EM Acoustics EMS-121X Manual de usuario

EMS-121X User Manual

www.emacoustics.co.uk

EMS-121X Fullrange Passive Loudspeaker

User Manual –v1.0

EM Acoustics Loudspeakers

Building 74, Dunsfold Park

Cranleigh, Surrey

GU6 8TB, UK

Phone +44 (0) 1483 266520

Fax +44 (0) 1483 275619

www.emacoustics.co.uk

_________________________________________________________________________________________

EMS-121X User Manual

www.emacoustics.co.uk

CONTENTS

Introduction

Thank you ...……………………………………………………………………………………………………………………………. 3

Unpacking ……………………………………………………………………………………………………………………………….. 3

Declaration of Conformity …………………….…………………………………………………………………………………… 3

Product Overview

EMS-121X passive two-way enclosure ..........……………………………………………………………………………… 4

System Set-up

Safety Considerations………………………………………………………………………………………………………………… 5

Cabling & Amplifier selection ……………………………………………………………………………………………………… 6

Protective DSP Settings ................................................................................................................. 7

Mounting & Rigging Options

Rigging Hardware & Accessories ………………………………………………………………………………………………… 8

Permanent Installations …………………………………………………………………………………………………………….. 8

Flying Yoke Use...............……………………………….…………………………………………………………………………. 9

Use with Omnimount & Powerdrive hardware ................................................................................. 10

Maintenance

EMS-121X Drive Unit Service ……………………………………………………………………………………………………….11

Warranty ……………………………………………………………………………………………………………………………………………. 12

Appendix A –Technical Specifications …………………………………………………………………………………………………… 13

EMS-121X User Manual

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INTRODUCTION

Thank you

Thank you for purchasing a product from the acclaimed EMS Series from EM Acoustics. The EMS Series products

have been carefully designed and rigorously tested to ensure years of flawless operation and unprecedented sonic

quality. Flexibility is the key factor with EMS products, and consequently they are at home within a wide variety of

applications from live and portable applications, through to cafes, bars, nightclubs, theatres and conference

centres.

Please ensure that you read this manual carefully before use, and that you keep it to hand should you need it for

further reference. Furthermore, should you have any difficulties please do not hesitate in contacting your EM

Acoustics dealer, or email info@emacoustics.co.uk for further assistance.

Unpacking

Every EM Acoustics product is built to the highest standard and thoroughly tested before it leaves our factory.

After unpacking your loudspeaker, please inspect it carefully for any signs of transit damage. If such damage is

found, please notify the carrier at once to instigate a claim. It is suggested that you retain all packaging for future

re-shipment.

DECLARATION OF CONFORMITY

The products contained within this manual conform to the requirements of the EMC

Directive 89/336/EEC, amended by 92/31/EEC and to 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

RECYCLING

This product and its packaging constitute the applicable product according to the WEEE directive.

Please ensure that at the end of the working life of this product, it is disposed of sensibly in

accordance with local and national recycling regulations. The packaging supplied with this product

is recyclable. Please retain all packaging, however if disposing of this packaging please ensure

that you comply with local recycling regulations. These products also all comply to the RoHS

Directive 2002/95/EC.

EMS-121X User Manual

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PRODUCT OVERVIEW

EMS-121X fullrange passive loudspeaker

The EMS-121X is a compact, versatile, fullrange loudspeaker product designed for a wide variety of compact and

discreet sound reinforcement applications. It features a high-power 12” (305mm) LF drive unit in a reflex

enclosure, and a 1.7” diaphragm, 1” (25mm) exit high frequency compression drive unit. These components are

matched by an internal passive crossover network for unprecedented sonic quality from a completely passive

enclosure.

The EMS-121X is suited to a wide variety of professional audio applications, from corporate and theatre use

through to small-medium scale front of house or nightclub use.

As with all EM Acoustics full-range products, no active controller or programmed EQ is required for correct

operation. For demanding applications, a 65Hz, 24dB/octave high pass filter is recommended to increase drive unit

headroom however this is not essential for normal operation –please see page 7 for further information.

The EMS-121X is supplied as standard in black or white, and is fitted with two Neutrik SpeakONTM NL4MPR

connectors. Custom colours, weather protection and specific connectors can also be supplied if required –please

contact your local EM Acoustics representative for more details.

EMS-121X User Manual

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SYSTEM SET-UP

Safety Considerations

Loudspeaker systems are potentially dangerous objects if used incorrectly. Please ensure that you read this

section fully, and contact EM Acoustics or your local dealer should you be in any doubt over correct operation

procedures.

Professional loudspeaker systems are capable of producing damage-inducing sound pressure levels, and hence

care should be taken when setting your system up, particularly when it comes to loudspeaker placement within a

venue. Damage to the ear can result from levels above 90dB under prolonged exposure.

Stand Mounting

The EMS-121X can be mounted on a standard 35mm loudspeaker stand. When mounting in this way, please

consider the following:

Ensure your stand height is locked off and the tripod legs are positioned so as to be stable.

Check the weight loading of your stands before attempting to mount the loudspeaker.

Do not stack a second loudspeaker on top of the stand-mounted one.

Ensure cables are run so as to leave enough slack to enable neat wiring, and thus reduce the risk of the

speaker being pulled over. Loose cables should be covered or taped down wherever possible to reduce trip

hazards.

If stands are being used outdoors, it may be necessary to add ballast to the base of the stand to prevent it

toppling over.

When using poles on top of subwoofer systems, please observe similar precautions.

Ground Stacking

Ensure that the floor or stage surface can withstand the weight of the system.

Wherever possible, avoid high stacks and use ratchet straps to secure loudspeakers together. Please also

remember that vibrations from subwoofer systems can shake other loudspeakers out of place, which may

present a toppling hazard. The use of ratchet straps and non-slip material is recommended to prevent this.

Rigging and Suspension

There are a variety of different methods for suspending your EMS-121X enclosures –please see the detailed

section on Page 8 for further information.

WARNING: The overhead suspension of loudspeakers is a very serious issue with potentially lethal

consequences should anything go wrong. Rigging should only be carried out by experienced

EMS-121X User Manual

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personnel following safe working practice. Should you be in any doubt whatsoever, please contact

your local dealer who will be able to refer you to a suitable rigging company.

Cabling and Amplifier Selection

The EMS-121X is designed to be used with professional power amplifiers providing the following power outputs:

EMS-121X 800W/channel into eight ohms

It is good practice to use an amplifier equal to the program power rating of the loudspeaker –so as to retain

sufficient headroom and good dynamic range. Care should be taken during operation to avoid amplifier clipping –

as this can cause serious damage to your loudspeakers. If in doubt, please contact your dealer who will be happy

to assist you in correct amplifier choice and setup.

Cabling

The EMS-121X is supplied as standard with Neutrik SpeakONTM NL4 connectors, wired pin 1+/1-. It is

recommended that the resistance of your cable is less than one tenth of the nominal system impedance. Given

below are the recommended maximum cable lengths for different cross-sections and impedances.

Conductor Cross Sectional Area Maximum Recommended Cable Length

4 ohms 8 ohms 16 ohms

1.0mm211m 22m 44m

1.5mm2 17m 34m 68m

2.0mm222m 44m 88m

2.5mm229m 58m 116m

4.0mm244m 88m 176m

6.0mm266m 132m 264m

Pins 2+/2- on the SpeakONTM connectors are wired together to allow link-through with 4-core cables.

A small power amplifier working too hard is more likely to damage a loudspeaker than a large power amplifier

working within its operating range!

EMS-121X User Manual

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Protective DSP Settings

The EMS-121X requires no DSP program to function correctly. However, excessive low frequency information will

cause the LF drive unit’s excursion to increase, which can result in damage to your loudspeaker.

The higher you raise the high pass filter on an EMS-121X, the more headroom and overall sound pressure level

output there is available. For most medium-to-high level applications, we would recommend a minimum of an

65Hz high pass filter with a 24dB/octave slope to sufficiently protect the loudspeaker. For higher SPL applications,

we would recommend raising this filter –we would stress that the higher the filter, the safer the loudspeaker will

be. If you are in any doubt over suitable settings for your EMS-121X, please don’t hesitate to contact EM Acoustics

or your local dealer for support and advice.

EMS-121X User Manual

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MOUNTING & RIGGING OPTIONS

Rigging Hardware & Accessories

The EMS-121X has a variety of options available for mounting and suspension.

The EMS-121X contains 12 M10 threaded fixing points around the enclosure, to enable suspension using forged

shoulder eyebolts (minimum thread length 25mm) or the optional FC-121v vertical or FC-121h horizontal flying

yokes. These fixings allow suspension in any orientation, with the unused points available for pull-back to obtain

the desired rigging angle or as a secondary safety point.

With any suspension method, a second anchor point should be used as a safety.

Under no circumstances should the mounting points of one enclosure be used to suspend another

enclosure below it. EM Acoustics are in no way responsible for the failure of incorrectly rigged

systems. This information relates specifically to the rigging techniques for the EMS-121X enclosures

only. If you are in any doubt about safe practices for rigging loudspeakers, please contact your local

EM Acoustics dealer who will be able to advise you.

Permanent Installations

Any installation (permanent or temporary) must be securely attached to the structure of the building using chain,

steel wire or web straps that are certified and load rated for the loudspeaker system. Consideration must be taken

when determining the loading on the structure to include loudspeakers and rigging hardware, and the appropriate

safety factor can then be decided upon. If you are in any doubt whatsoever, please contact your EM

Acoustics dealer who will be able to refer you to an experienced rigging company. A reputable rigging organisation

should also be able to advise on legislation regarding safety factors for suspended systems of this type.

Safety Considerations

When utilising any suspension method, a secondary safety must be used. For any suspension method, fit an M10

eyebolt to any of the unused rigging points. A safety steel can then be attached to this and connected to your

safety point. If you are in any doubt whatsoever about how to safely suspend your loudspeakers, do

not hesitate to contact your EM Acoustics representative who will be able to refer you to a qualified

rigging company for advice.

EMS-121X User Manual

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Attachment of the FC-121v vertical flying cradle

Using the supplied M10 hexagon head bolts, align the mounting holes

in the mounting bars with the mounting points on the sides of the

enclosure. Ensure that both the flat and spring washers are used –

the flat washer should be in contact with the cradle. Tighten the bolts

to ensure a solid fit. Once the desired angle of the loudspeaker is set,

tighten the knobs on the cradle to lock the position in place. The

bracket allows for complete rotation of the loudspeaker if required.

The points on the top of the flying cradle can be used for permanent

installations or to secure a hook clamp. Ensure that an M10 eyebolt is

secured to a rear or top point on the EMS-121X enclosure to use as a

secondary safety.

Attachment of the FC-121h horizontal flying cradle

Using the supplied M10 hexagon head bolts, align the

mounting holes in the end mounts of the yoke with the

mounting points on the top and the bottom of the

enclosure. Ensure that both the flat and spring washers

are used –the flat washer should be in contact with the

cradle. Tighten the bolts to ensure a solid fit. Once the

desired angle of the loudspeaker is set, tighten the knobs

on the cradle to lock the position in place. The bracket

allows for complete rotation of the loudspeaker if required.

The points on the top of the flying cradle can be used for

permanent installations or to secure a hook clamp. Ensure

that an M10 eyebolt is secured to a rear point on the EMS-

121X enclosure to use as a secondary safety.

Assembly of clusters using the DFB-121 flyplate set

Using the supplied M10 hexagon head bolts, bolt through the DFB-121

plate into the enclosure. Ensure that both the flat and spring washers

are used –the flat washer should be in contact with the plate. Once the

desired angles of the loudspeakers are set, tighten the bolts to lock in

place. Then turn the cluster over and repeat the process on the bottom.

Use the rear points on the EMS-121X enclosures, or the M10 holes on

the DFB plates to use as a secondary safety.

EMS-121X User Manual

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Attachment of OmnimountTM or PowerdriveTM Installation Brackets

It is strongly suggested that you position your loudspeakers, then mark & drill the holes in the mounting walls

before you attach the bracket to the loudspeaker, as it is much easier to check positioning and fit of the holes

without the weight of the loudspeaker.

The EMS-121X is designed to work with OmniMountTM Series 60 or PowerDriveTM Series 100

products.

Lie the enclosure on its front and remove the four M6 countersunk points on the rear of the enclosure. Position

the loudspeaker-side of the bracket as required, reinstate the bolts and retighten. The bracket and EMS-121X can

now be mounted using the holes you have pre-drilled.

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