PRV Audio 15W1600 15" High Power PA Woofer 8 Ohm Extreme forced-air cooling system for hours of use without failure 4&quot; voice coil on a Kapton former for 800W of power handling 7.6 mm of Xmax and a low Fs for playing below 40 Hz with authority Ribbed paper cone captures that &quot;classic tone&quot; of high-end speakers High 97 dB sensitivity