A 4 ch wiring kit. NVX KIT84 for 73.99, but I can get 25% of that price. NVX XKIT84 100% Copper 8 Gauge Car Amp Install Kit w/ 4-Ch RCA. The other one is a Kicker set ZCK44 Z series for 86.80.Amazon.com: Kicker 09ZCK44 Z-Series 4AWG Amplifier Kit with 4-Channel Interconnects ROHS Compliant: Car Electronics. The amp is ab ph4100. Thanks.