The STEG BZ40DII is a set of 4-inch coaxial loudspeakers specifically designed for seamless integration into Mercedes-Benz C, E, S, and GLC class vehicles. These speakers are built for a plug-and-play installation, allowing you to replace factory units in their original locations without complex modifications. They feature a two-band system with a 100mm midrange speaker and a water-repellent paper membrane, which helps produce a clear and natural sound regardless of humidity levels. Technically, these drivers operate with a nominal impedance of 4 Ohm and deliver 30 W RMS power, reaching a peak of 60 W. The frequency response ranges from 110 Hz to 20,000 Hz with a sensitivity of 86 dB. To ensure efficiency and strength, the design incorporates a neodymium magnet and an aluminum diffuser, all housed within a stamped steel basket. With a mounting diameter of 101 mm and a high-frequency mounting depth of 42 mm, they fit precisely into the intended vehicle interiors for a clean, professional finish.