A new version of Morel's classic MDT-30, the CAT308 is a very fast tweeter capable of high dynamic range without SPL compression. It features a single magnet system vented into a damped rear chamber that lowers resonance. The ferrofluid cooled aluminum voice coil contributes to the CAT308's low distortion and exceptionally smooth response. 1-1/8" treated soft dome. Replacement diaphragm .