AudioSource AST-SUB10 150-Watt Powered Subwoofer with 10" Woofer (Single Speaker) (Discontinued by Manufacturer) Low-profile, powered subwoofer with 10-inch down-firing aluminum-cone woofer 150-watt amplifier with auto-on signal-sensing circuit Continuously variable low-pass filter (50 to 180 Hz) for matching the sub's sound with your other speakers Offers line-level inputs, crossover bypass switch (for use with LFE receiver outputs), adjustable volume control. and phase switch Measures 19.6 x 8.3 x 15 inches (W x H x D) without spikes