Instead of using the entire left and right set, use only the necessary units where needed. This approach elevates the overall system's quality. This is a sophisticated upgrade that's perfect for those who want to: enhance the amount of information in the center, position vocals more realistically, or improve the blurry sound image of the original speakers. *Includes original speaker cable adapter. Speaker type: SET COAX 2Way 100mm for BMW LargeBasket. Frequency response: 100Hz-22kHz. Rated input: 40W. Input impedance: 4Ω. Output sound pressure level: 88dB/SPL. Mounting hole diameter: 91mm. Mounting depth: 44.5mm.