I recently installed an Alpine ilx-w650 in my 2000 Toyota land cruiser. I chose to not bypass my factory amp. I have a minor but annoying hissing noise that comes from the stereo which is more noticeable at low volume. I have read all over the forms but can't find a solution. It is not picking up anything from the alternator because even when the engine is shut off and I am just running off battery I still get this noise. I believe the solution is either finding new ground, RCA filter, or a ferrite core electric filter. I am not sure what will fix this and I am wondering if any of you guys have had this problem and have any advice. Thanks!