Sounds like a mismatch in gain between the head unit and amp. I cannot troubleshoot well unless I have the vehicle. Hook a portable or bookshelf speaker to one of the speaker outputs of the D3 If no static, the D3 is not the problem. If not using the OEM Bose interface converter then try it. Newer factory systems especially Bose are known for nonstandard wiring and definitly not plug and play. Sometimes these will correct ground loops and other problems encountered when using an aftermarket head unit. They make those due to the demand to solve a problem. If you are barely turning up the