The SRX728S is a high power subwoofer system containing two neodymium magnet, patented* Differential Drive®, 18" woofers in a front-loaded, vented enclosure.

Description:
Frequency Range(-10db): 27hz-220hz
Max. SPL/1m(calc. ) :136dB
Power Handing: 1600W4ohms
LF transducer:dual 18'' cone Driver
Sensitivity:98dB
Dimension: 602*1067*838mm
Weight:76kg
Connectors: Neutrik® Speakon® NL-4 (x2)  
Enclosure material/finish: 18mm Seabrichen Plywood