JBL LSR4312SP User manual

LSR4312SP
Linear Spatial Reference
Powered Subwoofer
Owner’s Manual

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Important
Safety Instructions
1. Read These Instructions - Before operating your new JBL product, please read safety and operating
instructions.
2. Keep These Instructions - For future reference and troubleshooting purposes, retain these instructions.
3. Heed All Warnings - All warnings in this manual should be followed.
4. Follow All Instructions
5. Water and Moisture - This product is intended for indoor use only. Do not use this apparatus near water or
plumbing fi xtures.
6. Cleaning - Do not use any solvent based cleaners on the fi nish. To clean enclosure, turn off speaker and
disconnect power cord then clean only with a lint-free cloth moistened with water.
7. Ventilation - Do not block any ventilation openings, including the Linear Dynamics Aperture Port on the
monitor systems. Install these products in accordance with manufacturers instructions. Do not install near any
heat sources such as radiators, heat registers, stoves or other apparatus that produce heat. Separate product
from surrounding materials and walls by 100 mm (4 in) or more on each side and top of product.
8. Grounding and Power Cords - Protect the power cord from being walked-on or pinched, particularly at the
plug’s convenience receptacle and the point where it connects to the apparatus. Do not defeat the safety
purpose of the grounding type plug. The power cord supplied with your powered product has a plug with 2
blades plus a 3rd grounding prong. Do not cut off or damage the grounding prong. If the provided plug does
not fi t into your outlet, consult an electrician for replacement of the obsolete outlet.
All powered products are fi tted with a detachable power cord (supplied) which connects to the chassis AC
connector. The speaker should be positioned such that the IEC power cord can be easily removed. The
power cord has an IEC female connector on one end and a male mains connector on the other end. This cord
is supplied specifi cally to accommodate the different safety and electrical code requirements of individual
countries. The model is designed to operate within a specifi ed voltage range and must not be connected to a
power source that does not conform to the specifi ed voltage range. If you are traveling abroad with your system,
confi rm the power mains supply the specifi ed voltage before connecting your equipment to the power mains.
9. Options - Only use attachments or accessories specifi ed by JBL Professional.
10. Non-use Periods - Unplug this apparatus during lightning storms or when it will be unused for long periods
of time.
11. Servicing - Refer all servicing to qualifi ed service personnel. Servicing is required when the apparatus does not
operate normally or has been damaged in any way, including: power supply cord or plug is damaged, water or
other liquid has been spilled or objects have fallen into the apparatus.
12. Carts and Stands - The appliance should be used only with carts or stands that are sturdy and well balanced.
All appliance and cart combinations should be moved with care. Quick stops, excessive force, and uneven
surfaces may cause the appliance and cart combination to overturn.

iv
13. Fire - No naked fl ame sources, such as lighted candles, should be placed on the surface, of the apparatus.
Explanation of Graphic Symbols
The exclamation point within an equilateral triangle is intended to alert
the users to the presence of important operating and maintenance (ser-
vicing) instructions in the literature accompanying the product.
The lightning fl ash with the arrowhead symbol, within an equilateral
triangle, is to alert the user to the presence of insulated “dangerous
voltage” within the products enclosure that may be of suffi cient
magnitude to constitute a risk of electric shock to humans.
CAUTION: TO REDUCE THE RISK OF ELECTRONIC SHOCK - DO
NOT REMOVE COVER. NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED PERSONNEL. DO NOT EXPOSE
THIS APPARATUS TO RAIN OR MOISTURE.
ATTENTION: POUR EVITER LES RISQUES DE CHOC ELECTRIQUE,
NE PAS ENLEVER LE COUVERCLE. AUCUN ENTRETIEN DE
PIECES INTERIEURES PAR L’USAGER. CONFIER L’ENTRETIEN
AU PERSONNEL QUALIFIE. AVIS: POUR EVITER LES RISQUES
D’INCENDIE OU D’ELECTROCUTION, N’EXPOSEZ PAS CET
ARTICLE A LA PLUIE OU A L’HUMIDITE.
© 2006 Harman International Industries, Incorporated. All Rights Reserved.
Important Safety Instructions

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Table Of Contents
Safety Instructions .......................................................................iii
Introduction ....................................................................................1
Quick Start .....................................................................................5
Reference .....................................................................................11
Front Panel ...........................................................................................11
Rear Panel ............................................................................................19
Remote Control ....................................................................................22
Subwoofer Placement and Polarity Setting ..........................................24
AC Power Connections ........................................................................25
Network Connections and DIP Switch Settings ...................................25
Audio Connections ...............................................................................28
Protection Circuitry in the LSR4312SP ................................................29
RMC™ Room Mode Correction ...........................................................32
Restoring Factory Settings ...................................................................33
LSR4300 Control Center Software .......................................................33
Appendix A: About Surround Sound ..........................................34
The LFE Channel ..................................................................................34
+10 dB Gain .........................................................................................34
Bass Management ................................................................................34
Appendix B: Using Two LSR4312SP Subwoofers .....................36
Appendix C: Using the LSR4312SP with Speakers
Other Than the LSR4328P / LSR4326P ......................................39
Appendix D: System Block Diagram ..........................................40
Appendix E: Wiring Requirements .............................................42
Appendix F: Error Messages and Troubleshooting ..................45
Appendix G: Important Information About LSR4300 Firmware .....47
Specifi cations ..............................................................................48
Warranty Statement ....................................................................50
JBL Professional Contact Information ......................................52

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v

1
Introduction
Congratulations on your purchase of the JBL LSR4312SP Linear Spatial Reference Powered Subwoofer.
We know that very few people read owner’s manuals from cover to cover, so we’ve organized this one to
make it easy to fi nd the information you need.
The Features section on the next page provides a brief overview of the exceptional features of the
LSR4312SP. It’s followed by a QuickStart section, which will get you up and running in a matter
of minutes.
Once you’ve got your LSR4312SP powered up and delivering sound, you should turn to the Reference
section, which describes every feature and function of the LSR4312SP in detail. Finally, we’ve included a
number of technical appendices and specifi cations at the end of this manual.
Note that this owner’s manual covers the model LSR4312SP subwoofer only. Separate documentation is
provided for the LSR4328P and LSR4326P model studio monitors and for the LSR4300 Control Center
software and is available for download at www.jblpro.com/lsr.
Manual Conventions
The following conventions will be used in this owner’s manual:
X Especially important tips and cautions will be presented like this.
Indicates that a button is lit.
Indicates that a button is blinking.

2
Indicates that an LED is lit green.
Indicates that an LED is lit red.
This owner’s manual assumes that your LSR4312SP subwoofer is being used in a networked system
consisting of one or more JBL LSR4328P and/or LSR4326P studio monitors. However, the LSR4312SP
can also be used with other speakers, although some of its most advanced features will not be functional.
See Appendix C on page 44 for a full description of how to use the LSR4312SP in a non-networked
system of speakers other than the LSR4328P / LSR4326P.
Features
Using a combination of JBL’s legendary expertise in acoustics and cutting-edge digital technology, the
LSR4312SP subwoofer has been designed to provide the all-important low frequency content of your mix
with accuracy and precision. Because it is capable of reproducing frequencies as low as 20Hz, it extends
the range of your system, and its many advanced features make it ideal for use in professional music,
postproduction, and broadcast applications.
RMC™ Room Mode Correction
The biggest challenge for anyone producing audio is creating a mix that sounds great on all playback
systems. If you think of a monitoring system as a kind of “lens” through which you hear sound, the
object is to have the lens be crystal-clear and transparent so that it imparts no coloration whatsoever
to the signal being played back. However, every loudspeaker system, no matter how well designed,
interacts with the room in which it is installed. Lack of correct acoustic treatment (or, worse yet, lack of
any treatment at all) can result in anomalies such as resonant frequencies and low-frequency “standing
waves” – the aural equivalent to the lens being “smeared.” Trying to create a mix in such an environment
can be as frustrating and diffi cult as trying to paint a masterpiece while blindfolded.
JBL’s exclusive second generation RMC™ Room Mode Correction technology is designed to solve
the problem. A powerful onboard computer in each LSR4300 loudspeaker and LSR4312SP subwoofer
automatically analyzes the frequency response of your room and compensates for low frequency
inaccuracies in the listening space by precisely inserting fi lters so that all signals arrive at the mix position
with the intended frequency response. In effect, the LSR4300 Series goes “beyond accurate,” allowing
Introduction - Manual Conventions

3
you to eliminate the guess-work and create reliable mixes that translate to any environment. Additionally,
the RMC process automatically trims all speaker levels and, in the LSR4312SP, even sets the correct
polarity so as to compensate for variations in placement relative to the mix position, thus ensuring
balanced mixes that are neither bass-heavy nor bass-light.
HiQnet™ Networking
The LSR4300 Series incorporates the new Harman HiQnet™ protocol that networks up to eight studio
monitors and two subwoofers in a system and allows full control from the front panel, a wireless remote
control, or from a computer via a standard USB connection and LSR4300 Control Center Software.
With the push of a button or the click of a mouse, you can change the system level, choose from any of
three different inputs (one analog and two digital), solo individual speakers and subwoofers, and make
adjustments to various parameters such as bass management and LFE fi ltering. HiQnet™ networking also
allows bass management for the entire system to be turned on or off, again at the push of a single button
or click of the mouse. (See Appendix A on page 34 for more information.)
LSR Linear Spatial Reference Design
The LSR4312SP subwoofer employs the Linear Spatial Reference technology that has made the LSR4300
and LSR6300 Series of studio monitors so popular in recording, postproduction, and broadcast facilities
worldwide. It has been designed from the ground up to provide accurate in-room response in a wide
variety of acoustic spaces.
Surround Smart
The LSR4312SP subwoofer is ideal for surround sound production. Up to eight main speakers (any
combination of LSR4326 and LSR4328 models) and up to two LSR4312SP subwoofers can be easily
confi gured for LCRS, 5.1, 6.1, theatrical 7.1, and larger mixing and monitoring applications.
Once all LSR4300 monitors and subwoofers are positioned, RMC and HiQNet™ automatically calibrates
the entire system, setting relative volume and subwoofer polarity so that the sound from all channels is
properly balanced when it arrives at the mix position. The end result is precise balance regardless of each
speaker’s actual physical placement.
The ability to centrally control the volume of all speakers and selectively mute or solo them (via wireless
remote control or LSR4300 Control Center software) is particularly useful in surround sound applications
where the recording system does not provide a multi channel monitor volume control, or where adjustable
monitor volume is not available when using the mixing system’s digital outputs. Similarly, the ability to
remotely switch between three digital and analog input sources – all without having to leave the mix
position – enhances system capabilities by allowing you to monitor not only the main recording system,
but also any two additional connected sources such as DVD and CD players, multi channel processors
and encode/decode units. This alleviates the need to purchase additional outboard monitoring hardware.
In addition, a dedicated LFE (Low Frequency Effects) input and advanced onboard bass management
features (see Appendix A on page 34 in this manual), as well as the ability to switch bass management on
and off remotely, make the LSR4312SP the perfect subwoofer component for the production of surround
sound.
Introduction - Features

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Selectable Inputs
The LSR4312SP subwoofer provides six discrete balanced analog XLR inputs (Left, Right, Center, Left
Surround, Right Surround, and LFE) with selectable +4dBU / -10dBv sensitivity, as well as balanced ¼-
inch inputs for the Left and Right channels. In addition, dual high-resolution 96 kHz stereo AES/EBU and
S/PDIF digital inputs are provided. This variety of inputs allows the LSR4312SP to be connected to a wide
range of devices, including digital workstations, CD players, DVD players, and multichannel processors.
What’s more, you can determine which input is to be monitored with the push of a button on either the
front panel or wireless remote or click of a mouse (via an attached computer and LSR4300 Control Center
software*).
Other Features
• 12-inch self-shielded transducer with neodymium motor structure, self-powered with 450 watts
of
internal amplifi cation, eliminating the need for external amplifi ers or speaker cabling.
• Ultra-low frequency response to 20Hz, measured in-room.
• Advanced front-panel user interface allows control of system functions such as volume, solo,
input selection, RMC initiation and bypass, bass management on/off, bass management crossover
and LFE lowpass fi lter selection, and brightness level of the meter and buttons.
• Front panel meters show continuous output levels in dBFS.
• Built-in side handles aid in the positioning of the LSR4312SP subwoofer.
Note:
* Use of the wireless remote control and LSR4300 Control Center Software requires that the LSR4312SP
subwoofer be used in a system with one or more LSR4328P or LSR4326P studio monitors.
Introduction - Features

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Quick Start
The LSR4312SP subwoofer includes:
• One subwoofer
• CAT5 network cable
• AC power cord
• This owners manual
If you’re planning to use your LSR4312SP in a networked system of LSR4300 speakers, you will need
the following:
• One or more LSR4328P or LSR4326P speakers, with CAT5 network cables, AC power cords, and
owners manual
• LSR4300 Accessory Kit, containing:
o Calibration microphone and mic clip
o Infrared wireless remote control
o LSR4300 Control Center Software
o 16-foot USB cable
o Two network terminators
o Two AAA batteries
Here are simple step-by-step instructions to get you up and running quickly:
1. Unpack the LSR4312SP. To avoid damage to the speaker elements, open the top of the box, keep
the styrofoam end cap on, and roll the box upside down. The box can then be slipped off. (This also
works in reverse for repacking the units.)
X Be sure to not grasp the LSR4312SP from the front. A stray hand or fi nger can cause damage to the
transducer.
2. Position the LSR4312SP in the room.
(See page 24 in this manual for subwoofer placement tips.)

6
Digital audio
connectors
Input Sensitivity
switch
Analog audio
Bass Management
input/output
connectors
Active Input
display
AC connector
DIP switches
USB connector
CAT5 connectors
+10dB LFE Gain
switch
Analog audio
LFE channel
input/output
connectors
Fuse
LSR4312SP Rear Panel
Quick Start

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3. Connect the LSR4312SP to a suitable power source using the supplied AC power cable.
4. If you are using the LSR4312SP in a system with other LSR4300 studio monitors, network the
speakers together in any order using the supplied CAT5 cable. Plug one end of the cable into either of
the two HiQnet ports on one speaker or subwoofer and the other end into a HiQnet port on another
speaker or subwoofer until all units are connected. Connect the two supplied RJ45 network terminator
plugs to the fi rst and last speakers or subwoofers in the chain. (See page 25 in this manual for more
information on networking your LSR4300 system.)
5. Set the Network ID DIP switch on the rear panel of the subwoofer. If you are using only one
LSR4312SP subwoofer, set only the topmost DIP switch (labeled SUB1) to the ON (right) position and
set the second DIP switch (labeled SUB2) to the OFF (left) position. If you are using two LSR4312SP
subwoofers, set one to “SUB1” and the other one to “SUB2”. (See Appendix B on page 38 in this
manual for more information.)
X One subwoofer in the system must have the its topmost (SUB1) DIP switch set to the ON position. If you are
using two subwoofers, set only one to SUB1 and the other to SUB2. If both switches are accidentally set ON or
OFF, the subwoofer(s) will indicate an error condition by strobing fi ve front-panel LEDs and all buttons will begin
blinking.
6. Make all required audio connections by connecting your audio devices to the analog and/or digital
inputs of the LSR4312SP fi rst, and then use its analog and/or digital outputs to distribute the signal to
the main speakers. The LSR4312SP subwoofer is able to accommodate up to six channels of analog
signal, and it also includes one stereo S/PDIF digital input and one stereo digital AES/EBU input.
The instructions below explain how to interconnect the LSR4312SP with stereo and multichannel
(surround) analog and digital sound sources. (See page 28 in this manual for more information on
audio connections.)
To connect stereo analog signal sources:
a. Connect the Left and Right analog outputs of the source to the LEFT and RIGHT XLR or ¼�
inputs of the LSR4312SP using appropriate cables.
b. Set the rear panel Input Sensitivity Switch to +4 dBu (switch IN) or -10 dBV (Switch OUT) to
match the nominal level of the signal source.*
c. Connect the LEFT and RIGHT outputs of the subwoofer to the inputs of the Left and Right
speakers using appropriate cables. (See appendix E on page 46 for a wiring diagram)
To connect multichannel (surround sound) analog signal sources:
a. Connect the Left, Right, Center, L Surround, and R Surround analog outputs of the multichannel
signal source to the corresponding XLR Bass Management inputs of the LSR4312SP using
appropriate cables.
b. Connect the LFE (Low Frequency Effects) output of the multichannel signal source to the LFE
input of the LSR4312SP.
c. Set the rear panel Input Sensitivity Switches for all speakers to +4 dBu (switch IN) or -10 dBV
(Switch OUT) to match the nominal level of the signal source. *
*If you are uncertain how to set this switch, consult the owners manual for the signal source. Most
professional devices output +4dBu level signals and most consumer devices output -10 dBV signals.
Quick Start

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d. Connect the LEFT, RIGHT, CENTER, L SURROUND, and R SURROUND “through” outputs of
the subwoofer to the inputs of the corresponding speakers. (See the illustration on page 33 in this
manual for reference.)
To connect stereo digital signal sources:
a. Connect the digital output of the source to either the S/PDIF or AES/EBU digital input of
the LSR4312SP.
b. Set the following DIP switches on the rear panel of the LSR4312SP:
i. Select which channel(s) of the digital stream the LSR4312SP will reproduce by enabling DIP
switches #3 and/or #4 for Channel A, Channel B or both.**
ii. To apply bass management to a stereo digital signal, set the LFE / Bass Management DIP
switch (switch #5) to Bass Management.
c. Connect the LSR4312SP S/PDIF and/or AES/EBU output to the S/PDIF and/or AES/EBU digital
input of the LEFT channel speaker.
d. Connect the S/PDIF and/or AES/EBU output of the left channel speaker to the S/PDIF and/or
AES/EBU digital input of the right channel speaker.
* A stereo digital signal can be distributed to speakersin any order using the speaker’s inputs and
outputs. Such as: L, Sub, R; R, Sub, L; Right Left Sub; Left Right Sub; Sub, L, R; Sub, R, L.
To connect multichannel (surround sound) digital signal sources:
The S/PDIF and AES/EBU inputs may be assigned to receive an LFE (Low Frequency Effects) signal. Bass
management of multiple digital signals requires an external bass management processor that provides a
monaural or stereo bass managed signal to the subwoofer(s).
a. Connect the digital LFE output of the multichannel source or output of an external bass
management processor to either the S/PDIF or AES/EBU digital input of the subwoofer.
b. Set the following DIP switches on the rear panel of the subwoofer:
i. Typically, the digital signal will carry the LFE signal paired with another signal, most often
the Center channel signal, on the same wire. Consult your documentation to determine
which channel of the digital stream (A or B) carries the LFE signal and set the LSR4312SP to
reproduce that channel by enabling either DIP switch #3 for Channel A or DIP switch #4 for
Channel B. Do not enable both DIP switches.
ii. Set the LFE / Bass Management DIP switch (switch #5) to LFE.
c. Connect the digital S/PDIF and or AES/EBU output(s) to the other speaker that requires the
signal (for example, the Center speaker). (Consult the owners manual for the LSR4328P and
LSR4326P for DIP switch settings and speaker ID information.)
d. If the subwoofer is receiving a bass managed signal from an external processor, make sure the
LFE Low Pass Filter is set to NONE. (See #8 on page 14 for more information.)
** Typically Ch A= Left channel of the digital signal, Ch B= Right channel of the digital signal.
Quick Start

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X When using an external Bass Management Processor, set DIP switch #5 to LFE and set Low Pass Filter to
NONE.
X When using digital audio inputs, the setting of the third and fourth DIP switches determine which channel or
channels of the stereo AES/EBU or S/PDIF signal will be reproduced by the LSR4312SP, and at least one of these
switches must be in the ON (RIGHT) position. If both switches are placed in the OFF (left) position, all fi ve LEDs in
the meter display will strobe and all buttons will blink, indicating an error condition. If both switches are placed in
the ON (RIGHT) position, the LSR4312SP will reproduce signal coming from both A + B channels.
LSR4312SP Front Panel
7. Press the front panel INPUT button on the subwoofer or on any networked speaker so that it begins
blinking. While it is still blinking, press the + / - controls on any speaker to select the desired input. The
front panel LEDs and the rear panel ACTIVE INPUT display shows which of the three inputs (Analog, S/
PDIF, or AES/EBU) is currently selected. If a digital input is selected, the rear panel ACTIVE INPUT display
also shows which channel(s) are being reproduced by that speaker. See #10 on page 16 in this manual for
more information about input selection.
8. Set the bass management crossover and/or LFE fi lter frequency as desired.
a. If you are using bass management (see page 34 in this manual for more information), set the
Bass Management Crossover frequency as desired by pressing the BASS MGMT X OVER button,
followed by the + and – buttons. If you don’t know what frequency to use, we recommend starting
with the Bass Management crossover set at 80Hz. Press the bass management ON button to
enable bass management. The button will illuminate. (See #7 on page 13 in this manual for
more information.)
b. If you are not using bass management, set the LFE Filter frequency as desired by pressing the
LFE FILTER button, followed by the + and – buttons. If you don’t know what frequency to use, we
recommend starting with the LFE Filter set at 80Hz. (See #8 on page 14 in this manual for
more information.)
9. Temporarily power down the entire networked system by pressing the front panel POWER button
on any speaker or subwoofer, then power on your signal source. Finally, power on all speakers in the
networked system by pressing the front panel POWER button on any speaker (or subwoofer) again. All
speakers and subwoofers in the system will power on (the JBL Logo will change from dimly to brightly lit.)
Quick Start

10
X To avoid “thumps” which can damage your speakers and subwoofers, always power up the signal source
FIRST and your LSR4300 system LAST.
10. Set the initial speaker volume by pressing the + / - controls on the subwoofer or on any speaker. All
speakers in the system will go to the designated volume. As the volume is increased, additional LEDs
light. We recommend beginning with a modest volume setting, so that only the fi rst ten LEDs or so (up to
the “-20”) mark are lit.
11. Play the signal source and adjust the overall volume to a comfortable listening level by pressing the
+ / - controls on any speaker.
12. If your LSR4300 system is brand new, the RMC button on the front panel of all
speakers and subwoofers will be lit, indicating that Room Mode Correction has not yet been performed.
For more information about calibrating your system with RMC, see page 32 in this manual.
13. Finally, put on some good music to listen to and take a few moments to read the rest of this manual to
acquaint yourself with all the features of your JBL LSR4312SP subwoofer.
Enjoy!
Quick Start

11
Reference
Front Panel
LSR4312SP Front Panel
The controls and displays on the front panel of the LSR4312SP allow you to adjust and view various
subwoofer settings. Below is a listing and description of each.
Control and Display:
1. Meter Display – In combination with front panel buttons, the meter is used to display the current
setting and status of the following functions:
• Power On (see #3 below)
• SOLO function (see #4 below)
• Progress of RMC calibration process (see #5 below)
• Bass management crossover frequency (see #7 below)
• LFE fi lter frequency (see #8 below)
• Subwoofer Level (see #9 below)
• Input Source selection (see #10 below)
• Overall system volume (see #11 below)
• Meter and button brightness (see #11 below)
• Error conditions
The meter has 31 segments that can illuminate in green, amber or red, plus a 32nd clip indicator
segment on the far right that lights red when the LSR4312SP is over-driven. For many of the above-listed
operations, all segments light green only. However, when audio signal is being output by the LSR4312SP,
all three colors are used and the meter is calibrated to indicate the continuous output in decibels (dB)
below the subwoofer’s full output capability. Green LEDs indicate signal 8 dB (or more) below clipping;
amber, approximately 7 to 4 dB below clipping; and red, approximately 3 to 0 dB below clipping. The
segment furthest to the right illuminates red when the input signal is has reached its maximum value to
indicate the onset of clipping.

12
X The LSR4312SP provides protective limiting. Limiting occurs when the output signal exceeds -2 dBFS (that is,
when the second LED from the right is illuminated).
2. Power Indicator – The JBL logo lights at two different levels. It is illuminated dimly whenever the
LSR4312SP is connected to an AC power source, indicating the subwoofer is in “standby” status.
It is illuminated at full brightness when the subwoofer is powered up and active. The power indicator
blinks when the system volume “DIM” function is enabled by the remote control or LSR4300 Control
Center Software.
3. Power – After connection to an AC power source, press this button to turn the LSR4312SP on. If
networked together with other LSR4300 speakers, all speakers will turn on simultaneously. Press the
button again to return the subwoofer (and all other networked speakers in the system) to a stand-by
mode, where the internal amplifi ers are turned off and all user functions are deactivated. When the
subwoofer is powered on and active, the JBL logo will be brightly lit (see #2 above) and the left-most
meter segment will be lit:
4. SOLO – Press this button to solo the LSR4312SP and mute the signal on all other networked speakers.
When this function is active, the SOLO button will fl ash.
At the same time, the SOLO buttons on all other networked speakers (those that are muted) will light
steadily, and their left-most meter segments will fl ash to indicate a muted state.
Reference - Front Panel

13
To end Solo and unmute all other networked speakers, press the SOLO button again.
X All front panel button actions can be cancelled at any time simply by pressing the button a second time.
5. RMC Room Mode Correction – This button is used both to initiate an RMC calibration and to bypass
RMC settings after calibration (in order to compare the results of RMC with the uncorrected signal). RMC
calibration can only be initiated when the LSR4312SP is connected to a network that includes at least one
LSR4328P or LSR4326P speaker with the calibration microphone connected to its rear-panel input; thus,
it cannot be performed solely with an LSR4312SP alone. For information about RMC, see page 32 in this
manual. For RMC calibration procedure, consult the LSR4328P or the LSR4326P studio monitors
owners manual.
X When a brand new LSR4312SP is fi rst powered on or if its factory settings have been restored (see page 32
in this manual), or when the bass managment crossover frequency selection is changed, the RMC button lights
steadily to indicate that an RMC calibration needs to be performed.
For more information, see page 30 in this manual.
6. Bass Management ON – Press this button to turn Bass Management ON and OFF. (The button will
light steadily green when it is ON.) When bass management is on, the LSR4312SP will reproduce signal
arriving at all connected analog inputs (or at the selected S/PDIF or AES/EBU digital inputs). When bass
management is off, the LSR4312SP will reproduce only signal arriving at the analog LFE input or at the
digital input designated to carry LFE signal. For bass management to function when using a digital signal
source, the rear panel DIP switch 5 must be set to the “Bass Management” (right) position (see page 21
in this manual for more information); in that case, the LSR4312SP will reproduce signal arriving at either
or both of the selected digital input channel(s), as determined by the settings of DIP switches 3 and 4. For
more information, see Appendix A on page 34 in this manual.
X Whenever turning Bass Management ON or OFF, all networked LSR4300 speakers will fl ash their illuminated
JBL logos to indicate the change in status.
X If a second LSR4312SP is networked, turning Bass Management ON in either one will cause both to be
set identically.
7. Bass Management X OVER (Crossover) – Determines the frequency of the LSR4312SP’s lowpass fi lter
employed when bass management is ON; only signals below that frequency will be reproduced by the
LSR4312SP. When other LSR4300 speakers are networked to the LSR4312SP, their internal high-pass
fi lters will automatically be set to that same frequency; they will then reproduce only signals above the
crossover frequency.
The bass management crossover can be set to either 50Hz, 80Hz, or 120Hz. To make your selection,
press the X OVER button. It will fl ash and the meter display will confi rm the currently selected bass
management crossover setting. (Bass management will also automatically be turned ON, with the button
lit steadily). While the X OVER button is fl ashing (for approximately 3 seconds), you can use the +/-
buttons to change the crossover setting. The new selection will then be displayed on the meter display, as
shown in the following illustrations, and will be stored in the LSR4312SP after 3 seconds (or, immediately,
by pressing the X OVER button a second time within that 3-second period). For more information, see
Appendix A on page 34 in this manual.
Reference - Front Panel

14
50Hz
80Hz
X If one of the two digital inputs is selected (see #10 below), the highpass fi lters in networked LSR4300 speakers
will only be activated if the rear-panel Bass Management / LFE DIP switch is set to “Bass Management.”
X If a second LSR4312SP is networked, changing the Bass Management X OVER frequency in either one will
cause both to be set identically.
8. LFE FILTER – Determines whether the LSR4312SP’s internal lowpass fi lter will restrict the range of
frequencies reproduced when monitoring an LFE signal. Options are 50Hz, 80Hz, 120Hz, or NONE
(no fi ltering). To select one, press the FILTER button. It will fl ash and the meter display will confi rm the
currently selected fi lter setting. While the FILTER button is fl ashing (for approximately 3 seconds), you
can use the +/- buttons to change the fi lter setting. The new selection will then be displayed on the meter
display, as shown in the following illustrations, and will be stored in the LSR4312SP after 3 seconds
(or, immediately, by pressing the FILTER button a second time within that 3-second period). For more
information, see Appendix A on page 34 in this manual.
Reference - Front Panel