I bought a 2012 Ford Escape with sync. I want to keep my head unit but want to hook a 4 channel and a amp for sub (2 channel bridged) They both have RCA and regular speaker wire inputs. I bought a OEM-1 converter will this work or can I use the wire inputs on amp from head unit. Can some let me know if I have the right converter, Amazon said it would work. Or the best and easiest way to hook amps up. Thank you