I went out to my trunk, on the left rear panel I removed the 2 black tacks with needle nose pliers allowing me to pull the trunk carpet out of the way, I then loosened the 4 Phillip head screws that were under the carpet so I could remove the amp . I then adjusted the amp gain and reinstalled it. Took at least 5 minutes. Kind of have to use some force removing carpet tacks and replacing them. Thank's for the info...