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.

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JBL SRX700 manual SRX728S Dual 18¨, bass-reflex, subwoofer, Recommended Amplifier Power Infrasonic Filter Settings
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SRX700 specifications

The JBL SRX700 series is a line of professional loudspeakers that has been designed for a variety of applications, including live sound reinforcement, installations, and portable use. Known for its high-performance capabilities, the SRX700 series delivers exceptional audio quality and durability, catering to the needs of sound engineers and audio professionals alike.

One of the standout features of the JBL SRX700 series is its advanced transducer technology. Each speaker is equipped with JBL’s proprietary components, including high-performance woofers and compression drivers. This ensures that users experience a wide frequency response with minimal distortion, allowing for crisp highs and deep, powerful lows. The series is designed to deliver a maximum SPL (Sound Pressure Level) that is suitable for large venues, making it an ideal choice for concerts, festivals, and corporate events.

The SRX700 series incorporates JBL’s DuraFlex™ finish, which is a rugged, protective exterior designed to withstand the rigors of touring and installation. The cabinets are made from high-quality plywood, which contributes to the durability of the speakers while reducing unwanted resonance that can color the sound. Each model is also equipped with integrated rigging points, allowing for easy suspension in a variety of configurations.

Another key technology in the SRX700 series is the built-in digital signal processing (DSP). This feature enables users to fine-tune the audio performance through advanced algorithms, providing presets that enhance the acoustics depending on the venue and application. The DSP also includes EQ adjustments, time alignment, and crossover settings, ensuring optimal audio output that meets the specific needs of any sound system.

The series consists of various model options, including both active and passive configurations. The active models come with built-in amplifiers that precisely match the speakers’ specifications, ensuring efficient power management and performance consistency. The passive models allow more flexible integration with existing sound systems, making the SRX700 a versatile choice for diverse sound reinforcement applications.

In conclusion, the JBL SRX700 series combines advanced transducer technology, durable construction, and sophisticated digital signal processing to deliver high-quality audio performance. Its flexibility and reliability make it a popular choice among audio professionals looking to elevate their sound reinforcement capabilities. Whether used for live events or installed systems, the SRX700 series is engineered to meet the demands of even the most discerning listeners.
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