Well..... I installed the Soundstream Picasso Nano amp, Metra harness, etc, and I still have the most annoying constant high-frequency "eeeeeee" sound, as well as a slight fuzz. It's not crazy loud but noticeable when no music is playing, and the fact that it's still present is driving me crazy. I took out all the RCAs from the AMP, still happening, turned down all my gains, still happening. My only other thought is my power and ground amp wires aren't big enough (4.5mm/ 11gauge), my next step is to get an 8-gauge power and ground. My research is telling me its an amp issue, im just confused why the same setup has worked for others. Im stumped