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 a low the speakers to blend into any decor.