The impact of a car speaker wire on the overall setup has been a subject of debate for as long as I can remember, but regardless, it wouldn’t hurt to purchase quality cables to compliment your system. Generally, the thicker a wire is, the less resistance it offers to the flow of current through it – make of that whatever you will. Other impacts a wire has on the quality of sound produced is open for testing, and I’d urge you to tinker the system a bit till you find a setup that works for you.