You will need RCAs long enough to go from the amps around to the drivers side. I also ran power, ground, and remote wire all the way around to where the amps are as well. Hooking up everything went very well, its an easy install. Don't know about the Harmon Kardon. I used RCA cables that were 20ft long. The RCA cable from the tower speakers, the white one was long enough to make it to where I installed mine on the drivers side. Aslo you will need 2 cables that turns the RCA output into 1 and use a coupler. You need to do this as there are 2 sets of RCAs for the boat and only one set to plug into. I installed the WS-420, but install should be similar.
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