Dual 15" Two-Way Portable Speaker System Includes two 15" Woofers; a 1" Titanium Diaphragm, Fluid -Cooled Compression Driver Mounted on a Progressive Transistion™  Waveguide;  Sonicguard™ High Frequency Protection;  Carpet Covered , Trapezoidal Enclosure; 3/4" MDF Construction;  18 Gauge Steel Grille;  Steel Handles; Neutrik®  SpeakOn® and 1/4" Input.