SpeakerCraft CRS8 Four In Ceiling Speaker - 8" Aluminum/Magnesium Cone Woofer Pivoting 1" Aluminum/Magnesium Dome Tweeter Front mounted switches allow for up to ±3dB of Bass and Treble adjustment Timbre-Matched to AIM8 Four, CRS Four, MT8 Four and MT Four Efficiency: 90dB 1W/1m Power Recommendation and more Home HiFi Systems