JBL Synthesis K2 S9900 User Manual
Page 13
Project K2 S9900
13
045Be-1 UHF Driver
HF Network
Spiked Foot Assembly
LF Network
Die-Cast Aluminum Input
Plate/Port Assembly
1500AL-1 (380mm) LF Driver
UHF Network
476Mg 4" (100mm) HF Driver
SonoGlass HF Horn
Die-Cast Aluminum Housing
SonoGlass UHF Horn
Figure 2.
The 1500AL-1 and 476Mg are both designed to be absolute-minimum-distortion
drive units. Although they are capable of tremendous acoustic output, they are
designed 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.
T
ransducers
The 1500AL-1 Low-Frequency Driver
The 1500AL-1 low-frequency driver is very similar to the 1500AL used in
the K2 S9800 system. The voice coil length has been increased to 25.4mm
(from 20.3mm) and its milling width has been reduced slightly. This was done
to allow greater clearance from the outer diameter of the coil to the laminated
top plate and to provide a larger surface area of coil surface for heat dissipation.
The coil former perforations have been eliminated to allow greater forced
convection cooling from the pumping action of the diaphragm assembly. These
coil improvements allow the 1500AL-1 to handle up to 25 percent more power
than the 1500AL (Fig. 3).