Manual JBL everest dd66000 maple (page 15 of 42) (English)

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Project Everest DD66000

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

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JBL everest dd66000 maple Manual

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