Dap Audio Compression Driver, designed to be fitted to a horn flare with a 1⅜" screw thread. Titanium Diaphragm, Kapton Bobbin and a Copper Clad Aluminium Voice Coil. The driver must be connected via a suitable audio filter or crossover. For optimum performance and reliability the compression driver should be supported in the cabinet, to relieve the weight on the horn flare. Replacement Voice Coil 200-480 is available.