Stax
Industries, Ltd, is japan's oldest and most honored manufacturer of specialized
audio equipment. In 1959 Stax developed the world's first electrostatic
headphone - marketed the following year as the SR-1. [Today] Thirty years later, president Naotake
Hayashi and his son Takeshi Hayashi continue their tradition by offering the
finest headphones for both professional and audiophile applications. Stax
prefers to call its headphones "Earspeakers"; such Ultra-High
Fidelity devices for reproducing music can only be compared with the best
cost-no-object loudspeakers, not other headphones. The term
"Earspeaker" is therefore more descriptive of Stax's contribution to
today's most advanced level of sonic transduction.
The Stax
philosophy revolves around a single tent; the more precisely the reproduction
mirrors the original live sound, the more clearly one may grasp the soul of the
musical composition and performance. With this belief constantly in mind, Stax
strives to make products providing the highest performance, reliability and
value.
The most
advancedd product of the Stax Industries, are:
Stax
SR-Γ Series (Pro);
Stax
SR-Σ Series (Pro);
Stax
SR-Λ Series (Professional and
Signature);
And SR-X,
SR-5, SR-84 or SR-34
How
Electrostatic Earspeaker Works
If we speak
of a headphone, it usually means a dynamic one employing a dynamic transducer.
In the dynamic transducer the driving force is applied only to the one part of
the diaphragm which, therefore, must be stiff enough not to be deformed by air
load. However, stiff materials considerably increase the diaphragm mass
resulting in significant deterioration of transient response. In addition, the
ununiform force applied over the diaphragm area leads to ehat is called
"cone break-up". Hysteresis distortion caused through the magnet
inevitable in the dynamic transducer cannot be ignored, either.
The
electrostatic transducer adopted in the Stax earspeakers consist of two
parallel-arranged fixed electrodes and several microns thick (2 microns in the
SR-Sigma, the SR-lambda,the SR-X/Mk3 and the SR-5N. 6 microns in the SR-84 and
the SR-34) high-polymer film diaphragm suspended in the middle of the
electrodes. The low-mass film diaphragm is supplied with the biasing voltage
from the energizing adaptors or from the SRM-1/Mk2. In the electret type
earspeakers like the SR-84 and the SR-34
the diaphragm is permanently charged minus. When the fluctuating voltage of the
audio signal is applied to the electrodes, the diaphragm is pulled by the
electrode which has the opposite charge of the diaphragm's and simultaneously
pushed by the other electrode which then has the like charge of the
diaphragm's. the continuous flow of alternating voltage in interpretation of
audio signals causes the diaphragm to vibrate in faithful compliance with the
amplifier output without time lag, assuring undistorted sound waves. This is
why the Stax electrostatic earspeakers sound so good. The figure above shows
the driving mechanism of the SR-84 and the SR-34.
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