Yamaha NSIC600WH 6-1/2" 2-Way In-Ceiling Speakers (Pair/White) These in-ceiling speakers feature moisture-resistant 6-1/2" polypropylene mica woofer cones for enhanced mid-low sound reproduction. The 1" swivel tweeter lets you precisely aim high frequencies for optimal sound output. Speaker Type In-Ceiling, PAIR Crossover Type-2-way Maximum Frequency Response-28 kHz; Crossover Frequency-3.20 kHz RMS Output Power-110 W; Sensitivity 90 decibels Impedance-8 Ohm Tweeter Size 1 inches Driver Type-Dom