SQ Tweeters have an aluminum dome tweeter that exhibits excellent clarity at high-end spectrum frequencies. It has a vented back for better coil cooling, better frequency response than the competition, and lower distortion. It also features an aluminum shorting ring design. Features: RMS POWER: 75W MAX POWER: 150W IMPEDANCE (OHMS): 4 SENSITIVITY DB: 89dB MOUNTING DEPTH (IN): SFC Mount CUTOUT SIZE (IN): SFC Mount FREQUENCY RESPONSE: 2k-15k Hz BASKET TYPE: PLASTIC