depend on what your price range is, if your limit is $100 then there are good subs in that range, which could be complete trash if your limit is $200. If you want to know whats good then I suggest research, Subs can sound 10x better on some setups than others it all depends on your amp and head unit. You could have an MTX Jackhammer and without proper power or crappy setups it could be trash. If you want a beast get The HIFONICS MAXXIMUS subwoofer.