JBL Project EVEREST DD66000 User Manual page 9

Project EVEREST DD66000
The transducers, horns and crossover networks are housed in a visually
stunning enclosure that is reminiscent of both the Hartsfield and Paragon
systems. The specially curved baffle provides the sidewalls for the main horn.
The top and bottom horn flares are accomplished by the attachment of precision
molded SonoGlass™ horn "lips" to the upper enclosure surface. The UHF
driver is mounted to a SonoGlass™ horn which is itself mounted to the back of
the die cast aluminum housing.
All of the enclosure is 25 mm MDF. The complex bracing is used to precisely
hold the curved panels in exactly the correct shape allowing exceptional fit and
consistency.
The woofer baffle module is a 6-sided shell and form an extremely rigid and
secure final structure. A leather covered outer baffle is then applied giving the
total combined woofer baffle a thickness of 45 mm. The outer baffle is
removable should repair or replacement of the leather surface ever be
necessary.
The system is ported on the rear with a tuning frequency of 34 Hz. Two large
100 mm diameter flared ports are combined with the input connections on a
massive 3-piece die cast aluminum structure. The entire enclosure rests on 4
stainless steel foot assemblies. Stainless steel coasters are included to protect
wood and tile floors from damage from the spike feet. The grille assembly is
constructed of MDF and uses a thick, perforated metal sheet to provide the
curved shape. The grille is held on the enclosure using metal pins and rubber
cups.
The 1501Al and 476Be are both designed to be absolute minimum distortion
drive units. Although they are capable of tremendous acoustic output, their
design intent is to be completely linear in every way up to a reasonable drive
level. This enables the system to sound the same regardless of playback level.