REL - T-Zero - 6.5" Powered Subwoofer High Gloss White Power rating: 100W (RMS) class D amplifier Input impedance: 150k ohms (high level) / 10k ohms (low level) Woofer: 6.5" long-throw woofer Fully electronic SET-SAFE Low-end frequency response: 38Hz @ -6dB in room