This provision is "subjective immission" control. It may contain a numerical level or a "plainly audible" term and a curfew. it is applied to specific sources of sound as opposed to any location at which the sound is created. It is applied primarily to "amplified" sound sources. Older provisions listed several items such as televisions, phonographs, etc. Changing the title to the above addresses the real issue and allows for novel sound production devices. Numerous communities have provisions for these devices; many use "plainly audible" as the criterion, such as Omaha, NE (Section 17-3) and Buffalo NY (Section 293-4)