TN-52 - Focal 150W Max K2 Power Tweeters High speed neodymium magnet N38H by the use of "Ferrotec 2000" ferrous fluid particularly temparatur stable characteristics, no dynamic compression very far transmission range (1kHz - 22kHz, +/- 3dB) Kalotte with one only 5/1000mm thin Tioxyd coating Efficiency: 94dB (2,83V/1m) Impedance: 6 ohms Maximum maximum stress: 150 W