With a sensitivity of 90 dB, the W667 needs only about half as much power as a typical speaker. That's especially important in budget multiroom installations, which sometimes use very low-powered amplifiers. Because the W667 uses the same cutting template as our other 6��-inch in-wall speakers, you can easily mix'n'match Proficient models without worrying about cutting the wrong-size hole. Includes Thin-Bezel Grilles held by Neo Magnets.