JL Audio 12W1v2-4 12-inch Car Subwoofer Driver (One piece only)
W1v2: PERFORMANCE OVERVIEW *** Shallow Mounting Depth * Superb sound quality * Works in compact enclosures * Long linear excursion capability yields reduced distortion and outstanding output *** SPECIFICATIONS *** Free Air Resonance (Fs): 23.68 Hz * Electrical "Q" (Qes): 0.443 * Mechanical "Q" (Qms): 6.465 * Total Speaker "Q" (Qts): 0.414 * Equivalent Compliance (Vas): 3.739 cu. ft. / 105.81 liters * One-Way, Linear Excursion (Xmax)*: 0.375 in. / 9.5 mm * Reference Efficiency (no): 0.304% * Efficiency (1W/1m)**: 86.81 dB SPL * Effective Piston Area (Sd): 81.392 sq. in. / 0.0525 sq. m. * DC Resistance (Re): 4.101 ohm * Nominal Impedance (Znom): 4 ohm * Thermal Power Handling (Pt): 150W * Driver Displacement: 0.035 cu. ft. / 0.99 liters* Xmax specifications are derived via one-way voice coil overhang method with no correction factors applied. ** Efficiency (1W/1m) is not an accurate indicator of a subwoofer´s output capability and should not be used as a comparison to other subwoofers to determine which one is "louder".