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D2905/930000 The Classic tweeters are among the many highly praised designs in Classic series. They have enjoyed success over 3 decades. And still among the best tweeters available. The D2905/9000 tweeter kick-started a new era with a line of very high quality 1″ tweeters, today known as -9300, -9500, -9700 and -9800. Despite their many years on the market still used in many top High-End speakers around the world. KEY FEATURES: 1″ Textile Dome Diaphragm Low Resonance Rear Chamber Ferro Fluid Black Painted Alu Face Plate T-S Parameters Notes: IEC specs. refer to IEC 60268-5 third edition. All Scan-Speak products are RoHS compliant. Data are subject to change without notice. Datasheet updated: April 30, 2013. Resonance frequency [fs] 650 Hz Mechanical Q factor [Qms] 0.94 Electrical Q factor [Qes] 0.72 Total Q factor [Qts] 0.41 Force factor [Bl] 3.5 Tm Mechanical resistance [Rms] 1.96 kg/s Moving mass [Mms] 0.45 g Compliance [Cms] 0.13 mm/N Effective diaph. diameter [D] 33 mm Effective piston area [Sd] 8.5 cm² Equivalent volume [Vas] 0.01 l Sensitivity (2.83V/1m) 90 dB Ratio Bl/√Re 1.61 N/√W Ratio fs/Qts 1598 Hz Electrical Data Voice Coil & Magnet Data Nominal impedance [Zn] 6 Minimum impedance [Zmin] 5.4 Maximum impedance [Zo] 10.9 DC resistance [Re] 4.7 Voice coil inductance [Le] 0.07 mH Power Handling 100h RMS noise test (IEC 17.1)* 150 W Long-term max power (IEC 17.3)* 460 W *Filter: 2. order HP Butterworth, 2.5 kHz Voice coil diameter 28 mm Voice coil height 3.3 mm Voice coil layers 2 Height of gap 2.5 mm Linear excursion ± 0.4 mm Max mech. excursion ± 1.5 mm Unit weight 0.7