Soundsphere Q-12A Loudspeaker in White, 500W Max. Program Power, 250W Max. Continuous Power RMS, Nominal Impedance 8 ohms, High sensitivity (94 dB 1 W/1 m), High SPL capability (118 dB 1 m) 500W Max. Program Power, 250W Max. Continuous Power RMS Nominal Impedance 8 ohms, High sensitivity (94 dB 1 W/1 m) Accurate, full-range voice announcements Enhanced high-fidelity music reproduction Exclusive patent-pending Poly-Exponential Incidence Reflector