2) PLANET AUDIO AC10D 10" 3000W Dual 4Ohm Voice Coil Car Stereo Audio Subwoofers Planet Planet Audio AC10D 10" 1500 Watt Dual 4-OHM Car Subwoofer. RMS Power: 1500 Watts. Peak Power: 750 Watts. Mounting Depth: 4.75". FS: 39 Hz. Qes: 0.976. Qms: 4.47. Qts: 0.801. Vas: 0.988 CuFt. Xmax (One-Way):10 mm. Sensitivity (1W/1m): 87 dB. Recommended Sealed: 1 CuFt. Recommended Ported: 2 CuFt. Port Diameter: 3". Port Length: 5". Port Frequency: 37 Hz. .