It depends on which kit you purchased, you may have gotten an AMP and speakers.

Amp Connections:  The power cable for the Amp could either be a black/red or black/white combination for the +12v.  The Phono to RCA cable isn’t included. 

Mount your Amp board to your cabinet. Connect the +12v stripped wires end into the Power Supply.

a. Red Wire or Black with White line to +12v ; b. Black Wire to GND

Connect the +12v plug into the Amp. Connect your Speakers to the push points. Connect the RCA cable to the RCA ports and the phono plug to the JAMMA board. Amplifiers and Speakers