JBL LSR4312SP, Owner'S Manual

Page: 8 / 61

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