Pioneer S-4EX-QL: About the EX series Technology behind the S-4EX

S-4EX_EN.book 4 ページ ２００８年７月１６日　水曜日　午後２時２分

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.

Bass Drivers

The bass driver pictured below serves as the foundation of the

Technology behind the S-4EX

S-4EX speaker system. The driver’s strength is the result of the

Aramid/Carbon composite material, originally created during the

CST

development of the S-1EX, that is used in its diaphragm. Pioneer’s

The core driver of the system is the Coherent Source Transducer

exclusive LDMC magnetic circuit technology has been

(CST), which draws on the technology used in TAD. The tweeter

incorporated in order to preserve linearity from low to high output

diaphragm is mounted concentrically within the apex of the

levels and minimize distortion.

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.

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

Ceramic Graphite Diaphragm

the bass driver, each driver is mounted upon a baffle that serves

to create a highly delicate curve known as the “precision curve”

The CST’s tweeter features a ceramic graphite diaphragm that

(see illustration below). Made of up to 65 mm thick MDF (Medium

provides top-level strength and dampening characteristics that

Density Fiberboard), this baffle is, moreover, strong enough to

are practically unrivaled by any other available materials currently

contain the force of the drivers. Additionally, the bass port has

used in high-end audio speaker systems. Ceramic graphite’s

been carved out of an extremely thick block of MDF, resulting in

lightness and exceptional strength combine to create speakers

the reduction of wind noise for clear, deep bass.

whose diaphragm resonance can be pushed far beyond their

audible range.

Precision curve

Velocity (m/s)

3 m

18 000

16 000

1 m

14 000

12 000

10 000

Crossover Networks

8 000

The crossover networks use only the finest components. Air cored

6 000

coils, noninductive resistors, and film capacitors in the signal path

are all carefully chosen and optimized for the CST driver to provide

4 000

the greatest transparency to the signal. The bass drivers use

silicon steel plate core inductors that minimize distortion and loss

2 000

during energy transfer. All components are connected directly to

their respective wiring materials, instead of a printed circuit-

0

board, allowing for minimal loss and maximum performance.

0.005 0.015 0.025

Inner Loss

Collaboration with Air Studios

Since its establishment by George Martin in 1969, London,

Magnesium Alloy Diaphragm

England’s Air Studios has earned unequivocal respect from

The CST’s midrange features a magnesium alloy diaphragm

scores of artists who recognize it as the world’s premier recording

whose characteristic lightness and high inner loss provide

studio. The Air Studios seal that was awarded to the S-4EX

excellent transience and minimal coloration of midrange sounds.

indicates that these speakers are capable of producing the high-

quality sound demanded by the world’s top-class sound creators.

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