The Yamaha NS-IC400 is an easy-to-install in-ceiling speaker system that has magnetic grilles and high sound quality designed to meet various custom installation requirements. It features a Yamaha original double-layer cone that delivers very natural sound tonality. A unique ridge-shape aluminum center cap with a stepped speaker surround eliminates mid-high frequency peaks, so the sound is delivered smoothly and musically. Yamaha's policy of always putting sound quality first, combined with decades of experience in producing fine speakers, ensures that the sound of these speakers is superior to that of many other in-ceiling speakers.