MartinLogan ML65i (Pr.) In-wall Speaker Affordable High Performance Solutions Installer Series is our affordable highperformance lineup, featuring custom installation solutions for inwall, inceiling and outdoor applications. Titanium dome tweeters and mineralfilled polypropylene drivers ensure great performance, while bezelfree paintable grilles that are secured with highstrength magnets provide and aesthetic that blends invisibly into any room Each model comes with an extremely robust mountinglock system that couples with the speaker's vibrationresistance ABS chassis when installed. Impedance - 4 Ohms. Compatible with 4, 6 or 8 ohm rated amplifiers Sensitivity - 89dB