Free Air Resonance (Fs): 24.0 Hz Electrical “Q” (Qes): 0.443 Mechanical “Q” (Qms): 8.483 Total Speaker “Q” (Qts): 0.421 Equivalent Compliance (Vas): 3.65 cu. ft. / 103.4 liters One-Way, Linear Excursion (Xmax)*: 0.463 in. / 11.8 mm Reference Efficiency (no): 0.310% Efficiency (1W/1m)**: 86.9 dB SPL Effective Piston Area (Sd): 81.5 sq. in. / 0.0526 sq. m. DC Resistance (Re): 7.35 ohm*** Nominal Impedance (Znom): Dual 4 ohm Thermal Power Handling (Pt): 300W Driver Displacement: 0.07 cu. ft. / 1.98 liters Net Weight: 11.2 lbs. / 5.0 kg