I have a pioneer Deck, an alpine 500rms amp and a 10 inch jackhammer sub. The sub and amp are newer and I have had them tested separetly, knowing they both work. I can't get the sub to hit hard, it makes noise when the dials are all turned up, but its not right. I have tried switching my ground location, switching wires. I no longer know what to try. It is a cheaper system, but I know its nowhere near potential bass. Any suggestions are greatly appreciated