The Cambridge Audio C165 In-Ceiling Speaker is designed to accommodate custom installations. This single speaker incorporates a 6.5" woofer, and a 1" pivoting tweeter. The C165 has a frequency response of 50 Hz to 20 kHz, which allows it to produce powerful mid bass tones and optimal high-frequency sound. This in-ceiling speaker is also IP65 rated for use in high-humidity and dusty environments. Use of plastic in the woofer prevents moisture absorption, produces a wide frequency response and provides control over cone movement. The pivoting tweeter is designed to improve off-axis performance and control over the speaker crossover.