QSC KLA181-BK 
Features
1,000 watt power module
18-inch vented subwoofer
High acoustic output (135 dB SPL peak)
Frequency range down to 33 Hz (-10 dB)
Extensive DSP further enhances and protects performance
powerCON® Input and Thru connections
Threaded pole receptacle for free-standing applications (black models only)
Suspension made possible via M10 fittings or KLA12AF Array Frame
Integrated threaded pole mount supports up to two KLA12 enclosures (black models only).