Bass_boost, portable, Part of Electro Voice s Live X series portable ELX118P active sub features latest Electro Voice engineered 18 woofer. With generous 700W Class D high efficiency amp 134dB SPL output 42Hz 100Hz frequency response you ll be able to shake rattle roll crowd with aurally pleasing low end. It also features XLR combo jack XLR link output as well as easy to use controls. The ELX118P is constructed of 9 ply 15mm plywood is internally braced making it sturdy ye, usb_port