Basic Configuration; Enclosure Construction; Sonoglass - JBL Project Everest DD66000 Brochure & Specs

B a s i c C o n f i g u r a t i o n
Project Everest DD66000 is an augmented two-way speaker
system, a classic JBL design. One 380mm (15") woofer
crosses over to a horn-loaded compression driver at 700Hz,
the midpoint of the audio spectrum. A second 380mm
woofer reinforces bass from below 30Hz to 150Hz, while
an ultrahigh-frequency driver operates exclusively in the
supersonic realm above 20kHz.
The choice of crossover points minimizes the sonic
degradation that can be caused by even a high-quality
dividing network. The woofers are phased to achieve
uniform directivity across their entire operating range, greatly
enhancing low-end realism. With unparalleled dynamic
linearity and harmonic distortion levels approaching those
of a fine amplifier, we know of no loudspeaker system better
able to realistically reproduce the subtlest nuances of any
musical source.
E n c l o s u r e C o n s t r u c t i o n
Project Everest's exquisite and flawlessly finished enclosure,
designed by Daniel Ashcraft, is itself an integral system
component, playing a key role in overall performance.
The elegant curves of the front baffle, which recall the
legendary design of JBL's Hartsfield and Paragon speakers,
form the side walls of a large high-frequency horn, along with
top and bottom flares molded of high-impact SonoGlass
The woofer baffle is a separately braced six-sided assembly,
incorporating two MDF panels with a total thickness of 45mm
Die-cast aluminum housing

SonoGlass

® UHF horn
EPDM foamed rubber surround
Control panel cover
LF-2 level trim
dBSPL
105
100
95
90
85
LF1
80
75
70
65
60
55
20 Hz 50 100
On-axis response of the DD66000 system and each of the transducers through its
LF2 HF
200 500 1K 2K 5K 10K 20K
crossover network (2.83V @ 1 m)
in order to support the dual 380mm woofers. The curved
panels, created in a proprietary manufacturing process, are
joined to the flat MDF panels with a complex internal bracing
system.
The genuine leather that is applied to the baffle lends a
luxurious look, while also absorbing/dispersing unwanted
sound reflections from the surface.
SonoGlass ® is an extremely dense and mechanically
inert compound that is made using high-temperature and
pressure-molding technology. The extreme heat resistance,
low resonance, inertness and rigidity of the substance are
properties that have been optimized for acoustic applications.
Its thermal stability and imperviousness to chemical reaction
make it possible to produce durable, high-precision horns
with optimal manufacturing control of the horn flare, for a
smooth energy transmission path. The high sensitivity, low
distortion and high resolution of JBL compression drivers are
enhanced further in com bi nation with the Sono Glass horns.
In the Everest DD66000, Sono Glass is used in the upper and
lower lips of the HF horn, the
HF horn throat, and the UHF
horn to produce clear, detailed
sound without resonance or
coloration.
.
®
SonoGlass ® HF horn
045Be-1 25mm UHF driver
SonoGlass HF horn throat
®
476Be 100mm HF driver
1501AL 380mm woofers
UHF crossover
Control panels
LF-1 trim
Die-cast aluminum input
plate/port assembly
Spiked foot assembly
UHF
50K
Custom-developed drivers, designed exclusively for Project Everest DD66000
SonoGlass ®