Boston Acoustics Horizon Series HPS12HO Subwoofer (Midnight) (Discontinued by Manufacturer) Frequency Response (3dB) - 25Hz-150Hz Bass Unit - 12 (305mm) DCD Subwoofer Crossover - 40Hz-180Hz 24dB/octave low-pass Amplifier Power - 300-Watts RMS Dimensions - Height 17-5/8 x Width 17-5/8 x Depth 13-5/8 (445x445x345mm)