2” Throat Bolt-On Compression Driver 320 Watts With 2” Titanium Voice Coil 8-OhmDS18s PRO D22Ti. 8 is the only choice for those who demand the best from their systems. Its 2" throat diameter ensures maximum sound projection so your music reaches every corner of the venue. The bolt on installation type guarantees hassle free setup so you can focus on getting LOUD! With a nominal impedance of 8 Ohms and an AES power handling capability of 160W, DS18s PRO D22Ti. 8 is built to integrate easily into the most demanding audio setups.