JBL LSR6312SP User Manual
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 provides electronic control of response
peaks due to room modes. RMC
calibration kit included.
250 watt continuous output power
amplifier.
Sophisticated LCR bass management 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 frequency response and low power compression.
High density baffle for low resonance 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 sophisticated bass management capabilities in
stereo and multi-channel applications
where exceptional spectral accuracy
and high-SPL are required. The system includes JBL’s RMC™ room mode
correction circuit. The system is
designed around JBL’s 252F LF transducer, which uses dual voice coils
and a powerful neodymium magnet.
With the patented Neodymium
Differential Drive NDD™ technology,
power compression is kept to a minimum. An additional third coil located
between the two drive coils acts as a
dynamic brake to limit excess excursion 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 continuously 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 accommodate 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 attenuator 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 spacing. 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.
LSR6312SP Linear Spatial Reference Powered Studio Subwoofer System
Switch 5 adjusts the low frequency spectrum to compensate for the boundary conditions that exist when a
subwoofer is placed against a wall or in a corner. Switch
5 reduces the output level below 50 Hz by 2 dB.
Discrete and bypass operation of the subwoofer can be
switched via a remote control plugged into a ¼" jack on
the rear of the enclosure. Shorting the ring and tip will
remove highpass filtering from the left, center, and right
inputs, thus sourcing the subwoofer from the direct input
only.
For compatibility with film industry playback standards,
a +10 dB LFE sensitivity is provided and engaged by a
push-on/push-off switch on the rear electronics panel.
This operates only on the Direct input, and its purpose is
to restore proper level to the LF effects channel, which
may have been previously attenuated by 10 dB during
program processing.
RMC™ Equalization
The LSR6312SP includes JBL’s exclusive RMC™ Room
Mode Compensation circuitry for final matching of the
system response to the room’s acoustics. RMC consists of
a single parametric cut-only equalizer that is individually
tuned to attenuate to the dominant room mode peak in
the system’s response, thus making the overall room
response linear. A kit including a small sound level meter,
test CD and a Q template, and a remote bypass switch
accompanies each system. Switch 6 defeats the RMC
function. The remote bypass switch is connected to the
LSR6312SP RMC remote bypass ¼" jack via a 2-conductor
cable.
With Differential Drive® Transducer Technology
U.S. Patent Nos. 5,748,760 and 5,828,767
Other U.S. and Foreign Patents Pending
Left Out
Left In
LSR6312SP
Linear Spatial Reference
Powered Subwoofer
Center OutCenter In
Right In
Right Out
Sensitivity
+10 dB
0 dB
Sub-Direct In
+4 dBu Input Sensitivity
+8 dBu Input Sensitivity
Signal Polarity Inverted
-4 dB Bass Alignment
Input Trim Active
RMC Defeat
Input
Trim
Cut
0
dB
WARNI NG!
AVIS!
SHOCK HAZARD DO NOT OPEN
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
I
0
Serial No:
JBL PROFESSIONAL
Northridge, CA. USA
Assembled in USA
Option Active
With Switch Up
Summed
LCR
Out
Bypass
Closed Contact: L-C-R Signals
Pass Straight Through Without Filtering
Sub Driven by "Sub-Direct" Input Only
Open Contact: L-C-R Signals
High Passed. Sub Driven by Summed Low
Passed L-C-R Signals plus "Sub Direct"
Nominal Configuration
Input Sensitivity: -10dBV
Flat
Bass Alignment:
Polarity: Normal
RMC: Defeated
Width
Frequency
24
Hz
See RMC Instructions before enabling
RMC
Make-up
Depth
96
0
-14
Hz
dB
WARNING: To Reduce Risk of Fire or Electric Shock
Do Not Expose This Equipment to Rain or Moisture
See Owners Manual for Set-up and Safety Precautions
RMC
Gain
Remote
Bypass
0
+ 6
dB
Switch
!
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