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JBL everest dd66000 maple Manual

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Figure 2 – 1501AL section view
The 1501AL low-frequency driver is a 15-inch (380mm)-diameter device with
a 4-inch (100mm) voice coil completely immersed in a radial field generated by
an alnico 5DG magnet. Alnico was chosen because of its stable operating point.
This material is insensitive to temperature changes and back EMF from the
coil. JBL has overcome the tendency of alnico to demagnetize with high drive
by utilizing a massive shorting ring at the base of the motor assembly. The top
plate is constructed of alternating copper-steel laminations. The presence of the
copper rings linearizes the magnetic properties of the gap to all but eliminate
eddy current distortion.
The outer suspension is made of EPDM foamed rubber, which has the longevity
and frequency response characteristics of traditional rubber surrounds, but with
a low density very close to that of foam surrounds. Low-loss EPDM material
was chosen so that the transient detail of musical signals could be preserved.
Dual inverted Nomex
®
spiders are employed for the cancellation of even-order
distortion components. All suspension elements are tailored for maximum
mechanical displacement linearity.
The cone consists of a special layered paper-pulp matrix with proprietary
Aquaplas damping, which offers more pistonic behavior throughout the
woofer’s operating bandwidth, and controlled cone breakup beyond it.
… 14 …


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