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The Scan-speak 18W/8531G-00 is a 7″ Revelator mid/woofer. It features a non-resonant cone and dust cap structure, dynamic linear suspension, SD-1 magnet system, “Grasshopper” cast chassis with maximized air flow and resonance terminating mounting system. Less resonance in all structures, lower compression and higher linearity, faster termination of excess energy and higher sound pressure capability. The 18W/8531G should have an F3 of about 50Hz sealed and 35Hz vented. TECHNICAL DATA: Sensitivity 2.83V/1M 87dB Free air resonance Fs 27.5 Hz DC resistance 5.8 ohm V.C. inductance 0.35 mH Power 70W Effective cone area 150 cm2 V.C. diameter 38 mm VC height – Air gap – Lin. & max. excursion ±6.5 / ±11 mm Air gap flux density – Force factor BL Product 6.7 Tm Moving mass incl. air 15.5 g Net weight 1.75 kg Vas 61 ltrs Qms 5.0 Qes 0.39 Qts 0.36 Outside diameter: 182mm Cut out: 156mm Depth: 77mm 25.4mm = 1″ = 2.54cm