REL - T-9 10" Powered Subwoofer Gloss Black Power rating: 300W (RMS) class AB amplifier Input impedance: 150k ohms (high level) / 10k ohms (low level) Woofer: 10" long-throw woofer / 10" passive radiator Fully electronic SET-SAFE Low-end frequency response: 28Hz @ -6dB in room