I have a 2970 that is a good all around radio but on mine, it has a very heavy noise level (S4 all the time). I tryed different types of inline noise filters, DSP'S, etc with no help. Its not engine noise from my truck, the radio just has a heavy noise level or is not well filtered. Is this a common problem with 2970s? Is there a modification I can do to filter the floor noise better? Thanks Guys in advance Joe C.