Bose EdgeMax EM90, Loudspeaker for Ceiling Installation, PhaseGuide technology, Nominal horizontal dispersion angle of 90°, High frequency compression driver, 8"" Woofer supports boundary loading close to the wall, 2-Way passive crossover with transformer for 70 V / 100 V audio systems, Spring-loaded brackets with snap-in function, Magnetically fixed grille, Certified according to UL1480A, Frequency response (+/- 3 dB): 50 Hz to 18 kHz, Frequency range (-10 dB): 45 Hz to 20 kHz, Nominal dispersion: 75° Vertical, 90° horizontal, Continuous power rating: 125 W (500 W peak), Sensitivity (SPL / 1 W at 1 m): 96 dB SPL, Max. SPL at 1 m: 117 dB SPL (123 dB SPL peak), Drivers: 1 x 20 cm woofer, 1 x compression driver, Nominal impedance: 8 Ohm (transformer-bridged), Colour: White