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Nope, it was the remote turn on wire. But, I need another RCA cable because the US Amp has a slightly different set-up then my Kicker so in order to use all four channels I need two RCA cables unlike with the Kicker where one RCA cable worked all four channels.
Alex
The reason for this is the newer amp is 4 channel vs 2 channels and you really want your rear and fronts separated on different channels to fine tune the system better. Glad you figered it out as that remote wire gets some people some times.