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ScanSpeak Classic D2010/8513 20 mm Dome Tweeter Similar to the D2008, but with several improvements, a foam impregnated front face plate and a lower resonance. Double chambered 3/4″ damped textile dome tweeter with the same diaphragm and voice coil as the D2008. The lower resonance of this driver will allow it to be crossed over lower than most other 3/4″ dome tweeters, yet retain the low distortion and clarity of a 3/4″ dome. We recommend a steeper x-over slope be used when the x-over point is below 3KHz. TECHNICAL DATA: Sensitivity 2.83V/1M 90dB Free air resonance Fs 800 Hz DC resistance 5.7 ohm V.C. inductance 0.07 mH Power 12dB@Hz 150W@4K Effective cone area 3.8 cm2 V.C. diameter 19 mm V.C. height – Air gap height – Lin. & max. excursion ±0.7 / ±1.2 mm Air gap flux density – Force factor BL Product 2.4 Tm Moving mass incl. air 0.25 g Net weight 0.4 kg Outside diameter: 98mm Cut out: 69mm Depth: 41mm 25.4mm = 1″ = 2.54cm