They do, and yes, car audio is usable in home builds. I’ve seen numerous people do it and have heard several setups where they used all car audio, deck and amps and just a voltage onverter and it sounded great. it’s really not about if its made for home or car, its more about finding the speakers with cetrain specs that you want and making enclosures to spec for them so they work as intended. it’s easier to do at home because the surfaces and rooms tend to be much more regular as compared to car interiors.