JBL LSR6300 Series, Owner'S Manual

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LSR6332 Studio Monitor System
The LSR6332 Linear Spatial Reference Studio Monitor combines JBL's latest in transducer and technology
with recent breakthroughs in system design to provide a more accurate studio reference in a variety of pro-
duction environments.
The neodymium 12" woofer is based on JBL's patented Neodymium Differential Drive NDD™ technology. With
the Neodymium magnet structure and dual drive coils, power compression is kept to a minimum to reduce
spectral shift as power levels increase. An added third coil between the drive coils acts as a dynamic brake to
limit excess excursion and reduce audible distortion at the highest levels. The cone is made of a carbon fiber
composite forming a rigid piston supported by a soft butyl rubber surround.
The midrange is a 2" neodymium magnet structure with a woven 5" Kevlar cone. The powerful
motor structure was chosen to support the low crossover point to the woofer. In order to achieve the goal of accurate spatial response,
the crossover points are located at 250 Hz and 2.2 kHz. These transition points were chosen to match the directivity characteristics of
the three transducers.
The high frequency device is a 1" composite diaphragm integrated with an Elliptical Oblate Spheroidal (EOS) Waveguide with 100° by
60° dispersion, which is critical to the smooth spatial response required in today's working environments. The mid and high frequency
drivers are mounted within millimeters of each other on a cast aluminum sub-baffle that can be rotated for horizontal or vertical place-
ment. This allows maximum flexibility in placement to reduce console and ceiling splash that interferes with imaging and depth.
The crossover filters are optimized to yield 4th-order (24 dB/octave) Linkwitz-Riley electroacoustic responses from each transducer (in
phase; -6 dB at crossover). In order to achieve optimal symmetrical response in the vertical plane, both magnitude and phase compen-
sation are implemented in the crossover network. The crossover network allows the user to adjust the high frequency level above 3
kHz. This allows the listener to compensate for effects of near-field or mid-field spectral balance or differing amounts of high frequency
absorption. Components used in the crossover are exclusively low-loss metal film capacitors; low distortion electrolytic capacitors; high-
Q, high saturation current inductors and high current sand cast power resistors. The mid and high frequency transducers are magneti-
cally shielded to reduce interference when used in close proximity to CRT video and computer monitors.
Audio Connections
The LSR6332 is equipped with two pairs of 5-way binding posts. The lower pair feeds the woofer and the top pair feeds the mid and
high frequency elements. The connectors are designed to accept up to 10 AWG bare wire. Spacing of the two input terminal pairs allows
use of standard Dual Banana jacks. The two pairs are normally connected together with metal shorting bars. This allows either pair to
be used in normal operation. Alternative cabling possibilities include passive bi-amping, or using both terminals to get more "copper"
from the amplifier to the speaker. Positive voltage to the "Red" (+) terminal will produce a forward motion at the low frequency cone.
High Frequency Adjustments
The LSR6332 High Frequency level can be adjusted to compensate for placement or for "bright" rooms. The unit is shipped in the "flat"
or 0 dB position. If the system sounds too bright in your room, or if you are working very close to the monitors (under 1-1.5 meters). the
response above 2 kHz can be reduced by approximately 1 dB, as shown in Figure H:
0 dB
-1 dB
Figure H