Hi Josh, Welcome. I never really got into the car audio stuff, though over the years my car has had some,...odd stuff in it. Realistic mini bookshelf speakers (the little metal ones), Honeycombs, Pyle drivers, Kenwood, Pioneer, and MTX, Kraco, Majestic, Clarion and others to name a few.
Check out what some of the stuff looked like after many years of hard use,.... I've had this car for about 25 years or so. Those square things are the Honeycombs (at least thats all I've ever heard them called) funny how much damage can occur with heavy use and many years of the sun beating on them through the back window. Believe it or not, all that stuff was still working and even sounded pretty good when I pulled it out.