CROSSOVERS AND CONTROLLERS
Digital System Controllers
Digital signal processing technology has made it possible to build sophisticated loudspeaker system controllers
that incorporate into a single unit, the ability to control crossover frequencies, slopes, and filter topology. In
addition, these units may include graphic and parametric equalization, time / phase alignment, and compression /
limiting. Some of these digital system controllers include factory-programmed presets for SR-X series
loudspeakers. As this manual goes to press, these controllers include the JBL DSC260, and the dbx®
DriveRack™ and DriveRack™ PA products.
If you are using a digital system controller that does not include pre-programmed presets for SR-X series loud-
speakers, it may be useful to review the JBL DSC260 settings as a starting point for programming your controller.
A PDF download detailing these settings may be found at www.jblpro.com/pages/tunings/ srx_dsc260.pdf.
Note that various processors will respond to these settings in different ways, so you will probably need to refine
your settings by ear or with the help of acoustical measurement equipment.
As with any software driven device, it is always good practice to check with the manufacturer of your digital
system controller for updates. JBL will also attempt to post notifications of any new developments at
www.jblpro.com
11
DSC 260
DIGITAL SYSTEM CONTROLLER
ACCESS
LAST
NEXT
PARAMETER
STORE
(ENTER)
RECALL
MUTE
1
MUTE
MUTE
MUTE
MUTE
MUTE
5
4
3
2
6
LIMIT
-3dB
-6dB
-20dB
LIMIT
-3dB
-6dB
-20dB
LIMIT
-3dB
-6dB
-20dB
LIMIT
-3dB
-6dB
-20dB
LIMIT
-3dB
-6dB
-20dB
LIMIT
-3dB
-6dB
-20dB
INPUT
A
B
CLIP
+6dB
0dB
-6dB
-12dB
CROSSOVER/ALIGNMENT DELAY/GRAPHIC EQ/PARAMETRIC EQ/AUTO/EQ
SR-X series loudspeakers may be operated in bi-amplified mode. In this mode, all crossover components are
bypassed (except in the case of the three-way SR4732X and SR4735X) and the voice-coils of the drivers are
connected directly to the power amplifier outputs. When operated in this manner, an external, electronic
crossover is required. Such crossovers may be cards or modules that can be installed in the power amplifiers or
may be separate processors.
SR-X series speakers include CD (constant directivity) horn designs. A characteristic of this type of horn is that it
requires a power response correction consisting of a 6 dB per octave rise beginning at approximately 4 kHz. This
power response correction is built into the passive networks of SR-X series speakers. When used in bi-amp
mode, the power response correction must be provided by the electronic crossover. Most analog crossovers will
include a "CD Horn EQ" function.
BALANCED INPUTS
B
A
1
6
5
4
3
2
FLOATING BALANCED OUTPUTS
MAIN SUPPLY
AC 50/60Hz @ 30Watts
FUSE
T160MA 23DV
WARNING!
THIS EQUIPMENT
MUST BE EARTHED
RS232
CONTROLLER INTERFACES
MIDI OUT
MIDI THRU
MIDI IN
MADE IN THE UK
DSC260
JBL DSC260 (front / back)
dbx® DriveRack™ PA (front / back)
