With the ECK4v2, SoundBox brings you a 4 Gauge Amp Kit.
General Features:
SoundBox Connected 4 AWG Kit.
Complete Amplifier Install Kit Includes RCA and Speaker Wire
Heat Tested Wire Jacket For Maximized Ease Around Curves
Heat Tested Wire Jacket 
Pro Grade AGU Fuse Holder 
Twisted RCA Cables for Maximized Sound Interference Control
What's Included:
18 Ft. - 4 Gauge Power Wire - Red
3 Ft. - 4 Gauge Ground Wire - Black
18 Ft. - 14 Gauge SuperFlex Speaker Wire
18 Ft. - 18 Gauge Remote Turn-On Wire
18 Ft. - Triple Shielded Twisted Pair RCA Cable
Black Protective Wire Loom
InLine ANL Fuse Holder 
80 Amp AGU Fuse
Connecting Terminals / Wire Ties