HD Series powered subwoofers provide intense low-frequency extension at unmatched power levels, adding massive low-end to any system. Designed and tuned by the experts at EAW, HD Series subs incorporate premium Linkwitz-Riley crossover, precision tuning filters and phase alignment for ultra-accurate bass response. The all wood cabinets feature a ported, direct radiating design for chest-pounding punch, while the Class-D amplifiers and switching power supply mean less weight and maximum efficiency. The HD1501 is ultra-compact for portable applications and the powerful HD1801 is even flyable, providing the perfect sub for installs that need to save valuable stage space. Pair them with HD Series Powered Loudspeakers for an extremely powerful and fully high-definition PA solution.