Do not be deceived by familiar looks. The Titan 15Z may appear cosmetically to be the same as our Titan X15 - but, it is what is inside that matters. Titan 15Z features extreme power handling transducers with high electrical sensitivity. This results in unimaginable power handling specifications and remarkable SPL. Custom built Wharfedale Pro drivers are what makes this possible. The 15Z features an enormous 4" LF voice coil for breath-taking power handling capabilities along with an enhanced compression driver with a 2" coil.