Earthshaking Bass Meets Comprehensive System Control The RCF SUB 18-AX is not only a muscular-sounding powered subwoofer, but thanks to its built-in DSP and convenient remote control, it also makes a powerful central hub for your entire system. The SUB 18-AX pumps a brawny 2,200 watts through a high-power 18-inch woofer, yielding subterranean low end down to 35Hz with a rafter-shaking 135dB maximum SPL. Meanwhile, you'll find the subwoofer's digital crossover and convenient speaker presets handy, in addition to its intuitive, full-color touchscreen interface. You also get RCF's revolutionary Bass Motion Control, which provides exacting woofer excursion management. The SUB 18-AX pairs seamlessly with the LiveRemote smartphone app via Bluetooth, providing you with robust multifunctional control over your setup along with effective digital tools for tuning and optimization. Complete with a rugged polyurea-coated multi-ply hardwood cabinet, the RCF SUB 18-AX combines premium low-frequency extension and comprehensive system control into a