You don't need to worry about it for at least three reasons: first, the RME adjusts its output when you add bass, so it will not exceed the maximum level; second, your speakers are capable of SPLs that will become very uncomfortable to you well before they will overload; and finally, should the speakers be overloaded, their built-in limiter will kick in and protect them from any possible damage. And if you feed them with digital signal, then it will be impossible to overload them in the first place.