25mm textile dome tweeter with rectangular faceplate. The Monacor DT-100 is a simple drop-in replacement for many old rectangular faceplate tweeters such as the Peerless KO10DT / DT115 as found in many 1970s/80s designs. Featuring a soft textile dome and ferrofluid cooling, the DT-100 has an excellent radiation pattern and a very smooth, controlled frequency response. Key Features: Replaces Peerless KO10DT Smooth frequency response 25mm soft textile dome Wide Dispersion Good efficiency Great value for money Basic parameters: Resonant frequency (fs) 1500 Hz Nominal impedance (Zn) 8 Ω Effective diaphragm diameter 25mm DC resistance (Re) 5.7 Ω Ferrofluid ? Y/N Yes Max power handling 60 W Recommended crossover 2.5kHz/12dB Faceplate 115x80 mm Sensitivity (2.83V/1m) 92 dB Cutout hole diameter 72 mm Here's the full datasheet: