Hi, first of all, excuse my very poor english I have a big problem with a bar in front of my window, in the middle of a little park. They close very late (ignoring the closing hour stablished by the law) and they make a horrible noise. Here (in Spain), there is very passivity applying the anti-noise laws, and I decided to counter-attack with the same weapons... I want to build a device to emit a sound cone in a controlled area with intensity and frequency so that it can be enough disturbing (and harmless!) to "convince" people stop making noise so late and go home. The persons are in a 30 meters radius. The question is very simple: I don't ask you to tell me a step-by-step guide about constructing the device (anyway...this would be nice!) but only if this is feasible, and the possible difficulties building this device. Thanks in advance!! PD: I am mathematician, so I think I can understand some science language.