I have Volfenhag subs...they are cheap and hit hard and I like them. Some people have said the quality is so so, but I havent had any problems. Well, one of the subs has a bad voice coil, but I did buy them used from a friend I worked with. Also have a 1 farad cap. But yeah, do your research......and that will take time because the reviews will look good, and then theres always one or two that says the product is horrible. lol