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ScanSpeak Classic 18W/8545 7″ Paper Cone Mid Woofer This Scan-speak 7″ features the heavily damped and carbon fibre impregnated paper cone that dampens resonances normally associated with stiff cones. The magnet system is the new SD-1 system which eliminates modulation and dynamic distortion, as well as clipping distortion created as it exceeds its maximum linear excursion. These designs all together make a drive unit with a very “open” sound with excellent detailing combined with low coloration and very precise imaging. Cast frame, rubber surround. TECHNICAL DATA: Sensitivity 2.83V/1M 88dB Free air resonance Fs 28 Hz DC resistance 5.5 ohm V.C. inductance 0.4 mH Power 100W Effective cone area 145 cm2 V.C. diameter 42 mm V.C. height 19 mm Air gap height 6 mm Lin. & max. excursion ±6.5 / ±10mm Force factor BL Product 8.0 Tm Moving mass incl. air 20 g Net weight 2.3 kg Vas 48 liters Qms 2.30 Qes 0.30 Qts 0.27 Outside diameter: 177mm Cut out: 158mm Depth: 70mm 25.4mm = 1″ = 2.54cm Also written as: 18W/8545-00,18W 8545 00, 18W854500,18W/8545,18W8545