JBL DD66000CH-EVEREST II [DD66000CH], Руководство пользователя

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Project Everest DD66000
15
A thick-wall, cast-aluminum frame is used to rigidly support the motor
structure. This fully vented frame and motor design also serves to minimize the
back pressure under the dome and spider, helping to reduce harmonic distortion
to even lower levels.
JBL’s Vented Gap Cooling
™
(VGC) is incorporated within
the motor structure, and lowers the operating temperature of the coil during
moments of high power operation.
All together, these design factors provide reduced harmonic distortions at very low
and high acoustic output, improved power handling, reduced power compression,
and more consistent spectral balance, with varying input drive level.
476Be High-Frequency Compression Driver and Bi-Radial
®
Horn
The 476Be high-frequency compression driver makes use of a 4-inch (100mm)-
diameter, pure-beryllium diaphragm with a 4-inch (100mm) aluminum edge-
wound coil, operating into JBL’s existing rapid-flare-type, coherent-wave
phasing plug. The use of an efficient neodymium rare-earth motor structure
with a new copper-sleeved polepiece maintains maximum gap flux and reduced
coil inductance at a minimal size and weight. The combination of these features
has resulted in a driver that can deliver superior sound quality, regardless of
acoustic power output, with very little distortion and power compression.
Figure 3 – 476Be section view