Amazon.com: BOSS Audio Systems KIT10 4 Gauge Amplifier Installation Wiring Kit - A Car Helps You Make Connections and Brings Power to Your Radio, Subwoofers Speakers : Electronics
Amazon.com: Complete 3000W Gravity 4 Gauge Amplifier Installation Wiring Kit Amp Pk2 4 Ga Blue - for Installer and DIY Hobbyist - Perfect for Car/Truck/Motorcycle/Rv/ATV : Electronics
Rockford Fosgate RFK4D 4-gauge dual amplifier complete wiring kit — includes power wiring, two 2-channel patch cables, and speaker wire at Crutchfield