QTX QS Series Replacement Drivers - 15" for QS15 and QS15A speakers. This is a range of chassis speakers designed to replace the main driver in QTX Sound QS series speakers. Specifications: Impedance: 8 Ohms Power max: 700W Power rms: 350W Dimensions: 17.00cm x 17.00cm x 40.00cm Weight: 4.55kg