The Klipsch CS-16CSM features a 6.5” Polymer woofer and dual 1” Polymer tweeter. Utilizing Klipsch Patent-Pending SkyHook Tool-Free Installation System by Swarm technology, your install time is reduced by 75%. Frequency Range: 65Hz – 20kHz +/- 3dB, Dual .75″ (1.9cm) Polymer Dome Tweeters, 6.5” (16.51cm) Dual Voice Coil Polymer Woofer, 91 dB @ 2.83V / 1m, 40W RMS / 160W Peak, 8 Ohm Compatible, CUTOUT DIMENSIONS 8.3” (21.1), MOUNTING DEPTH 4.34” (11.03 cm)