Yamaha NS-IW470 in-wall speakers deliver superb audio quality for both stereo and home theater applications. These speakers feature a 6.5-inch woofer, 2-inch midrange, and 1-inch tweeter for a frequency range of 55 Hz to 28 kHz. With a sensitivity of 87 dB and a nominal input of 40 watts, these speakers can fill any room with rich, detailed sound. They also include a mid-high level control for adjusting the tonal balance to suit your taste or listening environment.