The silk dome tweeter is prized by audiophiles for delivering realistic, non-fatiguing, high-frequency performance. The C2 component tweeters are built with 0.75-inch silk dome diaphragms that deliver powerful, extended response, on and off axis. Flush-mounting and surface-mounting fixtures are included to fit a wide variety of installation needs. Inline 12 dB / octave high-pass filters with tweeter protectors are included with this kit. The C2-075ct is designed to operate above 4 kHz with a minimum high-pass slope of 12 dB / octave.