The C645 will make you hear music with new ears. That's intentional. First, it gives you a 6-1/2" Kevlar woofer along with a 1" aluminum-dome pivoting tweeter and contour switches for treble and bass. So, it can easily handle up to 150 watts of power without losing detail. Listen up.
Design:
2-Way coaxial in-ceiling
Tweeter:
 Pivoting 1” aluminum dome
Woofer:
 6.5” Kevlar cone with rubber surround
Sensitivity:
 92dB
Frequency Response:
 32Hz-22kHz
Impedance:
 8Ω
Power Handling:
 5-150 Watts
Speaker Dimensions:
Diameter 9-1/4” X Depth 3-5/8”
Cut-Out Dimensions:
8-1/4”