Martin Audio EM Series User manual

MARTIN AUDIO

LONDON

The Martin Experience

ENGLISH

EM Series EM15/EM150

User’s Guide

Martin Audio – EM SERIES

CONTENTS (ENGLISH) Page No

1 INTRODUCTION 2

2 UNPACKING 2

3 EM15 IMPEDANCE 3

4 SAFETY FIRST 4

4.1 Rigging and suspension 4

5 AMPLIFICATION 4

6 CONNECTING TO AN AMPLIFIER 5

7 SYSTEM CONFIGURATIONS 5

8 WARRANTY 7

9 TECHNICAL SPECIFICATIONS 8

MARTIN AUDIO

LONDON

The Martin Experience

1 INTRODUCTION

Thank you for purchasing a Martin Audio EM Series loudspeaker system.

The EM15 is a miniature trapezoid full-range loudspeaker featuring twin

5"(125mm) drivers in a unique two-way configuration utilising patented

ICT™ (Inductively Coupled Transducer) technology. The EM150 is a twin

10"(250mm) driver sub-bass system designed to be used to extend the low

frequency performance of the EM15. It can also be used with larger EM

Series enclosures such as the EM26.

Ideally suited to background and foreground music reproduction, the EM15

and EM150 are 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.

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

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

3 EM15 IMPEDANCE

The EM15 can be configured as either a 4 ohm or 16 ohm loudspeaker.

The 16 ohm configuration allows up to 4 x EM15’s to be run in parallel from

a single amplifier channel. The EM15 is normally supplied from the factory

in the 4 ohm configuration. To convert it to 16 ohms, follow the procedure

below.

Fig 1 FRONT BACK

1. Remove terminal panel from rear of cabinet (4 pozi screws)

2. Remove red and black wires from the twin terminal, connect to each end

of the insulated terminal block.

3. Replace terminal panel.

Martin Audio – EM SERIES

ENGLISH

INPUT

Terminal panel

Twin Terminal

Insulated terminal

block

4 ohm

16 ohm

RED

BROWN

BLACK

BLUE

RED

BROWN BLUE

BLACK

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 EM 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.

4.1 Rigging and suspension

WARNING: Suspending the system should only be done by qualified

personnel following safe rigging practices. Secure fixings to the

building structure are vital. Seek help from architects, structural

engineers or other specialists if in any doubt.

5 AMPLIFICATION

The EM15 and EM150 are designed to be used with professional power

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

EM15 4 ohm 50-100W

EM15 16 ohm 200-400W

EM150 400-500W

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 – EM SERIES

ENGLISH

6 CONNECTING TO AN AMPLIFIER

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

connectors. The EM15 is provided with two spring-loaded terminals on the

rear of the enclosure and the EM150 is provided with two pairs of 4mm

screw terminals – a pair for each 10"(250mm) driver.

For mono EM150 operation these should be connected together externally

in parallel: left Red (+) to right Red (+), left Black (-) to right Black (-). The

paralleled mono impedance is 4 ohms. For stereo operation, separate

connections should be made to the EM150’s left and right terminals. The

impedance in this case is 8 ohms left and 8 ohms right.

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

Red, Black to Black.

7 SYSTEM CONFIGURATIONS

The basic system configuration for one EM150 and up to six EM15’s is

shown in Fig 2. Up to three EM15’s (each in 16 ohm configuration) are

wired in parallel with the respective left and right inputs of the EM150, and

driven from the left and right channels of the power amplifier. This

arrangement presents a 3 ohm load to each amplifier channel. Alternatively,

one EM150 may be used with a pair of EM26’s, presenting a 4 ohm load to

the amplifier.

Fig 2

Martin Audio – EM SERIES

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

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

EM15’s and the EM150, a further power amplifier may be added to the

system as shown in Fig 3. The same signal is fed into both amplifiers, one

driving the EM15’s, the other driving the EM150.

Fig 3

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

system (see Fig 4). 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 4

Martin Audio – EM SERIES

ENGLISH

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

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

8 ohm 8 ohm RIGHT CHANNEL

LEFT CHANNEL

INPUTS

AMP

EMX1

For larger systems, the EM150 drivers can be wired externally to give a 4

ohm mono sub. Two EM150’s can now be used with an increased number of

EM15’s (see Fig 5).

Fig 5

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.

8 WARRANTY

Martin Audio EM 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 – EM SERIES

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INPUTS

AMP AMP

16 ohm 16 ohm 16 ohm

4 ohm 4 ohm RIGHT CHANNEL

LEFT CHANNEL

EMX1

9 TECHNICAL SPECIFICATIONS

EM15

TYPE Ultra compact, two-way ICT™

FREQUENCY RESPONSE 120Hz-20kHz ±3dB

RATED POWER 75W AES, 300W peak

SENSITIVITY 91dB

MAXIMUM SPL 108dB continuous, 114dB peak

RECOMMENDED AMPLIFIER 50-100W (into 4 ohms)

DISPERSION 80 degs horizontal x 80 degs vertical

NOMINAL IMPEDANCE 4 ohms (16 ohms optional/user

configurable)

BASS 5” (125mm)

HIGH FREQUENCY 5” (125mm) ICT™

ENCLOSURE 5 litres, rear vented

CONNECTOR Spring-loaded

FITTINGS M4 inserts for Omnimount 50

DIMENSIONS (W) 172mm x (H) 282mm x (D) 172mm

(W) 6.8ins x (H) 11ins x (D) 6.8ins

WEIGHT 5kg (11lbs)

SHIPPING DIMENSIONS (W) 390mm x (H) 370mm x (D) 200mm

(Packed in pairs) (W) 15.4ins x (H) 14.5ins x (D) 7.9ins

SHIPPING WEIGHT 9kg (19.8lbs)

(Packed in pairs)

Martin Audio – EM SERIES

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EM150

TYPE Ultra compact sub-bass system

FREQUENCY RESPONSE 45Hz-200Hz ± 3db

RATED POWER 400W AES, 1600W peak

(2 x 200W AES, 800W peak per driver)

SENSITIVITY 98dB

MAXIMUM SPL 123dB continuous, 129dB peak

RECOMMENDED AMPLIFIER 400-500W (into 4 ohms)

NOMINAL IMPEDANCE 2 x 8 ohms nominal stereo,

4 ohms nominal mono

BASS 2 x 250mm (10") extended throw

ENCLOSURE 91 litres, vented

CONNECTOR 2 x spring-loaded

DIMENSIONS (W) 790mm x (H) 360mm x (D) 410mm

(W) 31.1ins x (H) 14.2ins x (D) 16.1ins

WEIGHT 31kg (68lbs)

SHIPPING DIMENSIONS (W) 950mm x (H) 390mm x (D) 450mm

(W) 37.4ins x (H) 15.4ins x (D) 17.7ins

SHIPPING WEIGHT 34kg (75lbs)

NOTES (EM 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: Textured grey green paint.

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

Due to our policy of continuous improvement all specifications are subject

to change without notice.

Martin Audio – EM SERIES

ENGLISH

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