TITANAX15 Speakers . 15 inch speakers have larger drivers, a bigger voice coil and physically push more air through the woofers. As a result they have a higher sound pressure level than their 12 inch counterparts, and also reach lower bass frequencies. Designed to perform in portable and fixed installation applications alike TITANs, with their ultra-lightweight composite enclosure, offer a range of mounting options including tripod floor stands, wall mounting brackets or even on .