The Blue Line Home Theater Series 6.5' In-Ceiling speakers are designed make the most out of Home Theater applications or can serve as an upgrade to the Blue Line. Great care has been taken in driver material selection and matching to yield a synergistic sound. They feature Poly woofers, UFLC Soft Dome tweeters and foam gaskets to minimize vibration and provide an air tight seal. Installation is also made easy by the use of self centering screw heads and compatibility with the OnQ Pre-Construction Speaker Brackets. RMS power is 75W and peak power handling is 150W. Frequency response is 60Hz to 20 KHz..