The P.Audio XT-15A-SUB is a powered 15-inch subwoofer system featuring a dual-channel amplifier - One amp channel powers its 15-inch woofer and its other amp channel powers the 3Line-C or other passive speakers. The XT-15A-SUB also features a powerful DSP section that provides switch selectable presets for the 3Line-C or other speakers, plus all its performance parameters, including EQ, input / output delays and dynamics processing can be controlled in real-time via RS485 on a PC. The XT-15-Sub's DSP section also features the capability to save custom created system EQ and processing settings.The XT-15A-SUB's enclosure is made of strong 13-ply birch plywood covered in a scratch-resistant polyurea coating. It is equipped with comfortable recessed handles and has an M20-sized screw-on pole mount socket. The XT-15A-SUB provides solid bass output and can deliver 130 dB of output capability. The XT-15A-Sub's power, sound and flexibility make it a solid subwoofer value.