Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Great GLI, just keep away from the body metal

I got this because the local car audio shop had the exact same thing in stock for 30$ and amazon had it for 20$ cheaper. I plugged it in and almost all my feedback disappeared. However, I did notice that when I moved this GLI around the car while plugged into the RCA cables, the "whining" would increase and decrease with proximity to the frame of the car and body metal. I just found a happy place for it where the "whine" was completely eliminated and viola! no more feedback