Cambridge Audio Minx X200 Subwoofer, High Gloss Black Power Output: 200W rms Frequency Response: 39Hz (-6dB) - 200Hz Crossover: Active - variable 50Hz-200Hz Drive units: 1 x 6.5" subwoofer, 2 x 6.5" passive radiators Dimensions (H x W x D): 8.6 x 8.3 x 8.7"