User`s manual

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Logos User's Manual

Martin-Logan Exclusives

Vapor Deposited FilmVapor Deposited Film

Vapor Deposited Film

The diaphragm material used in all Martin-Logan

speakers employs an extremely sophisticated vapor

deposited conductive polymer membrane. A

proprietary conductive compound is vaporized then

electrostatically driven into the surface of the

polymer film in a vacuum chamber. This process

allows an optically transparent membrane, adds no

mass to the diaphragm and is extremely uniform in its

surface resistivity characteristics. This uniform surface

resistivity controls the electrostatic charge on the

diaphragm surface and regulates its migration. As a

result, no discharging or “arcing” can occur.

Transducer IntegrityTransducer Integrity

Transducer Integrity

All Martin-Logan transducers begin with two pieces

of high grade, cold rolled steel. These steel pieces

are then custom perforated and insulated with an

exotic composite coating. This proprietary coating

insulates the stator to 3 times its actual needed

working voltage and gives the Logos a wide margin

of safe operation. In addition to the electrical

insulation properties, this coating also provides the

Logos with a durable, attractive finish that dampens

the steel to prevent ringing. The finished metal plates

are curved into a 30 degree arc. Placed between

them is our exclusive vapor deposited diaphragm

and spacers. This assembly is then bonded together

with aerospace adhesives whose strength is so great

that it is commonly used as an alternative to welding.

The result of these advanced technologies is a

transducer that is attractive, durable, highly rigid, well

dampened, and neutral.

Mechanical/AcousticalMechanical/Acoustical

Mechanical/Acoustical

Tone ShapingTone Shaping

Tone Shaping

The clear Lexan

panels on the back of the Logos stator

are the key elements of an innovative pressure compen-

sation technology. Martin-Logan is able to tone-shape the

diaphragm + or - 6dB without the use of an insertion loss

crossover. The advantage of this system is a high

efficiency driver with wide bandwidth capabilities of

dimensions which are easily integrated into a domestic

environment.

Curvilinear Line SourceCurvilinear Line Source

Curvilinear Line Source

Since the beginning of audio, achieving smooth full

range dispersion has long been a problem for all

loudspeaker designers. Large panel transducers

present even more of a challenge because the

larger the panel, the more directional the dispersion

pattern becomes.

Full range electrostatics have always been one of

the most complex 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 dispersion or a serious compro-

mise in sound quality.

After extensive research, Martin-Logan 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 tech-

nology, we developed the production capability to

bring this technology out of the laboratory and into

the market place.

You will find this proprietary Martin-Logan technology

used in all of our 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 all Martin-

Logan products.