Your amplifiers need hefty power and ground wiring wiring in order to deliver the big power you want. Kicker's PKD4 multi-amp wiring kit includes the basic power, ground, and turn-on wiring for any amp system with a total fuse rating of up to 100 amperes. This kit is suitable for a system with a total output of about 650 watts RMS for Class AB amps or about 1000 watts RMS for Class D amps.
The kit includes a 17-foot 1/0-gauge power wire that runs from your battery to the included distribution block, along with two 4-foot lengths of 4-gauge wire that'll readily accommodate two amplifiers. Kicker makes all their wires from oxygen-free copper so you can count on maximum power and signal transfer with minimum resistance or interference.
The PKD4 kit also includes Kicker's DB4 power distribution block, which takes the 4-gauge input and sends it to four outputs (4- to 8-gauge) — you can power up to four amplifiers with the one main power cable that runs from your battery. The DB4 block features a second 1/0- to 8-gauge input so you can daisy-chain another distribution block or amplifier into your system, if you want to expand later.