Crossovers and Controllers

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.

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

JBL DSC260 (front / back)

		CLIP	LIMIT	LIMIT	LIMIT	LIMIT	LIMIT	LIMIT	STORE	PARAMETER	ACCESS
									(ENTER)
		+6dB	-3dB	-3dB	-3dB	-3dB	-3dB	-3dB
		0dB	-6dB	-6dB	-6dB	-6dB	-6dB	-6dB		LAST	NEXT
		-6dB	-20dB	-20dB	-20dB	-20dB	-20dB	-20dB

DSC 260		-12dB	MUTE	MUTE	MUTE	MUTE	MUTE	MUTE	RECALL
	A	B
				2	3	4	5	6
		INPUT	1
DIGITAL SYSTEM CONTROLLER

MAIN SUPPLY

AC 50/60Hz @ 30Watts

WARNING!

THIS EQUIPMENT

MUST BE EARTHED

FUSE

T160MA 23DV

DSC260

MADE IN THE UK

CONTROLLER INTERFACES

RS232	MIDI OUT MIDI THRU MIDI IN

FLOATING BALANCED OUTPUTS

BALANCED INPUTS

dbx® DriveRack™ PA (front / back)

CROSSOVER/ALIGNMENT DELAY/GRAPHIC EQ/PARAMETRIC EQ/AUTO/EQ

JBL SR-X Series manual Crossovers and Controllers, Digital System Controllers

Models: SR-X Series