MartinLogan ElectroMotion ESL X Manuel utilisateur

Marque: MartinLogan

Modèle: ElectroMotion ESL X

Taper: Manuel utilisateur

user’s manual

The lightning bolt flash with arrowhead

symbol, within an equilateral triangle,

is intended to alert the user to the

presence of potentially “dangerous voltage” within the

product’s enclosure that may be sufficient to constitute

a risk of electric shock.

The exclamation point within an

equilateral triangle is intended to alert

the user to the presence of important

operating and maintenance (servicing) instructions in

the literature accompanying the appliance.

In accordance with the European Union

WEEE (Waste Electrical and Electronic

Equipment) directive effective August 13,

2005, we would like to notify you that

this product may contain regulated materials which

upon disposal, according to the WEEE directive,

require special reuse and recycling processing.

For this reason Martin Logan has arranged with our

distributors in European Union member nations to

collect and recycle this product at no cost to you.

To find your local distributor contact the dealer from whom

you purchased this product, email [email protected]

or visit the distributor locator at www.martinlogan.com.

Please note, only this product itself falls under the

WEEE directive. When disposing of packaging and

other related shipping materials we encourage you to

recycle these items through the normal channels.

Installation in Brief ..................... 4

Introduction .......................... 5

Connections .........................6

Low-Voltage (DC) Power Connection .......6

Speaker Level Conneciton ..............6

Jumper Clips .......................7

Single Wire Connection ...............7

Bi-wire Connection ..................7

Passive Bi-amplification ................7

Active Bi-amplification ................8

Placement & Room Acoustics .............8

Listening Position ....................8

The Wall Behind the Listener ............8

The Wall Behind the Speakers ..........8

The Side Walls ....................8

Experimentation ....................9

Final Placement ...................11

The Extra “Tweak” .................11

Room Acoustics ......................13

Your Room .......................13

Terminology ......................13

Rules of Thumb ...................13

Dipolar Speakers and Your Room ........14

Solid Footing .....................14

Dispersion Interactions ................. 15

Controlled Horizontal Dispersion ........15

Controlled Vertical Dispersion ..........15

Three Major Types of Dispersion ........15

Home Theater .......................16

Electrostatic Advantages ...............17

MartinLogan Exclusives ................18

Full Range Operation ................18

CLS™ (Curvilinear Line Source) .........19

XStat Transducer ...................20

MicroPerf Stator ...................20

Vacuum Bonding ...................20

AirFrame™ Technology ..............20

Electrostatic Loudspeaker History .........20

Frequently Asked Questions .............23

Troubleshooting ...................... 25

General Information ..................26

Warranty and Registration ............26

Serial Number ....................26

Service .........................26

Specifications .......................27

Glossary of Audio Terms ...............27

Dimensional Drawings .................30

WARNING! Do not use your EM-ESL

X loudspeakers outside of the country

of original sale—voltage requirements

vary by country. Improper voltage can cause

damage that will be potentially expensive to repair.

The EM-ESL X is shipped to authorized MartinLogan

distributors with the correct power supply for use

in the country of intended sale. A list of authorized

distributors can be accessed at www.martinlogan.

com or by e-mailing info@martinlogan.

Serial Number:_____________________________

Record your serial number here for easy reference. You will need this information when filling out your

warranty registration. The serial number is located near the binding posts and on the product carton.

x 1

We know you are eager to hear your new

ElectroMotion ESL X (EM-ESL X) speakers, so this

section is provided to allow fast and easy set up.

Once you have them operational, please take the

time to read, in depth, the rest of the information in

this manual. It will give you perspective on how to

attain the greatest possible performance from this

most exacting transducer.

If you should experience any difficulties in the setup

or operation of your EM-ESL X speakers, please

refer to the Room Acoustics, Placement or Operation

sections of this manual. Should you encounter a

persistent problem that cannot be resolved, please

contact your authorized MartinLogan dealer. They

will provide you with the appropriate technical anal-

ysis to alleviate the situation.

WARNING!

• Hazardous voltages exist

inside—do not remove cover.

• Refer servicing to a qualified

technician.

• To prevent fire or shock hazard, do not

expose this module to moisture.

• Turn amplifier off and unplug speaker

should any abnormal conditions occur.

• Turn amplifier off before making or

breaking any signal connections!

• Do not operate if there is any visual

damage to the electrostatic panel element.

• Do not drive speaker beyond its rated power.

• The power cord should not be installed,

removed, or left detached from the speaker

while the other end is connected to an AC

power source.

• No candles or other sources of open flame

should be placed on the speaker.

• No liquids either in glasses or vases should

be placed on speaker.

• Speaker should not be exposed to dripping

or splashing liquids.

• The terminals marked with the lightning bolt

symbol should be connected by an instructed

person or by way of ready made terminals.

Step 1: Unpacking

Remove your new EM-ESL X speakers from their

packaging.

Step 2: Placement

Place each EM-ESL X at least two feet from the

back wall and angle them slightly toward your

listening area. This is a good place to start. Please

see the Placement section of this manual for more

details.

Step 3: Power Connection (see warning)

Your EM-ESL X speakers require power to energize

their electrostatic cells. Using the power cords

provided, plug them in first to the power receptacle

on the rear panel of the speaker, making sure that

you have made a firm connection, and then to a

wall outlet. Please see Low-Voltage (DC) Power

Connection (page 6) for more details.

InstallatIon In BrIef

WARNING! Do not use your EM-ESL X loudspeakers outside of the country of

original sale—voltage requirements vary by country. Improper voltage can cause

damage that will be potentially expensive to repair. The EM-ESL X is shipped to

authorized MartinLogan distributors with the correct power supply for use in the

country of intended sale. A list of authorized distributors can be accessed at www.

martinlogan.com or by emailing [email protected].

Step 4: Signal Connection

Use the best speaker cables you can. Higher

quality cables, available from your specialty

dealer, are recommended and will give you

superior performance.

Attach your speaker cables to the signal input

section on the rear panel. Be consistent when

connecting speaker leads to the terminals on the

back of the EM-ESL X. Take great care to assign

the same color to the (+) terminal on both the left

and right channels. If bass is nonexistent and you

cannot discern a tight, coherent image, you may

need to reverse the (+) and (–) leads on one side

to bring the system into proper polarity.

For detailed setup instructions, please turn to the

Speaker Level Connection section (page 6) of this

manual for more details.

Step 5: Listen and Enjoy

Now, you may turn on your system and enjoy!

Congratulations! You have invested in one of the

world’s premier speaker systems.

The ElectroMotion ESL X (EM-ESL X) represents

an advanced combination of sonic technologies

establishing an unprecedented direction for

audiophile design. The result of years of research,

the new EM-ESL X hybrid electrostatic loudspeaker

delivers new standards for efficiency, dynamics

and precision in a floor standing loudspeaker.

Housed within a radical, ultra-rigid extruded

aluminum and composite AirFrame™, the EM-ESL

X’s CLS XStat™ transducer builds upon the legacy

of MartinLogan’s electrostatic heritage with the

incorporation of advanced vacuum bonding and

MicroPerf stat panels, providing even greater

efficiency and precision. The integration electrical

interface technology developed by MartinLogan’s

CLX engineering team extends effortless dynamics

and purity, resulting in even higher sonic standards

of efficiency and precision.

Featuring an advanced crossover topology,

MartinLogan carefully builds each EM-ESL X

crossover utilizing precision components to

flawlessly preserve sonic subtleties while effortlessly

handling the broadest range of dynamics

contained within even the most demanding sonic

source.

The materials in your new EM-ESL X speakers are

of the highest quality and will provide years of

enduring enjoyment and deepening respect. The

cabinetry is constructed from the highest quality

composite material for acoustical integrity.

Through rigorous testing, the curvilinear electrostatic

panel has proven itself to be one of the most

durable and reliable transducers available today.

Fabricated from a custom tool punched high-grade

steel, the patented panel is then coated with a

special polymer that is applied via a proprietary

electrostatic bonding process. This panel assembly

houses a membrane just 0.0005 of an inch thick.

The other sections of your User’s Manual explain

in detail the operation of your EM-ESL X speakers

and the philosophy applied to their design. A clear

understanding of your speakers will insure that you

obtain maximum performance and pleasure from

this most exacting transducer. It has been designed

and constructed to give you years of trouble-free

listening enjoyment.

IntroductIon

connectIons

LOW-VOLTAGE (DC) POWER CONNECTION

Your EM-ESL X speakers use external low-voltage

power supplies to energize their electrostatic pan-

els. For this reason the proper low-voltage power

supplies are provided. A power supply should be

firmly inserted into the ‘DC Power In’ receptacle on

the rear connection panel of each speaker, then

to any convenient AC wall outlet. Your EM-ESL X

speakers integrate a signal sensing circuit which will

switch the EM-ESL X off after a few minutes of no

music signal, and requires less than two seconds to

recharge the panels when a music signal is present.

Your EM-ESL X speakers are provided with a

power supply for the power service supplied in the

country of original consumer sale. The AC power

requirements applicable to a particular unit is

specified both on the packing carton and on the

DC power supply.

If you remove your EM-ESL X speakers from the

country of original sale, be certain that the AC

power supplied in any subsequent location is suit-

able before connecting the low-voltage power

supply. Substantially impaired performance or

severe damage may occur to a EM-ESL X speak-

er if operation is attempted from an incorrect AC

power source.

WARNING! The DC power

supply should not be installed,

removed, or left detached from

the speaker while connected to an

AC power source.

SPEAKER LEVEL CONNECTION

Use the best speaker cables you can. The length

and type of speaker cable used in your system will

have an audible effect. Under no circumstance

should a wire of gauge higher (thinner) than #16

be used. In general, the longer the length used,

the greater the necessity of a lower gauge, and

the lower the gauge, the better the sound, with

diminishing returns setting in around #8 to #12.

A variety of cables are available whose manufactur-

ers claim better performance than standard heavy

gauge wire. We have verified this in many cases,

and the improvements available are often more

noticeable than the differences between wires of dif-

ferent gauge. The effects of cables may be masked

if equipment is not of the highest quality.

Connections are done at the signal input section

on the rear electronics panel of the speaker. Use

spade connectors for optimum contact and ease

of installation. Hand tighten the binding posts, but

do not overtighten—do not use a tool to tighten the

binding posts.

Be consistent when connecting the speaker cables

to the signal input terminals. Take care to assign

the same color cable lead to the (+) terminal on

both the left and right channel speakers. If bass is

nonexistent and you cannot discern a tight, coher-

ent image, you may need to reverse the (+) and

(–) leads on one speaker to bring the system into

proper polarity.

Fig. 1

JUMPER CLIPS

In some countries federal law prohibits

MartinLogan from supplying jumper clips. If none

are found installed under your speakers binding

posts, please refer to ‘Bi-Wire Connection’ for con-

nection instructions.

SINGLE WIRE CONNECTION

Please take note of the jumper clips installed

under the binding posts. These clips attach the

high-frequency and low-frequency sections of the

crossover together. Leaving these in place, con-

nect the (+) wire from your amplifier to either red

(+)binding post and the (–) wire from your ampli-

fier to either black (–) binding post (Fig. 2).

WARNING! Only after jumper

clips are removed may you con-

nect individual runs of speaker

cable from your amplifiers to the

high-frequency and low-frequency

signal input binding posts. Damage

will occur to your amplifiers if the

jumper clips are not removed.

BI-WIRE CONNECTION

This connection method replaces the jumper clips

installed under the binding posts with individual

runs of speaker wire from your amplifier. This

doubles the signal carrying conductors from the

amplifier to the speaker, thus direct-coupling each

portion of the crossover to the amplifier.

To bi-wire you must first loosen the binding posts

and remove the jumper clips. Connect one set of

wires to the upper set of binding posts which con-

nect to the high-frequency drivers. Then connect

a second set of wires to the lower binding posts

which connect to the low-frequency drivers. Next,

connect both sets of wires to the appropriate termi-

nals on your amplifier. Please take care to connect

both (+) wires to the (+) amplifier terminals and

both (–) wires to the (–) amplifier terminals. This is

known as a parallel connection (Fig. 3.

PASSIVE BI-AMPLIFICATION

For those that desire ultimate performance, these

speakers may be passively bi-amplified using the

existing internal passive crossover elements.

Fig. 2: Single-wire connection. One channel shown.

Fig. 3: Bi-wire connection. One channel shown.

This method takes the bi-wiring concept one step

further. You will have a dedicated channel of

amplification directly connected to the high- and

low-frequency sections of the crossover. There

are two different methods for bi-amping with two

stereo amplifiers. The first and most common is

referred to as Horizontal Bi-amping. The second

method is referred to as Vertical Bi-amping. With

either method you may use two stereo amplifiers or

four mono amplifiers, or two mono amplifiers and

one stereo amplifier. Get the idea? With either

form of passive bi-amplification, your preamplifier

must have dual outputs. If your preamplifier is not

so equipped, you must either purchase or construct

a “Y” adapter.

Horizontal Passive Bi-Amplification

Horizontal bi-amping allows you to use two differ-

ent types, models or brands of amplifiers (i.e. tubes

on top, transistor on the bottom). However, we

recommend that you use two identical amplifiers

(i.e. same brand and model). If you must use two

different amplifiers, it is essential that they have the

same gain or that one of the two have adjustable

gain so that you can match their gain character-

istics. If the amplifiers of choice do not have the

same gain characteristics, then a sonic imbalance

will occur. With horizontal bi-amping, one ampli-

fier drives the high-frequency section of the speaker

while the second amplifier drives the low-frequency

section. To horizontally bi-amp your speakers you

must loosen the binding posts and remove the

jumper clips. Connect the low-frequency amplifier

to the lower set of binding posts of both speakers.

Connect the high-frequency amplifier to the upper

set of binding posts. Next, connect the left and

right preamplifier outputs to the appropriate left

and right inputs of both amplifiers (Fig. 4).

Vertical Passive Bi-Amplification

The very nature of vertical bi-amping dictates that

both amplifiers be identical. With vertical bi-amp-

ing, each of the stereo amplifiers is dedicated to

one speaker. For instance, the left channel of each

amplifier drives the low-frequency section while the

right channel drives the high-frequency section. To

vertically bi-amp your speakers you must loosen the

binding posts and remove the jumper clips from

Fig. 4: Horizontal bi-amplification connection.

One channel shown.

Fig. 5: Vertical bi-amplification connection.

One channel shown.

Placement

LISTENING POSITION

Your speakers should be placed approximately

two to three feet from the front wall, the wall in

front of the listening position, and about two feet

from the side walls. Your sitting distance should

be further than the distance between the speakers

themselves. You are trying to attain the impression

of good center imaging and stage width.

There is no exact distance between speakers

and listener, but there is a relationship. In long

rooms, naturally, that relationship changes. The

distance between the speakers will be far less

than the distance from you to the speaker system.

However, in a wide room, you will still find that

if the distance from the listener to the speakers

becomes smaller than the distance between the

speakers themselves, the image will no longer

focus in the center.

Now that you have positioned your speaker

system, spend time listening. Wait to make an

major changes in your initial setup for the next

few days as the speaker system itself will change

subtly in its sound. Over the first 72 hours of play

the actual tonal quality will change slightly with

deeper bass and more spacious highs resulting.

After a few days of listening you can begin to

make refinements and hear the differences.

THE WALL BEHIND THE LISTENER

Near-field reflections can also occur from your

back wall (the wall behind the listening position).

If your listening position is close to the back wall,

these reflections can cause problems and confuse

imaging quality. It is better for the wall behind you

to be absorptive than to be reflective. If you have a

hard back wall and your listening position is close

to it, experiment with devices that will absorb

information (i.e. wall hangings and possibly even

sound absorbing panels).

THE WALL BEHIND THE SPEAKERS

The front surface, the wall behind the speakers,

should not be extremely hard or soft. A pane

of glass will cause reflections, brightness and

confused imaging. Curtains, drapery and objects

such as bookshelves can be placed along the

wall to diffuse an overly reflective surface. A

standard sheet rock or textured wall is generally

an adequate surface if the rest of the room is not

too bright and hard. Walls can also be too soft.

If the entire front wall consists of heavy drapery,

your system can sound dull. You may hear muted

music with little ambience. Harder surfaces will

actually help in this case. The front surface ideally

should be one long wall without any doors or

openings. If you have openings, the reflection

and bass characteristics from each channel can

be different.

THE SIDE WALLS

A good rule of thumb is to have the side walls

as far away from the speaker sides as possible.

both speakers. Starting with one speaker, connect

the right channel to the lower binding posts and

the left channel to the upper binding posts. Repeat

the same procedure for the other speaker. Connect

the left preamplifier outputs to both inputs of the left

channel amplifier and the right preamplifier outputs

to both inputs of the right channel amplifier (Fig. 5).

ACTIVE BI-AMPLIFICATION

We do not recommend active bi-amplification. The

internal crossover can not be bypassed. This con-

nection method seriously degrades performance.

Fig. 6

However, MartinLogan’s unique controlled

dispersion electrostatic transducer inherently

minimizes side wall reflections—a position as

little as two feet from the side walls often proves

adequate. Sometimes, if the system is bright or the

imaging is not to your liking, and the side walls

are very near, try putting curtains or softening

material directly to the edge of each speaker. An

ideal side wall, however, is no side wall at all.

EXPERIMENTATION

Toe-in

Now you can begin to experiment. First begin

by toeing your speakers in towards the listening

area and then facing them straight into the room.

You will notice the tonal balance and imaging

changing. You will notice that as the speakers are

toed-out, the system becomes slightly brighter than

when toed-in. This design gives you the flexibility to

compensate for a soft or bright room.

Generally it is found that the ideal listening position

is with the speakers slightly toed-in so that you are

listening to the inner third of the curved transducer

section. A simple, yet effective method to achieve

proper toe involves sitting at the listening position,

holding a flashlight under your chin and pointing

it at each speaker. The reflection of the flashlight

should be within the inner third of the panel (see

figure 7).

Imaging

In their final location, your EM-ESL X’s can

have a stage width somewhat wider than the

speakers themselves. On well recorded music,

the instruments can extend beyond the edges of

each speaker (left and right), yet a vocalist should

appear directly in the middle. The size of the

instruments should be neither too large nor too

small, subject to the intent and results of each

unique audio recording.

Additionally, you should find good clues as to

stage depth. Make sure that the vertical alignment,

distance from the front wall, and toe-in is exactly

the same for both speakers. This will greatly

enhance the quality of your imaging.

Bass Response

Your bass response should neither be one note

nor should it be too heavy. It should extend to

the deepest organ passages and yet be tight

and well defined. Kick-drums should be tight and

percussive—string bass notes should be uniform

and consistent throughout the entirety of the run

without booming or thudding.

Tonal Balance

Voices should be natural and full and cymbals

should be detailed and articulate yet not bright

and piercing, pianos should have a nice transient

characteristic and deep tonal registers. This will give

you clues on how to get closer to these ideal virtues.

FINAL PLACEMENT

After the full break in period, obtaining good wall

treatments, and the proper toe-in angle, begin to

experiment with the distance from the wall behind

the speakers Move your speaker slightly forward

into the room. What happened to the bass

response? What happened to the imaging? If the

imaging is more open and spacious and the bass

response is tightened, that is a superior position.

Move the speakers back six inches from the initial

setup position and again listen to the imaging and

bass response. There will be a position where

you will have pinpoint imaging and good bass

response. That position is the point of the optimal

placement from the front wall.

Now experiment with placing the speakers farther

apart. As the speakers are positioned farther apart,

listen again, not so much for bass response but

for stage width and good pinpoint focusing. Your

ideal listening position and speaker position will

be determined by:

• Tightness and extension of bass response

• Width of the stage

• Pinpoint focusing of imaging

Once you have determined the best of all three

of these considerations, you will have your best

speaker location.

THE EXTRA “TWEAK”

This extra “tweak” may be useful when your

speakers are placed in a dedicated listening room.

Use the following procedure and measurements

for your speakers placement to see what can

happen to your system’s performance. These

formulas will help determine optimum placement

of your speakers to minimize standing waves.

1 Distance from the front wall (in front of the

listening position) to the center of the curvilinear

transducer: To determine distance from the front

wall, measure the ceiling height (inches) and

multiply the figure by 0.618 (i.e. ceiling height

(inches) x 0.618 = the distance from the front

wall to the center of the curvilinear transducer).

2 Distance from the side-walls to the center of the

curvilinear transducer: To determine distance

from the side walls, measure the width of

your room in inches and divide by 18. Next,

multiply the quotient by 5 (i.e. room width in

inches / 18 x 5 = the distance from the side-

walls to the center of the curvilinear transducer).

Fig. 7

YOUR ROOM

This is one of those areas that requires both a little

background to understand and some time and

experimentation to obtain the best performance

from your system.

Your room is actually a component and an important

part of your system. It can dramatically add to, or

subtract from, a great musical experience.

All sound is composed of waves. Each note

has its own wave size, with the lower bass

notes literally encompassing from 10’ feet to as

much as 40’ feet. Your room participates in this

wave experience like a three dimensional pool

with waves reflecting and becoming enhanced

depending on the size of the room and the types

of surfaces in the room. Remember, your audio

system can literally generate all of the information

required to recreate a musical event in time,

space, and tonal balance. Ideally, your room

should not contribute to that information. However,

every room does contribute to the sound to some

degree. Fortunately MartinLogan had designed the

EM-ESL X to minimize these anomalies.

TERMINOLOGY

Standing Waves

The parallel walls in your room will reinforce

certain notes to the point that they will sound louder

than the rest of the audio spectrum and cause “one

note bass”, “boomy bass” or “bloated bass”. For

instance, 100Hz represents a 10 feet wavelength.

Your room will reinforce that specific frequency if

one of the dominant dimensions is 10 feet. Large

objects in the room such as cabinetry or furniture

can help to minimize this potential problem. Some

serious “audiophiles” will literally build a special

room with no parallel walls just to help eliminate

this phenomenon.

Reflective Surfaces (near-field reflections)

The hard surfaces of your room, particularly if close

to your speaker system, will reflect some waves

back into the room over and over again, confusing

the clarity and imaging of your system. The smaller

sound waves are mostly affected here, and occur in

the mid and high frequencies. This is where voice

and frequencies as high as the cymbals occur.

Resonant Surfaces and Objects

All of the surfaces and objects in your room are

subject to the frequencies generated by your

system. Much like an instrument, they will vibrate

and “carry on” in syncopation with the music, and

contribute in a negative way to the music. Ringing,

boominess, and even brightness can occur simply

because they are “singing along” with your music.

Resonant Cavities

Small alcoves or closet type areas in your room can

be chambers that create their own “standing waves”

and can drum their own “one note” sounds.

Clap your hands. Can you hear an instant echo

respond back? You have near-field reflections.

Stomp your foot. Can you hear a “boom”? You

have standing waves or large panel resonances

such as a poorly supported wall. Put your head in a

small cavity area and talk loudly. Hear a booming?

You’ve just experienced a cavity resonance.

RULES OF THUMB

Hard vs. Soft Surfaces

If the front or back wall of your listening room

is soft, it might benefit you to have a hard or

reflective wall in opposition. The ceiling and floor

should follow the same basic guideline as well.

However, the side walls should be roughly the

same in order to deliver a focused image.

room acoustIcs

This rule suggests that a little reflection is good.

As a matter of fact, some rooms can be so “over

damped” with carpeting, drapes and sound

absorbers that the music system can sound dull and

lifeless. On the other hand, rooms can be so hard

that the system can sound like a gymnasium with

too much reflection and brightness. The point is

that balance is the optimum environment.

Breakup Objects

Objects with complex shapes, such as

bookshelves, cabinetry and multiple shaped walls

can help break up those sonic gremlins and diffuse

any dominant frequencies.

DIPOLAR SPEAKERS AND YOUR ROOM

MartinLogan electrostatic loudspeakers are known

as dipolar radiators. This means that they produce

sound from both their fronts and their backs.

Consequently, musical information is reflected by

the wall behind them and may arrive, either in or

out of step, with the information produced by the

front of the speaker.

The low frequencies can either be enhanced or

nulled by the position from the front wall. Your

EM-ESL X’s have been designed to be placed two

to three feet from the front wall (the wall in front

of the listening position) to obtain the best results;

however, your room may see things differently. So

listening to the difference of the bass response as a

result of the changes in distance from the front wall

can allow you to get the best combination of depth

of bass and tonal balance.

Now that you know about reflective surfaces and

resonant objects, you can see how the midrange

and high frequencies can be affected. The timing

of the initial wave as it radiates to your ears, and

then the reflected information as it arrives at your

ears later in time, can result in confusion of the

precious timing information that carries the clues

to imaging. Consequently the result is blurred

imaging and excessive brightness. Soft walls,

curtains, wall hangings, or sound dampeners (your

dealer can give you good information here) can

be effective if these negative conditions occur.

SOLID FOOTING

After living and experimenting with your EM-ESL

X speakers, you may want to expose the ETC

(energy transfer coupler) Spikes (see figure 8).

With the use of these spikes, the EM-ESL X will

become more firmly planted on the floor and,

consequently, bass will tighten and imaging will

become more coherent and detailed. It is best not

to use the spikes, however, until you are secure in

the positioning, as the spikes can damage the floor

if the speaker is moved.

Exposing the Spikes

Remove the rubber bumpers to expose the spikes

(see figure 6). If the speaker does not sit level loosen

one spike until level is achieved. Caution: Make

sure your hands and any cabling are clear of the

spikes. Do not slide speaker as spikes are sharp

and can damage your floor or carpet. Caution:

Walking the speaker may result in a broken spike.

Fig. 8

CONTROLLED HORIZONTAL DISPERSION

Your EM-ESL X’s launch a 30 degree horizontal

dispersion pattern. This horizontal dispersion field

gives a choice of good seats for the performance

while minimizing interactions with side walls (see

figure 13). Make sure both speakers stand exactly

at the same vertical angle, otherwise the image

can be skewed or poorly defined. The wave

launch of both speakers is extremely accurate in

both the time and spectral domain. Consequently,

small refined adjustments can result in noticeable

sonic improvements.

CONTROLLED VERTICAL DISPERSION

As you can see from the illustrations, your EM-ESL

X speakers project a controlled dispersion pattern

(see figure 14). Each EM-ESL X is a 34 inch line

source. This vertical dispersion profile minimizes

interactions with the floor and the ceiling.

THREE MAJOR TYPES OF DISPERSION

It is a known fact that as the sound wave becomes

progressively smaller than the transducer producing

it, the dispersion of that wave becomes more and

more narrow, or directional. This fact occurs as

long as the transducer is a flat surface. Large flat

panel speakers exhibit venetian blind effects due

to this phenomenon. This is one reason why many

manufacturers opt for small drivers (i.e. tweeters

and midrange) to approximate what is known as a

point source wave launch.

Historically, most attempts to achieve smooth dis-

persion from large flat panel transducers resulted

in trade-offs. After exhaustive testing of many differ-

ent methods, we conceived an elegantly simple, yet

intensely hand crafted process. By curving the radiat-

ing surface, we create the effect of a horizontal arc.

This allows the engineers at MartinLogan to control the

high frequency dispersion pattern of our transducers.

dIsPersIon InteractIons

Figure 9–10. As can be seen here,

point source concepts invite a great

deal of room interaction. While deliv-

ering good frequency response to a

large listening audience, imaging is

consequently confused and blurred.

Figure 11–12. Even though they

suffer from “venetian blind” effect,

angled multiple panel speakers can

deliver good imaging, but only to

specific spots in the listening area.

Figure 13–14. A controlled 30

degree cylindrical wave-front, a

MartinLogan exclusive, offers optimal

sound distribution with minimal room

interaction. The result is solid imaging

with a wide listening area.

Home tHeater

It had long been the practice of stereo buffs to

connect their television to a stereo system. The

advantage was the use of the larger speakers and

more powerful amplifier of the stereo system. Even

though the sound was greatly improved, it was still

mono and limited by the broadcast signal.

In the late 1970’s and early 1980’s two new

home movie formats became widely available to

the public: VCR and laser disc.

By 1985, both formats had developed into very

high quality audio/video sources. In fact, the sonic

performance of some video formats exceeded

audio-only formats. Now, with theater-quality

sound available at home, the only element missing

was the “surround sound” presentation found in

movie houses.

Fortunately, Dolby and DTS encoded DVD’s

emerged with the same surround sound

information encoded on home releases as the

theatrical release. Additionally, new high-

resolution home-viewing formats such as Blu-ray

as well as high-definition content provided via

cable or satellite have evolved which include multi-

channel encoded audio that is virtually master

tape quality. All that is required to retrieve this

information is a decoder and additional speakers

and amps to reproduce it.

Home theater is a complex purchase and we

recommend that you consult your local MartinLogan

dealer, as they are well versed in this subject.

Each piece of a surround system can be purchased

separately. Take your time and buy quality. No

one has ever complained that the movie was too

real. The following list and descriptions will give

you only a brief outline of the responsibilities and

demands placed on each speaker.

Front Left and Front Right

If these speakers will be the same two used for

your stereo playback, they should be of very high

quality and able to play loudly (over 102 dB) and

reproduce bass below 80 Hz.

Center Channel

This is the most important speaker in a home

theater system, as almost all of the dialogue and

a large portion of the front speaker information is

reproduced by the center channel. It is important

that the center speaker be extremely accurate and

mate well with the front speaker, and that it is

recommended for use as a center speaker. This is

not the place to cut corners.

Surround Speakers

We recommend (along with the film industry) that

the surround speakers play down to at least 80

Hz. Surround speakers contain the information that

makes it appear that planes are flying over your

Figure 15. MartinLogan peakers as front, center, and

surround channels, and MartinLogan subwoofers in the

front corners as the 0.1 (effects) channel.

head. Some may suggest that this is the place to

save money and purchase small, inexpensive

speakers. If you choose to do so, be prepared

to upgrade in the future as discrete multi-channel

digital encoding is proliferating rapidly and the

demands on surround speakers have increased.

Subwoofer

With any good surround system you will need high-

quality subwoofers (the .1 in a 5.1, 6.1, or 7.1

channel surround system). Most movie soundtracks

contain large amounts of bass information as part of

the special effects. Good subwoofers will provide a

foundation for the rest of the system.

electrostatIc advantages

How can sound be reproduced by something that

you are able to see through? Electrostatic energy

makes this possible.

Where the world of traditional loudspeaker

technology deals with cones, domes, diaphragms

and ribbons that are moved with magnetism, the

world of electrostatic loudspeakers deals with

charged electrons attracting and repelling each other.

To fully understand the electrostatic concept, some

background information will be helpful. Remember

when you learned in a science or physics class

that like charges repel each other and opposite

charges attract each other? Well, this principle is

the foundation of the electrostatic concept.

An electrostatic transducer consists of three pieces:

stators, the diaphragm and spacers (see figure

16). The diaphragm is what actually moves to

excite the air and create music. The stator’s job

is to remain stationary, hence the word stator,

and to provide a reference point for the moving

diaphragm. The spacers provide the diaphragm

with a fixed distance in which to move between

the stators.

As your amplifier sends music signals to an

electrostatic speaker, these signals are changed

into two high-voltage signals that are equal in

strength but opposite in polarity. These high

voltage signals are then applied to the stators.

Figure 16. Cut away view of an electrostatic

transducer. Notice the simplicity due to minimal

parts usage.

Figure 17. Cut away view of a typical moving

coil driver. Notice the complexity due to the high

number of parts.

martInlogan exclusIves

FULL RANGE OPERATION

Another significant advantage of MartinLogan’s

exclusive transducer technology reveals itself

when you look at examples of other loudspeaker

products on the market today. The EM-ESL X uses

no crossover networks above 400 Hz because

they are not needed. The EM-ESL X consists

of a single, seamless electrostatic membrane

reproducing all frequencies above 400 Hz

simultaneously. How is this possible?

First we must understand that music is not composed

of separate high, mid and low frequency pieces.

In fact, music is comprised of a single complex

waveform with all frequencies interacting

simultaneously.

The electrostatic transducer of the EM-ESL X

essentially acts as an exact opposite of the

microphones used to record the original event. A

microphone, which is a single working element,

transforms acoustic energy into an electrical signal

that can be amplified or preserved by some type

of storage media. The EM-ESL X’s electrostatic

transducer transforms electrical energy from your

amplifier back into acoustical energy.

Due to the limitations of electromagnetic drivers,

no single unit can reproduce the full range

of frequencies. Instead, these drivers must be

designed to operate within a narrow, fixed

bandwidth of the frequency range, and then

combined electrically so that the sum of the parts

equals the total signal. While nice in theory, we

must deal with real-world conditions.

In order to use multiple drivers, a crossover

network is enlisted to attempt a division of the

The resulting electrostatic field, created by the

opposing high voltage on the stators, works

simultaneously with and against the diaphragm,

consequently moving it back and forth, producing

music. This technique is known as push-pull

operation and is a major contributor to the sonic

purity of the electrostatic concept due to its

exceptional linearity and low distortion.

Since the diaphragm of an electrostatic speaker

is uniformly driven over its entire area, it can be

extremely light and flexible. This allows it to be

very responsive to transients, thus perfectly tracing

the music signal. As a result, great delicacy,

nuance and clarity is possible. When you look at

the problems of traditional electromagnetic drivers,

you can easily see why this is so beneficial. The

cones and domes which are used in traditional

electromagnetic drivers cannot be driven uniformly

because of their design. Cones are driven only

at the apex. Domes are driven at their perimeter.

As a result, the rest of the cone or dome is just

“along for the ride”. The very concept of these

drivers requires that the cone or dome be perfectly

rigid, damped and massless. Unfortunately, these

conditions are not available in our world today.

To make these cones and domes move, all

electromagnetic drivers must use voice coils wound

on formers, spider assemblies, and surrounds to

keep the cone or dome in position (see figure 17).

These pieces, when combined with the high mass

of the cone or dome materials used, make it an

extremely complex unit with many weaknesses and

potential for failure. These faults contribute to the

high distortion products found in these drivers and

is a tremendous disadvantage when you are trying

to change motion as quickly and as accurately as

a loudspeaker must (40,000 times per second!).

MartinLogan ElectroMotion ESL X Conventional Loudspeaker

crossover point (2,000–5,000 Hz)

crossover point (100–500 Hz)

Critical Zone: 400 Hz–20 kHz

crossover point (400 Hz)

Woofer

EM-

Panel

EXL

Woofer

Midrange

Tweeter

Figure 18. This diagram illustrates how a conventional

speaker system must use multiple crossover networks that

have negative effects on the musical performance.

complex musical signal into the separate pieces

(usually highs, mids, and lows) that each specific

driver was designed to handle. Unfortunately,

due to the phase relationships that occur within

all crossover networks and during the acoustical

recombination process, nonlinearities and severe

degradation of the music signal take place in the

ear’s most critical zone (see figure 18).

The EM-ESL X’s electrostatic transducer can single-

handedly reproduce all frequencies above 400

Hz simultaneously. You have in one transducer the

ability to handle in elegant simplicity the critical

frequencies above 400 Hz.

The crossover phase aberrations that are

associated with traditional tweeter, midrange,

and woofer systems are eliminated. The result is

a dramatic improvement in imaging and staging

performance due to the minutely accurate phase

relationship of the full-range panel wave launch.

CLS™ (CURVILINEAR LINE SOURCE)

Since the beginning of audio, achieving smooth

dispersion has been a problem for all designers.

Large panel transducers present unique challenge

because the larger the panel, the more direc-

tional the dispersion pattern becomes.

Wide range electrostats have long been one of

the most problematic transducers because they

attain their full range capabilities via a large

surface area. It looked as if they were in direct

conflict to smooth dispersion and almost every

attempt to correct this resulted in either poor dis-

persion or a serious compromise in sound quality.

After extensive research, MartinLogan engineers

discovered an elegantly simple solution to

achieve a smooth pattern of dispersion without

degrading sound quality. By curving the horizontal

plane of the electrostatic transducer, a controlled

horizontal dispersion pattern could be achieved,

yet the purity of the almost massless electrostatic

diaphragm remained uncompromised. After

creating this technology, MartinLogan developed

the production capability to bring it out of the

laboratory and into the market place. You will

find this proprietary MartinLogan technology used

in all of our electrostatic products. It is one of

the many reasons behind our reputation for high

quality sound with practical usability. This is also

why you see the unique “see through” cylindrical

shape of MartinLogan products.

In the late 1800’s, any loudspeaker was

considered exotic. Today, most of us take the

wonders of sound reproduction for granted.

It was 1880 before Thomas Edison had invented

the first phonograph. This was a horn-loaded

diaphragm that was excited by a playback

stylus. In 1898, Sir Oliver Lodge invented a

cone loudspeaker, which he referred to as a

“bellowing telephone”, that was very similar to

the conventional cone loudspeaker drivers that we

know today. However, Lodge had no intention for

his device to reproduce music because in 1898

there was no way to amplify an electrical signal!

As a result, his speaker had nothing to offer over

the acoustical gramophones of the period. It was

not until 1906 that Dr. Lee DeForrest invented the

triode vacuum tube. Before this, an electrical signal

could not be amplified. The loudspeaker, as we

know it today, should have ensued then, but it did

not. Amazingly, it was almost twenty years before

this would occur.

In 1921, the electrically cut phonograph record

became a reality. This method of recording was

far superior to the mechanically cut record and

possessed almost 30 dB of dynamic range.

The acoustical gramophone couldn’t begin to

reproduce all of the information on this new disc.

As a result, further developments in loudspeakers

were needed to cope with this amazing new

recording medium.

By 1923, the decision to develop a complete

electrostatIc HIstory

XSTAT™ TRANSDUCER

XStat™ transducers incorporate a myriad of

technology and design innovations including

CLS™, MicroPerf, Generation 2 Diaphragms,

ClearSpars™, and Vacuum Bonding.

MICROPERF STATOR

Sleek. Compact. MicroPerf stator technology,

featured in EM-ESL X’s electrostatic transducer,

reveals more open playable area in each panel,

offering increased performance from even more

compact stat panels. It is significant to note that the

electrostatic transducer in the radical new EM-ESL

X loudspeaker supports the bandwidth and

dynamics associated with traditional electrostatic

panels nearly twice its size.

VACUUM BONDING

To achieve the power, precision, and strength of

the electrostatic transducer, two insulated high-

purity carbon steel stators along with a proprietary

plasma bonded diaphragm and ClearSpar™

spacers are fused into a curved geometry with

an aerospace adhesive whose strength exceeds

that of welding. Our proprietary Vacuum Bonding

process guarantees uniform diaphragm tensioning

and extremely precise construction tolerances,

resulting in unequivocal precision, linearity and

efficiency.

AIRFRAME™ TECHNOLOGY

Ultra-rigid extruded aerospace grade aluminum

alloy AirFrame™ technology rigidifies and secures

the electrostatic panel to the woofer cabinet while

at the same time providing sonic and electrical

isolation. Advanced AirFrame™ technology

maximizes the electrostatic panels playable

surface area and dipole dispersion pattern while

minimizing potentially acoustically destructive

intermodulated distortion caused by spurious

vibrations and resonance. The result? Ultimate

imaging capability, low-level detail resolution,

improved efficiency and overall accuracy.

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MartinLogan ElectroMotion ESL X Manuel utilisateur

Marque: MartinLogan

Modèle: ElectroMotion ESL X

Taper: Manuel utilisateur

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