JBL Portable Speaker LSR6312SP User Manual

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LSR6312SP
Linear Spatial Reference
Powered Studio Subwoofer
System
Key Features:
᭤
Multi-format powered subwoofer
for Dolby Prologic, AC-3, DTS and
other surround formats.
᭤
RMC™ Room Mode Correction pro-
vides electronic control of response
peaks due to room modes. RMC
calibration kit included.
᭤
250 watt continuous output power
amplifier.
᭤
Sophisticated LCR bass manage-
ment system.
᭤
Direct LFE input with selectable
10 dB input sensitivity.
᭤
Summed output allows chaining of
multiple LSR6312SP for multiple
subwoofer systems.
᭤
Neodymium Differential Drive
NDD™ technology with dynamic
braking for extended low frequen-
cy response and low power com-
pression.
᭤
High density baffle for low reso-
nance and stable inertial ground.
᭤
Linear Dynamics Aperture port
design minimizes port turbulence
and reduces power compression.
᭤
Reinforced enclosure with
standardized mounting points
allow mounted installation.
The LSR6312SP powered studio
subwoofer is designed to provide low
frequency extension and sophisticat-
ed bass management capabilities in
stereo and multi-channel applications
where exceptional spectral accuracy
and high-SPL are required. The sys-
tem includes JBL’s RMC™ room mode
correction circuit. The system is
designed around JBL’s 252F LF trans-
ducer, which uses dual voice coils
and a powerful neodymium magnet.
With the patented Neodymium
Differential Drive NDD™ technology,
power compression is kept to a mini-
mum. An additional third coil located
between the two drive coils acts as a
dynamic brake to limit excess excur-
sion and reduce audible distortion at
the highest operating levels. The
cone is made of a carbon fiber
polypropylene composite forming a rigid piston area supported by a soft
butyl rubber surround.
A 250-watt continuous power amplifier is integrated into the LSR6312SP
system and provides correct drive levels for optimized frequency response.
Amplification is class A-B in an all discrete topology.
The subwoofer derives its feed from a combination of Left, Center, Right
and Direct LFE inputs. Subwoofer signals can be selectively derived from
the front channels or from the Direct input alone using a simple Remote
Bypass contact closure switch. User-selectable settings are provided for -10
dBv, +4 and +8 dBu sensitivity. For calibration and level matching of the
system, an Input Trim control can be inserted into the circuit for continu-
ously variable attenuation of the system input. Additionally, the Direct input
has a dedicated Input Trim. The LSR6312SP includes Left, Center and Right
channel outputs to feed external satellite speakers. The LCR outputs are
high-passed at 80 Hz. A ¼" jack allows connection of a Remote LCR Bypass
contact closure switch. When the switch is used, full-range signals are sent
to the Left, Center and Right satellite speakers and the subwoofer derives its
feed from the Direct input only.
Subwoofer low pass filtering uses steep 5th order low pass sections to
minimize the possibility of localization of the subwoofer’s acoustic output.
High pass filtering for Left, Center and Right outputs is 12 dB/octave. For
convenience, input receptacles are Neutrik “Combi” type, which accommo-
date both XLR and ¼" connectors.
Six DIP switches on the input panel allow the user to precisely adjust the
gain and response of the system. DIP switch one inserts a variable attenua-
tor inserted into the circuit allowing the level to be trimmed from 0 to -13
dB. The Left, Center, Right and Direct inputs default to -10 dBv sensitivity.
Using DIP switches 2 & 3 the user can set input sensitivity for all inputs to
+4 dBu, +8 dBu or +12 dBu. A signal to any input will drive the output
level of the LSR6312SP to 96 dB SPL at 1 meter.
Switch 4 inverts the signal polarity of the subwoofer feed. This is used to
correct for placement mismatch between the subwoofer and satellite spac-
ing. Due to the varied placement options available in audio production
environments, it is suggested that this switch be adjusted after the final
placement of the system has been determined.

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