RE Audio SR PRO 10D4 10" 640 Watts Peak/320 Watts RMS Dual 4 Ohm Car Subwoofer With a 4 Layer Copper Voice Coil Professionally-tested components + Bluetooth 4.1 CSR technology for true HD HIGH FIDELITY SOUND and DEEP BASS will make you fall in love with ONUKI at first sound or your money back!