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JBL Professional MRX528S Dual 18" Subwoofer Speaker System

JBL Professional is constantly pushing the threshold for better, more useful products for the working musician and DJ and once again JBL Professional hits the target with their MRX500 Series loudspeakers. The MRX500 delivers outstanding performance for the DJ and musician where a smaller, lighter, more portable system is required with no sacrifice in sound quality or durability. Up to 30% lighter than comparable systems, the MRX was designed from the ground up utilizing JBL's Differential Drive® transducer technology. Specifically engineered for MRX and completing the design, a series of rugged plywood enclosures, covered with JBL’s DuraFlex™ finish, a tough, textured scratch resistant surface, that ensures years of solid performance and professional good looks.

The MRX528S is a portable, high power, dual 18" bass-reflex subwoofer in a vertical orientation and with a top pole mount socket for stacking full-range systems that's ideal for live performance venues as well as mobile and fixed DJ systems

The MRX528S front-loaded, vented enclosure is designed to present a minimum frontal area. It is also configured in an upright format to permit the convenient stacking of fullrange enclosures on top without the need for an additional pole. The system offers complete input connection flexibility for compatibility with a variety of cabling schemes. The input panel incorporates a pair of Neutrik® Speakon® NL-4 connectors wired in parallel. The MRX528S is supplied with pins +1/-1 connected to the woofer. This may be easily reconfigured to work with cabling systems intended to drive subwoofers on pins +2/-2. The enclosure is constructed of quality plywood, coated in JBL’s rugged DuraFlex™ finish and is braced to maximize low-frequency performance. The attractive CNC-machined, 16-gauge steel grille is internally lined with an acoustically transparent screen to provide additional driver protection and give a very professional appearance.


  • 400W continuous, 800W program, power handling.
  • Vertical orientation for convenient ground stacking.
  • Dual 18" 2044H driver for extended low-frequency output.
  • Large vent area for reduced distortion.
  • Top mounted 35 mm socket for optional SS3-BK pole.
  • Non resonant all steel carrying handles.
  • 16-gauge perforated steel grille with internal accoustically transparent lining.
  • Rubber feet.
  • Tough DuraFlex™ enclosure finish.

Detailed Features

Subwoofer and Slave on Pole

Pole Mount Facilities

The MRX528S has a 35mm pole mount socket in the top of the cabinet to allow a MRX515 or RX512M to be supported above the subwoofer. Elevating your speakers on a tripod stand or pole is a great idea. But, if you raise the speaker too high, half the output hits the back wall causing unwanted acoustic effects. Leave the speaker too low, and the crowd down front gets blasted while those in the rear can't hear. The solution - a pole-mount with two sockets so you have the option of mounting your MRX515 or MRX512M with a 10ş down angle. The result - more uniform coverage of your audience and less energy wasted hitting the walls. Of course you can still use the other socket to position your speakers with no down angle.



The MRX528S is a compact, high power subwoofer system containing dual JBL 2044H 457 mm (18") woofers in a front-loaded, vented enclosure.

JBL 2044H Subwoofer Speaker

100 Hour Torture Test

Like all JBL Professional products, the MRX Series is brutalized in JBL’s speaker torture test. Unique in the industry, the JBL torture test submits each component in the MRX Series to 100 hours of continuous, high level input, ensuring that the MRX will deliver its extraordinary sound even after years of tough handling and thousands of hours of performance.

Technical Specifications

System Type Dual 18" high power bass-reflex subwoofer speaker
Impedance 4 ohms
Frequency Response 45 Hz to 250 Hz (+/- 3 dB)
HF Dispersion n/a
Crossover Frequency n/a
Crossover Mode n/a
Sensitivity @ 1W/1M 97 dB SPL
Maximum SPL 133 dB SPL continuous, 139 dB SPL peak.
Power Handling Continuous 800W
  Program 1600W
  Peak 3200W
High Frequency Driver n/a
Low Frequency Drivers JBL 2044H 457mm (18") woofer.
Input Connectors Neutrik® Speakon® NL-4 (x2)
Construction Rectangular, 18 mm, plywood.
  Black DuraFlex™ finish.
  Black, powder coated, 16 gauge perforated steel grille with acoustically transparent black screen backing.


Width ..... 516 mm
Depth ..... 597 mm
Height ..... 597 mm
Weight .... 40.4 Kg
  JBL MRX528S Dimensions

Ordering Information

Description Order Code
JBL MRX528S Dual 18" Subwoofer Speaker JBL-MRX528S
JBL 35mm SS3-BK pole JBL-SS3-BK
The information presented on this page is provided by courtesy of JBL Professional.
Revised: 22-Dec-2010 Copyright (C) 2010 Adena Limited