Kicker 47KMDB3 ABYC Compliant Ground Distribution BlockWell Grounded You need the best possible connection from your amplifiers to ground. Thats why KICKER didnt re-purpose a car-stereo solution to a marine environment. They created a simple, ABYC-compliant ground block made specifically for your boat. Use the RT-Series ring terminals for the best possible connection. Accepts three ground wires Compliant to Coast Guard and ABYC standards