Free Air Resonance (Fs): 24.3 Hz24.0 Hz24.4 HzElectrical “Q” (Qes): 0.4750.4430.489Mechanical “Q” (Qms): 8.4838.4838.483Total Speaker “Q” (Qts): 0.4490.4210.463Equivalent Compliance (Vas): 3.65 cu. ft. / 103.4 liters3.65 cu. ft. / 103.4 liters3.65 cu. ft. / 103.4 litersOne-Way, Linear Excursion (Xmax)*: 0.513 in. / 13.0 mm0.463 in. / 11.8 mm0.473 in. / 12.0 mmReference Efficiency (no): 0.300%0.310%0.295%Efficiency (1W/1m)**: 86.7 dB SPL86.9 dB SPL86.7 dB SPLEffective Piston Area (Sd): 81.5 sq. in. / 0.0526 sq. m.81.5 sq. in. / 0.0526 sq. m.81.5 sq. in. / 0.0526 sq. m.DC Resistance (Re): 3.82 ohm***7.35 ohm***10.32 ohm***Nominal Impedance (Znom): Dual 2 ohmDual 4 ohmDual 6 ohmThermal Power Handling (Pt): 300W300W300WDriver Displacement: 0.07 cu. ft. / 1.98 liters0.07 cu. ft. / 1.98 liters0.07 cu. ft. / 1.98 litersNet Weight: 11.2 lbs. / 5.0 kg11.2 lbs. / 5.0 kg11.2 lbs. / 5.0 kg