The Hertz MP 25.3 high-frequency drivers from the Mille PRO series are designed to bring precise, clear treble to your car audio system. These tweeters feature a soft dome made of Tetolon fiber and a 25 mm mobile voice coil cooled with ferrofluid, which helps maintain stability during demanding playback. A neodymium magnet ensures a compact yet powerful drive, while the specialized Center Tuning Duct geometry works to lower resonance and reduce distortion for a cleaner sound. With a frequency response ranging from 1,400 to 22,500 Hz and a sensitivity of 91 dB, these drivers deliver an accurate sonic image. The faceplate is FEM optimized to improve off-axis linearity, meaning you hear a consistent sound even if you aren't sitting directly in front of the speaker. To further refine the output, the rear chamber includes damping material that lowers the resonance frequency and ensures a smooth roll-off. Measuring 44 mm in outer diameter with a shallow mounting depth of 27 mm, they fit easily into tight installations. When connected via a high-pass filter at 2.5 kHz, they can handle peak power up to 120 W. Each unit comes with its own grille and necessary installation accessories, making them a practical choice for enthusiasts who want professional-grade components that are easy to integrate into a custom vehicle setup.