Rockford Fosgate R500X1D Amplifier + Wiring Kit Bundle R500X1D 500W RMS Prime Series Class D Monoblock Amplifier + BAK42 Complete CCA 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects R500X1D 500W RMS Prime Series Class D Monoblock Amplifier BAK42 Complete 4 Gauge Amplifier Wiring Kit with 2-Channel RCA Interconnects (CCA Wiring)