in my '96 318i, my back right HK speaker / sub, dunno what category it would go in, is blown, I'd like to replace it but I want a slight bit more bass, nothing extraordinary though. With that in mind, can you guys recommend me a sub that I can just swap in with that blown speaker in the back? how would the wiring be and would it fit? Adapters or anything? I'm a plain noob and need some assistance.