Yes. The posted notice that you have cameras with audio in addition to the subject's entry into your home should be enough to constitute consent under a two party consent law (not sure if Cali is Two Party Consent, but it would not surprise me). The posted notice by the entrance door provides the information that you are using recording devices and their entry into your house (whether by legal invitation or illegal trespass) is an action taken that implies consent to the recording (they do not have to enter your house if they did not consent, you did not kidnap them, and they did not request that you turn off the recording devices prior to their entry nor did you agree to do such in the encounter.).
That said, it might be a murky area if the person in question is a lawful resident of the residence but never approved of the cameras OR the cameras were put in places that may have an exceptional reasonable expectation of privacy (i.e. inside a bathroom). Additionally "Nanny Cams" might open up another matter. You should also check in a local jurisdiction if a guest has a reasonable expectation to privacy in common spaces of your own home, as 2 Party Consent normally concerns recordings where one would have a reasonable expectation of privacy, which is not a place that is accessible to the public at the time of recording.