That beeping is extremely annoying and easily fixed. There is a type of speaker system that has extremely directional sound. It involves combining two ultrasound sources that interfere to create an audible sound. The point is, ultrasound is extremely directional and using this type of speaker setup, only someone behind the equipment in a certain area would hear the reverse alarm at any noticeable volume. I saw this type of speaker setup in a magazine a few years ago, and they were saying that malls would start using it for advertising, and people might use it in home theaters so they can have them louder without disturbing anyone.