The NS-IW480C is an easy-to-install, versatile in-ceiling speaker system delivering high-quality Natural Sound to enhance the home theater experience. It features an unique crossover network to ensure maximum sound dispersion in conjunction with dual tweeters; SoundMax. It is designed to have a slightly different highpass crossover network point for dual tweeters to be able to maximize their sound coverage while minimizing mutual interference of high frequency bandwidth and preventing the degradation of stereo image as known as combing effect.