In Phase XT range is legendary, renowned for making high quality woofers that sound bigger than they actually are; The new XT-12 has raised the bar for all subwoofer and out performs many of its rivals for, SPL, Sound Quality and outright Performance. If you are looking for the perfect subwoofer that you can have years of enjoyment from then the XT12 is your Subwoofer. 1400 Watts, Single piece woven Kevlar fibre Cone (Same stuff as bullet proof vest). 2 4 Layer high grade aluminium voice coil, with a 90oz Double stacked magnet. Double Spider for insane woofer control. 1400 watts RMS. 1400 watts max output. Mounting depth 16cm. Size 30cm.