MartinLogan Center Channel Speaker Logos User Manual Download Page 7

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Page 7

Logos User's Manual

Martin-Logan Exclusives

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 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/Acoustical

Mechanical/Acoustical
Tone 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
dia 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 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.