Hello! I have the following problem: I installed a new radio in my car (Bluepoint Los Angelas MP 72). Since then I have a speed whistle on my boxes. With my old radio this was not the case. I installed new boxes in the front and additionally installed a chinch cable for the bass amplifier and looked for a new mass point. Does the whistle come from my new radio or from my change e.g. mass point? Can not imagine that an expensive radio generates whistles and me Who can help me? I’m glad about every answer.