I'm an older guy, just turned 40 and have gone through many installs in my earlier years. I've had some good installs by shops and I've had total crap installs. Well I wouldn't say the installs were crap but the bass setup was. I would say the worst problem I have ran into with installs is the box builds were wrong for the speakers of choice. I have always bought quality subs for my installs but often the boxes were build wrong. I've even pissed of installs by telling them to rebuild the box because the bass sucked. That even happened in a Camaro once, where bass should be easy to do. I've also learned that less can mean more too. Subs need plenty of box space. Sometimes having 2 subs instead of just one sub means crappier bass because they are lacking sufficient air space. I do like to brag on myself. I don't let the shops install anything for me anymore. I do it all, even the box build and I did quite good with the last box I built for my truck. 1 single Jl 12 with 2 cubic feet air space and it sounds great. The only problem I got is I've got too much amp for that sub. So I may sway it out for a Kicker CVX. Anyone else have had problems with crappy shop installs?