Just put my new alpine in 2010 gmc sierra and it sounds like crap. It's my first install. All the colored wires have good soldered connections from the radio harness to the schoosche harness. I had two wires left over blue ones cause I don't have those accessories. The factory radio sounded a lot better, The volume on the Al pine isn't very loud and it distorted the louder you get. I have factory speakers. I don't know what to do. I paid a 180 bucks for this radio and it sounds awfull. Maybe I did something wrong?
