Model :13W3V3-4 jl audio Free Air Resonance (Fs): 23.66 Hz Electrical �Q� (Qes): 0.465 Mechanical �Q� (Qms): 6.774 Total Speaker �Q� (Qts): 0.435 Equivalent Compliance (Vas): 4.793 cu. ft. / 135.74 liters One-Way, Linear Excursion (Xmax): 0.610 in. / 15.5 mm Reference Efficiency (no): 0.371% Efficiency (1W/1m): 87.90 dB SPL Effective Piston Area (Sd): 103.850 sq. in. / 0.0670 sq. m. DC Resistance (Re): 3.569 ohm Nominal Impedance (Znom): 4 ohm Thermal Power Handling (Pt): 400W Driver Displacement: 0.096 cu. ft. / 2.72 liters Net Weight: 17.75 lbs. / 8.05 kg