JBL SRX700 Recommended Amplifier Power, Infrasonic Filter Settings, Processor Tunings

SRX728S - Dual 18¨, bass-reflex, subwoofer

Frequency Range (-10 dB):	27 Hz - 220 Hz
Frequency Response (±3 dB):	33 Hz - 220 Hz
Input Connection Modes:	Switchable, +1/-1 or +2/-2 Internally Selectable, Parallel or Discrete
Recommended Crossover Frequencies:	HPF: 80 Hz, 24 dB/octave LPF: 80 Hz, 24 dB/octave
Power Rating (Continuous¹/Program/Peak):	Parallel:	1600 W / 3200 W / 6400 W
Maximum SPL²:	136 dB SPL peak
Sensitivity (1w @ 1m):	98 dB SPL
LF Driver:	2 x JBL 2268H 457 mm (18 in) Differential Drive® woofer with neodymium-magnet and dual voice-coils
Nominal Impedance:	Parallel:	4 ohm
	Discrete:	8 ohms x 2
Active Tunings:	dbx DriveRack, all models. Settings available at www.jblpro.com
Enclosure:	Rectangular, 18 mm, 13-ply birch plywood
Finish:	Black DuraFlex™ finish
Grille:	Powder coated, black, 16-gauge perforated steel with acoustically transparent charcoal foam backing.
Input Connectors:	Neutrik® Speakon® NL-4 (x2)
Dimensions (H x W x D):	602 mm x 1067 mm x 838 mm (23.7 in x 42 in x 33 in)
Net Weight:	76 kg (166.5 lb)
Optional Accessories:	SRX728S-CVR: Pull-over padded cover

¹40 Hz - 120 Hz pink noise with 6 dB crest factor. ² Calculated based on power rating and sensitivity.

	Recommended Amplifier Power			Infrasonic Filter
				Settings
Model	Full-Range / Parallel	HF	LF / Discrete	HPF 24 dB/ octave
SRX712M	800 to 1,600W@8Ω	150 to 300W@8Ω	800 to 1,600W@8Ω	50 Hz
SRX715	800 to 1,600W@8Ω	150 to 300W@8Ω	800 to 1,600W@8Ω	40 Hz
SRX722	1,200 to 2,400W@4Ω	150 to 300W@8Ω	1,200 to 2,400@4Ω	63 Hz
SRX725	1,200 to 2,400W@4Ω	150 to 300W@8Ω	1,200 to 2,400W@4Ω x2	31 Hz
SRX738	800 to 1,600W@8Ω	350 to 700W@8Ω	800 to 1,600W@8Ω	31 Hz
SRX718S	800 to 1,600W@4Ω	n/a	800 to 1,600W@2Ω	31 Hz
SRX728S	1,600 to 3,200W@4Ω	n/a	800 to 1,600W@8Ω x2	31 Hz
Infrasonic Filter Settings
It is a good practice to use a High Pass Filter (HPF) to prevent frequencies below the system tuning frequen-
cy from reaching the speaker. Inputting these frequencies to the speaker will not result in any appreciable
acoustic output but will put needless mechanical stress on the woofer and reduce available amplifier head-
room. A High Pass Filter will protect your SRX700 system from excess infrasonic energy with little, if any
loss of significant program content. Refer to the above chart for infrasonic filter settings.
Processor Tunings
System tunings for dbx DriveRack processors have been developed for the SRX700 series. If your
DriveRack was manufactured prior to the release of SRX700, you may obtain the settings from the dbx web-
site at http://www.dbxpro.com/downloads.htm, or from the JBL Pro website at www.jblpro.com/pages/soft-
ware_downloads.htm. The tunings are available in digital format and may be loaded directly into your
DriveRack processor (except DriveRack PA).
The settings are also provided in a .PDF document for owners of the DriveRack PA. For other processors or
for analog crossovers and equalizers, the PDF tunings may be used as a starting point. Be aware that all
digital processor models may not respond identically to a particular setting.
DuraFlex™ Finish
The DuraFlex finish used on your SRX700 series speakers is one of the most rugged finishes ever applied
to a speaker. However, all speaker finishes are subject to damage. Should the DuraFlex finish require repair,
a touch-up kit (Part Number 30052) is available from JBL Professional Parts.
Removable JBL Logo Badge					7
For applications requiring a more unobtrusive appearance, the JBL badge may be peeled off exposing a
JBL logo that is cut into the grille. Note that the badge may not adhere properly if reattached.