QSC AD-S28Tw-BK 
Features
Dual 8-inch polypropylene cone woofers
Large port area for extended low-frequency performance
Dual-chamber ported bandpass cabinet
Defeatable passive 120 Hz low-pass filter with impedance compensation
250 watts continuous power handling, 700 watts peak
70/100 V multitap transformer with 8 ohm bypass
Yoke mount and flying hardware included
Marine grade plywood construction
Package Includes: AD-S28Tw loudspeakerYoke mountSuspension hardware kitGrille backing cloth