DAYTON TITANIC MK III SUBWOOFER - 4 OHM - 12" Overview The Dayton Audio TS320D-4 12" subwoofer driver is the Mk 4 version of the incredibly successful Titanic Series. This USA-made driver features a stronger motor than the Mk III version for faster response and a more musical sound. Highlights - A stronger motor than the Mk III gives the Mk IV better control - American-made, muscular subwoofer performance - Shares the same dimensions as the Titanic Mk III for a true drop-in upgrade Dayton Audio TS320D-4 12" Titanic Mk 4 Subwoofer 4 Ohm Dayton Audio's Titanic series subwoofers are world-renowned for their ability to create deep, hard-hitting bass with minimum distortion. This line of subwoofers has always been known for prodigious amounts of Xmax, relatively high sensitivity specifications, and an amazing ability to handle power. Dayton Audio takes everything that has made the Titanic subwoofers stand out as top-of-the-line subwoofers in the loudspeaker industry and improves upon them in the Mk 4 generation. The TS320D-4 12" Titanic Mk 4 subwoofer has been redesigned from the ground up to improve upon every aspect possible, while maintaining the essence of the Dayton Audio Titanic series.