For sale is a barely used JBL MRX528S Dual 18" subwoofer.  Probably used max of 10 times, and never over powered.  Works perfect, no blown drivers, just a couple of small scratches but basically brand new working order.

My loss is your gain, paid over $800 brand new.

OVERVIEW

Big power handling and flexible connections.

The JBL MRX528S is a compact, portable high-power subwoofer with dual 2044H 18" woofers in a front-loaded, vented enclosure. The JBL speaker is designed to present a minimum frontal area. It is also configured in an upright format to permit the convenient stacking of full-range enclosures on top without the need for an additional pole. The subwoofer speaker 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 JBL 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.

FEATURES

• Dual 18" 2044H drivers for extended low-frequency output
• Large vent area for reduced distortion
• Vertical orientation for convenient ground stacking
• Tough DuraFlex finish enclosure
• Applications:
• Live performance venues

SPECIFICATIONS

MRX528S Dual 18" Subwoofer

• Frequency range: 35Hz-250Hz
• Frequency response: 40Hz-250Hz
• Sensitivity: 97dB SPL; 103dB SPL
• Nominal impedance: 4 ohms
• Power capacity (continuous/program/peak): 1000W/2000W/4000W
• Rated maximum SPL: 133dB SPL (139dB SPL)*
• Coverage pattern: 70° x 70° nominal
• Dimensions: 21"W x 43"H x 27.5"D
• Weight: 121 lbs.