Dual 18 in. Bass-Reflex Subwoofer,
High Power, Vertical Orientation for
Stacking Full-Range


Dual 18 in. Bass-Reflex Subwoofer, High Power, Vertical Orientation for Stacking Full-Range Systems
The MRX528S is a portable, dual eighteen-inch, subwoofer speaker system.

  • Dual 18 inch, 2044H drivers for extended low-frequency output
  • Large vents for reduced distortion
  • Vertical orientation for convenient ground stacking
  • Tough DuraFlexT enclosure finish

  • Live performance venues
  • Mobile and fixed DJ systems
  • The MRX528S is a compact, high power subwoofer system containing dual 2044H 457 mm (18") woofer in a front-loaded, vented enclosure. The 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.

Power Rating 1000 W / 2000 W / 4000 W
Frequency Range 35 Hz - 250 Hz
(H x W x D)
1095 mm x 535 mm x 700 mm
(43 in x 21 in x 27.5 in)
Sensitivity 97 dB SPL;
103 dB SPL
Frequency Response 40 Hz - 250 Hz
Nominal Impedance 4 ohms
Rated Maximum SPL 133 dB SPL (139 dB SPL)*Calculated on half space condition
Coverage Pattern: 70º x 70º nominal
Weight 55 kg (121 lbs.)
Low Frequency Driver 2 x JBL 2044H 457 mm (18 in.) woofers