ma audio isn't very good, the best one on the list is pioneer, infinity is pretty good sub, the best subs are make by adire, elemantal designs, and a bunch of other brands that not many (uneducated)people have heard of. one rule in car audio is " you get what you pay for" except for jl audio, i mean they are great subs, but overpriced. so the really cheap subs generally aren't very good and the higher priced ones are usually more high end, but there are exceptions.