I have a Kicker DX 250watt amp with two RCA inputs and two RCA outs, I have two RCA cables connected from the Pionner CD player to the RCA inputs on the amp, but I need to take that signal to the subwoofer, except the subwoofer terminals are not designed for RCA cables. They push down to allow a wire to go in and then close to seal the connection. So how I am I suppose to wire the subwoofer? Thanks for any info.