After my initial installation I have had to return 4 times to correct problems.This last time after waiting four hrs.I was told everything was done and in good working order.As soon as I got in my car and starting adjusting the radio I notice that the front and rear channels were crossed.I went back in the store and expressed my disbelief that this could happen.This problem was resolved and I left .On the way home I discovered the front right speaker was barely audible,the sub woofer does not seem to be working and there is a buzz from the rear speaker.This mean I will have to return for a another time.Before I do I plan on contacting the store manager and finding a time that will be most convenient for me. I would like to hear from someone with some authority upon receiving this.