These JBL Stage3 527 speakers are 5-1/4 inch two-way coaxial drivers featuring an injection molded polypropylene woofer cone and a dedicated tweeter for extended high frequencies. They handle 35W RMS and 105W peak, reproduce 70 Hz to 20 kHz with 91 dB sensitivity and a nominal impedance of 4 ohms, and connect via standard speaker terminals for installation in compatible factory 5-1/4 inch openings.