OP, if you're trying to break into the industry, not the way to do it... You need to learn some more before you can just "order some subs from china", cuz there is a hell of alot more to it than that. I would start by building your own sub, from different parts... just play around with some, figure out which motors, spiders, coils, cones, baskets, leads, etc that you like, and in which configuration... that is a good starting point... from there, you may be able to start planning. But, just to have "your own sub" and not try to profit off of it, i think you'll realize that it's going to be worth the MASSIVE headache it will create.