The C158 - 8 - 085 is a 5.5 inch bass - midrange driver with ultra hard ceramic dome.A FEA optimized overhung motor design with 25 mm titanium voice coil former guarantees extraordinary low energy storage and good heat transfer. The low loss rubber surround and a thin fabric spider center the moving parts with high linearity. As a typical small home stereo bass - midrange driver, we recommend our C158 - 8 - 085 for an application from 38 Hz – 3000 Hz.