ECX-570.5 - Hertz 5" x 7" 105W RMS 2-Way Energy Series Coaxial Speaker ECX-570.5 - Hertz 5" x 7" 105W RMS 2-Way Energy Series Coaxial Speaker Power Rating: 210W Max Water-repellent treated paper cone, butyl rubber surround. Pure copper voice coil wound on aluminum former, for very good thermal and mechanical capacity. Mounting Depth: 2.56"