Everybody knows at Crutchfield you can Outfit My Car and it tells you exactly what speakers and head units fit and don't fit. Crutchfield unfortunately doesn't carry every car audio brand out there. They do carry Focal, Morel, and Helix though. But what about brands like Hertz, Rainbow, CDT Audio, Image Dynamics, Sundown...the list can go on. How are we to know if these brands can fit in our car? I guess the only "true" way of putting them in our cars is to get the Q-Logic's right?