (38 lbs)

SHIPPING DIMENSIONS (W) 480mm x (H) 390mm x (D) 450mm

(W) 18.9ins x (H) 15.4ins x (D) 17.7ins

SHIPPING WEIGHT 19kg (41 lbs)

Notes

1. Measured on-axis in half space at 2 metres, then referred to 1 metre.

2. AES Standard ANSI S4.26-1984.

3. Measured in half space conditions at 2 metres with 1 watt input, using band limited pink noise,

then referred to 1 metre.

4. Measured in half space conditions at 2 metres using band limited pink noise, then

referred to 1 metre.

Due to our policy of continuous improvement all specifications are subject

to change without notice.

Martin Audio – EM SERIES: EM120

ENGLISH

CONTENTS

GUIDES

EM Series EM120

Century Point, Halifax Road, Cressex Business Park, High Wycombe, Buckinghamshire HP12 3SL, England.

Telephone: +44 (0)1494 535312 Facsimile: +44 (0)1494 438669

Web: www.martin-audio.com E-mail: [email protected]

The Martin Experience

MARTIN AUDIO

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MARTIN AUDIO

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The Martin Experience

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EM Series EM120

User’s Guide

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