4
En
About the EX series
The EX series, incorporating the abundant technological know-how behind Pioneer’s flagship TAD speaker series, was developed
with the goal of creating the ultimate speaker possible in its price range.
The design and production of the EX series result from an international effort that represents the finest in Pioneer’s speaker technology.
Technology behind the S-4EX
CST
The core driver of the system is the Coherent Source Transducer
(CST), which draws on the technology used in TAD. The tweeter
diaphragm is mounted concentrically within the apex of the
midrange cone and provides a point source of sound from 400 Hz
to 100 kHz. The CST ensures a perfect spectral balance between
the direct and reflected sounds that arrive at the listener’s ears,
providing a more consistent sound throughout the listening room
and improved imaging capability.
Ceramic Graphite Diaphragm
The CST’s tweeter features a ceramic graphite diaphragm that
provides top-level strength and dampening characteristics that
are practically unrivaled by any other available materials currently
used in high-end audio speaker systems. Ceramic graphite’s
lightness and exceptional strength combine to create speakers
whose diaphragm resonance can be pushed far beyond their
audible range.
Magnesium Alloy Diaphragm
The CST’s midrange features a magnesium alloy diaphragm
whose characteristic lightness and high inner loss provide
excellent transience and minimal coloration of midrange sounds.
Bass Drivers
The bass driver pictured below serves as the foundation of the
S-4EX speaker system. The driver’s strength is the result of the
Aramid/Carbon composite material, originally created during the
development of the S-1EX, that is used in its diaphragm. Pioneer’s
exclusive LDMC magnetic circuit technology has been
incorporated in order to preserve linearity from low to high output
levels and minimize distortion.
Bass Enclosure Construction
The unique form of the S-4EX is based upon logical necessity. In
order to synchronize the arrival time of sound from the CST and
the bass driver, each driver is mounted upon a baffle that serves
to create a highly delicate curve known as the “precision curve”
(see illustration below). Made of up to 65 mm thick MDF (Medium
Density Fiberboard), this baffle is, moreover, strong enough to
contain the force of the drivers. Additionally, the bass port has
been carved out of an extremely thick block of MDF, resulting in
the reduction of wind noise for clear, deep bass.
Crossover Networks
The crossover networks use only the finest components. Air cored
coils, noninductive resistors, and film capacitors in the signal path
are all carefully chosen and optimized for the CST driver to provide
the greatest transparency to the signal. The bass drivers use
silicon steel plate core inductors that minimize distortion and loss
during energy transfer. All components are connected directly to
their respective wiring materials, instead of a printed circuit-
board, allowing for minimal loss and maximum performance.
Collaboration with Air Studios
Since its establishment by George Martin in 1969, London,
England’s Air Studios has earned unequivocal respect from
scores of artists who recognize it as the world’s premier recording
studio. The Air Studios seal that was awarded to the S-4EX
indicates that these speakers are capable of producing the high-
quality sound demanded by the world’s top-class sound creators.
18 000
Velocity (m/s)
Inner Loss
16 000
14 000
12 000
10 000
8 000
6 000
4 000
2 000
0.005
0.015
0.025
0
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S-4EX_EN.book 4 ページ ２００８年７月１６日 水曜日 午後２時２分
