Well the two front stock speakers that were in the door were torn so I threw them out. I turned Dolby off and messed with the head unit settings but can't get it sounding perfect, it's not horrible as I use it and don't complain, but it's not that great.Turn up the bass and treble, turn Dolby off and put factory speakers back in the front doors (about a 10 min job); that will fix the sound system. Did the same thing with my 850R estate when I got it and it sounds awesome now.
Or skip the speaker replacement if you don't want to do it since you're selling....just fixing the settings on the HU should make a huge difference. Turning Dolby off is like taking your head out from under the blankets.