Ok i have had about a year long problem now. In my friends toyota matrix we have had a problem with roadnoise, or at least thats what we thought it was. My friend went ahead and tore apart his whole car and dynamated the whole thing and then we ran the rca's in the roof and the power lines on the floor, but there was still road noise! so we took out his amp to his subs and his subs because that seemed to be defective and we thought ok it must have been the defective amp.. wrong again! so what we have noticed is that its not really road noise but rather just static for when he steps on the gas the sound does not fluctuate it just stays the same. Now i will say just in case there is no explanation for this that at one point he had a short in his car... but then it magically disappeared.. so i dont know if it has to do with that... but there is the whole story so if there is any input or ideas please let me know thanks!