Cambridge Audio Minx X300 Subwoofer, High Gloss White Power Output: 300W rms Crossover: Active - variable 50Hz-200Hz Frequency Response: 33Hz (-6dB) - 200Hz Drive units: 1 x 8" subwoofer, 1 x 8" passive radiator Speaker Dimensions (H x W x D), 12.4 x 10.5 x 11.0"