hey guys its my first post on this site!

what the other guys said is true most care subs are designed to be very "boomy" in a fairly small frequency area, but i have honestly used an Infinity sub in a bandpass box for a decent size sound system setup and it sounded alright with my bass.
what im getting at is if you find the right sub and build the box to your frequency specs that you want it would prob sound alright...but thats too much work, just get a speaker designed for your instrument