Ok, I have a problem where I get a hissing noise on my 2006 Nissan Altima. I'm using a harness (Metra 70-7551) that has the RCA inputs so I'm going off the D3's line output levels, not the speaker wires, since I also have the BOSE amp system. I get a powerful, clear, and loud sound, however, whenever the music is turned low, or someone is speaking and there's no background music, the hiss noise can be noticeable and annoying. Any ideas? thanks in advance!