Definitive Technology Mythos SSA-50: Single speaker surround solution Single solo surround array loudspeaker Three 4.5-inch BDSS high-output drivers with coincident array 1-inch ferro-magnetic fluid damped pure aluminum dome tweeter Two 4.5-inch BDSS high-output full-range drivers Four 3.25-inch full-range high-output surround drivers with butyl rubber surrounds Frequency response: 50Hz - 30kHz