DS18 PRO 3″ Phenolic Replacement Diaphragm for PRO-DRN3PH and Universal 8-Ohm DS18 proudly presents the PRO-DRN3PHVC Replacement Diaphragm, accurately designed to breathe new life into your PRO-DRN3PH and other 3” Phenolic voice coil tweeters. The PRO-DRN3PHVC Replacement Diaphragm guarantees a perfect fit, eliminating any guesswork or compatibility issues. Designed to preserve the integrity of your audio system, it effortlessly brings back the clarity, power, and precision that you’ve come to love from your DS18 speakers.