JL Audio H.O. Wedge Mobile Box Subwoofer Slot Ported Subwoofer Enclosure Loaded with Single 12&quot; W3V3 Subwoofers at 4-Ohm Final Impedance Slot Ported Subwoofer Enclosure Loaded with Single 12&quot; W3V3 Subwoofers at 4-Ohm Final Impedance Slot Ported Subwoofer Enclosure Loaded with Single 12&quot; W3V3 Subwoofers at 4-Ohm Final Impedance