Rectifying bridge.

While I am not an expert in this field, I don't know of any advantage to such a modification, unless you plan on increasing the rail voltages for some reason. Perhaps someone else can help you that knows more about it than I do. Generally, a diode bridge will yield about a 15% higher DC voltage out, than the AC voltage in. A fully regulated circuit in typically preferred over a rectifier. That is about all the theory I know on the subject. I am assuming you are talking about its use in some kind of amplifier.