JBL SRX728S Dual 18" Subwoofer  

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The JBL SRX728S Dual 18" Subwoofer is built to deliver smooth, clean, accurate low-end. With a pair of 18" Differential Drive woofers, it handles an amazing 1600W power (continuous). Large, open ducts... Click To Read More About This Product

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The JBL SRX728S Dual 18" Subwoofer is built to deliver smooth, clean, accurate low-end. With a pair of 18" Differential Drive woofers, it handles an amazing 1600W power (continuous). Large, open ducts minimize port turbulence and the heavily braced JBL enclosure assures tight, solid bass response. Designed to present a minimum frontal area, the subwoofer enclosure offers complete input connection flexibility with 2 Neutrik Speakon jacks. A recessed, external switch allows selection of either contacts +1/-1 or +2/-2 while an internal connector allows you to drive each woofer from a separate amplifier channel. The speaker cab is constructed of top-quality birch plywood and coated in rugged DuraFlex. Each woofer is housed in an isolated chamber and the enclosure is heavily braced to maximize low-frequency performance. The attractive CNC machined, 16-gauge steel grille is internally lined with acoustically transparent foam to provide the JBL SRX728S with additional driver protection and a very professional appearance. This subwoofer excels when paired with the PA speakers (sold separately).

  • High-power subwoofer
  • 2 - 2268H Differential Drive, neodymium magnet, 18" woofers
  • Power Rating (Continuous/Program/Peak): 1600W/3200W/6400W
  • Front-loaded vented enclosure
  • 2 Neutrik Speakon NL-4 connectors
  • External switch selects either contacts +1/-1 or +2/-2
  • Internal connector separates each woofer into 2 channels
  • Birch plywood construction
  • Heavily braced
  • Rugged DuraFlex finish
  • Isolated chamber for each woofer
  • Frequency Range (-10 dB): 27Hz”220Hz
    Frequency Response (±3 dB): 33Hz”220Hz
    Input Connection Modes: Switchable, +1/-1 or +2/-2; Internally selectable, Parallel or Discrete
    Recommended Crossover Frequencies: 80Hz, 24dB/octave HPF; 80Hz, 24dB/octave LPF
    Power Rating (Continuous/Program/Peak): Parallel: 1600W/3200W/6400W
    Maximum SPL: 136dB SPL peak
    Sensitivity (1w @ 1m): 98dB SPL
    LF Driver: 2 x JBL 2268H 18" Differential Drive woofer with neodymium-magnet and dual voice-coils
    Nominal Impedance: 4 ohms parallel; 8 ohms x 2 active discrete
    Enclosure: Rectangular, 18mm, 13-ply birch plywood
    Finish: Black DuraFlex finish
    Grille: Powder coated, black, 16-gauge perforated steel with acoustical transparent charcoal foam backing.
    Dimensions: 42"W x 23-3/4"H x 33"D
    Net Weight: 166-1/2 lbs.
  • Customer Reviews

Review Snapshot

by PowerReviews

(based on 4 reviews)

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Reviewed by 4 customers

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(21 of 21 customers found this review helpful)


Great For Night Clubs & Live Sound NOTHING BETTER

By Khyyam Cooper

from Denver,Colorado

I use these subs in all the night clubs i design and build systems for. I chose these speakers because I have some for my DJ rig also. The system I did for Club Posh (Denver) has 5 of these on the main dance floor with 6 JBL SRX-725s flying from the ceiling. We used 8-Crown XTi-4000s and a DBX-Driverack. When i calibrated the system i used Hip-Hop, Metal, Country, R&B, Classical, Classic Rock, and jazz to test the different acoustical qualities of the speakers and they reproduced them FLAWLESSLY!!! The JBL/Crown system in Club Posh is by FAR one of the BEST sounding systems in Denver. People are constantly complimenting us on the sound there. I have a smaller set up just like the club for when I Dj and I have yet to hear other DJs with a system that compares..BUY THEM you wont regret it!!!

(15 of 17 customers found this review helpful)


Feel the bass in your bones!

By gguillo

from Little Rock, AR

Pair two of these with the JBL SRX 722's or the JBL 725's and you have a killer rig! This cabinet has monster power for any occasion or room. Amazing throw and distance allow the bass to be heard and felt from anywhere. You need some serious amp power to run these. I would recommend bridging a Crown XTI 4000, or QSC 3602 at the least, but would most likely use a bridged Crown XTI 6000, the new Crown I-Tech 8000, or a Crown Macrotech 5002 to really make these rattle! For more power and clarity, I would run these on a 3-way system.

(28 of 30 customers found this review helpful)


Impressive Still.


from Tulsa, OK

My current rig uses six of these guys with six of the SRX 725 Tops. I have worked with almost every brand and type of speaker on the market as a FOH engineer and can honestly say I will never invest my money in any other brand. JBL continues to dominate the market. Looking forward to getting my new VRX tops, but sticking with the raw power and perfectly designed SRX subs.

(25 of 26 customers found this review helpful)


This has got to be the best sub I've ever heard...

By adrian

from Undisclosed

Recently I got two of these subs with another pair of SRX725's and they've got to be the best, most accurate subs I've ever heard. I tri-amped the system as to be more effeciant, and lows were crystal clear.

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