I agree with many comments above in that we all can play a "what if" game and invent the perfect scenario to back up our personal beliefs. There are many variables in every shooting situation that no one tactic will work in all cases. You do have to have a variety of skills and tactics to be able to defend yourself and your family not only physically but legally and on some level morally.
I try to not "put all my eggs in one basket" by relying on just one aspect like sound, what if the homeowner is drunk or sleepy and slurs his words, there is a nearby noise like a train/airplane etc. or the suspicious person (who may be a friend or family member) is drunk/ sleepy or wearing headphones etc.
In states where there is no "stand your ground law" you may be questioned about the suspect and how did you know if he had the physical ability to cause serious harm or death to you or a family member? I know the old adage about "better to be tried by twelve then carried by six" but think about the legal defense if you could say I did what I could to identify the threat and not just shoot in the dark......especially if the "intruder" was a family member or friend.