Car: it's a thing that has an engine, automobile, et cetera.
NAH J/K I know you know what a car is... you must of thought it was some part of the sub? like what C.A.R. does that sub run?? Sounds confusing but yeah. A car.
actually they do, i have found sealed boxes work better for home theater when using a car sub, but they do work really well depending on the box and sub