The ERS 210II is a 2-way in-wall speaker for use in a wide variety of applications, from stereo and whole-house music systems to complete home theaters. The ERS 210II incorporates Infinity's patented Ceramic Metal Matrix Diaphragm CMMD technology to eliminate unwanted resonances and deliver clear, undistorted sound. The ERS 210II 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 he speakers to blend into any decor.