Acclaim 7 series feature baffles that are more rigid than previous speaker models. Increased baffle rigidity allows for better bass and improved midrange detail while reducing resonance and eliminating unwanted vibrations. 38 Hz to 20 kHz and -6 or +/-3 dB frequency response. 6 ohms nominal impedance. 10 to 85 W per channel power. 91 dB SPL 2.83 V at 1 m sensitivity. Polypropylene cone woofer. Pivoting 1 inch silk tweeter. Spring terminals.