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4Pi II Omnidirectional Tweeter Unit The world-renowned omnidirectional “4-Pi ribbon tweeter” from ELAC stands for richness of detail, extreme plasticity, spatially extended acoustic images and exemplary neutrality. 360 degree omnidirectional ribbon tweeter yields a resonance-free upper cut-off frequency of 53 kHz and makes this tweeter an ideal component for the reproduction of SACD and DVD-A. Its impressive and silky sound quality gives rise to airy sound that comes off easily. The Principle:
X-JET II coaxial and coplanar Midrange-Treble Driver System The X-JET II is a unique combination of a flat (nomex honeycomb with crystal membrane) ring radiator midrange driver and a concentrically arranged JET III tweeter . By this the X-JET design approaches the radiation pattern of an ideal point source! This facilitates an optimized acoustic power response and results in a homogeneous and very wide sound dispersion angle (s.a. the graphics below) which provides for a new kind of relaxed but very precise and detailed reproduction.
The ultra lightweight honeycomb diaphragm provides a reduced stray magnetic field combined with a strong neodymium drive. The system is driven by a 78 mm moving coil. High efficiency is achieved using coppered aluminium flat wire, edgewise-wound, on a ventilated Kapton® bobbin. X-JET of the second generation: further optimized magnet system, improved internal design with additional damping, new midrange membrane configuration with Nomex honeycomb material / phenol paper top layers and crystal membrane. This results in an extended transmission range of the midrange part of the X-JET which facilitates more linear crossovers to the woofers and tweeters of the FS 609 CE. The new X-JET system yields a upper cut-off frequency of 50 kHz. This makes the loudspeaker an ideal component for the reproduction of DVD-A and SACD.
X-JET and 4Pi adjustment With the 4PI omnidirectional tweeter the acclaimed spatial depth and naturalness is achieved. You will be excited by sheer diversity of sound that is opened up! Thanks to the switch terminal at the back of the FS 609 CE a whole range of possibilities is enabled, from targeted “monitor sound” to “bathing in music”. The control panel of the FS 609 CE provides two step switches.
Crystal membrane The woobers of FS 609 CE contain the new "Crystal Membrane" (patent pending) and their design is based on the well-known "Aluminium-Sandwich AS Technology" which was developed by ELAC a couple of years ago. The crystal-shaped inverse aluminium dome is joined to the paper cone in a special glueing process resulting the desired sandwich construction. Glueing procedure The stamping of the aluminium foil looks like the surface of a large crystal, this is where the term "Crystal Membrane" come from. This stamping stiffens the aluminium dome considerably which diminishes the membrane-internal resonances resulting in less sound coloration and additionally improves the large signal behaviour noticeably. The voice coil is not only - like usually - joined to the neck of the paper cone, but also to the bottom of the aluminium dome. This design results in the expansion of the transmission range of the respective woofers or midrange drivers by nearly an octave. Therefore the abbreviation "XR" (eXtended Range) has been introduced. LLD Driver Technology The new LLD driver technology (Long Linear Drive) is based on the movement of a short-wound coil (winding height: 6.5 mm) in a long air gap (height: 16 mm) with a homogeneous magnetic field. This design results in extremely linear (without distortions) movement within an amplitude of ±8 mm. The voice coil exactly mirrors the applied audio signal.
The maximum displacement is an impressive ±16 mm.
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