The ERS 310 is a round 2-way in-ceiling speaker for use in a wide variety of applications, from stereo and whole-house music systems to complete home theaters. The ERS 310 incorporates Infinity's patented Ceramic Metal Matrix Diaphragm (CMMD™) technology to eliminate unwanted resonances and deliver clear, undistorted sound. The ERS 310 also incorporates a proprietary waveguide design to ensure smooth distribution of sound throughout the listening area. The white grilles and frames are paintable and allow the speakers to blend into any decor.