LF Pressed Chassis / Ferrite. 4" mid-range driver providing 90 dB sensitivity and 30 Wrms (AES standard) power handling. 1" high temperature copper voice coil wound on polyimide former for increased reliability. Very compact model suitable for use in 3-way systems. Optimised to deliver detailed reproduction of mid-range frequencies. Closed back chassis simplifies cabinet manufacture, eliminating need for separate mid-range enclosure.