When I did mine, I used a 3 piece computer system (2.1 channel). That way, it plugs right into the PC.
I removed the stock cabinet speakers and set the two computer speakers on top of the grills and held them down with a strap. Then I strapped down the subwoofer in the bottom of the cabinet. The setup also had a wired remote for volume and bass. I attached it to the inside of the coin door for easy access. The brand was Logitech and sounds great.