Carwires PDB300 3-Way Power Distribution Block
The PDB-300 power distribution block allows you to connect as many as three amplifiers to a single power source. The main input lets you connect 4 or 1/0 gauge wire from your battery to the block, and you can run up to three 4 or 8-gauge wires to your amplifiers. You'll also need to place in-line fuses between the distribution block and your amps. It can also be used to combine the ground wires of multiple amplifiers to a single grounding point.