Portable Sound EON 300 : EON 500  : JRX  : MRX500 Series : PRX500 Series : PRX600 Series : SRX700 Series : VRX       MRX528S Dual 18 in. Bass-Reflex Subwoofer, High Power, Vertical Orientation for Stacking Full-Range Systems   Brochure User's Guide Spec Sheet Hi-Res Image The MRX528S is a portable, dual eighteen-inch, subwoofer speaker system. Features :   Specifications : 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   Power Rating   :   1000 W / 2000 W / 4000 W Frequency Range   :   35 Hz - 250 Hz Dimensions (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 Applications : 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.