This particular speaker appeared in my neighbor's yard around three months ago, in June. Particularly note the direction it is pointed - for reasons that are deduced in this post. It was moved to a more permanent location on the side of the outbuilding, as seen in this September picture. Note that it is installed at the height of the top of the window.
Perhaps a half-acre lot is big enough to warrant an outdoor sound system, especially since the occupants spend massive amounts of time in their business yard messing around with the catering truck, the food inventories in various locations, the trash and waste dumps and, of course, the ice machine.
The questions begging for answers are: Why was THIS speaker patched into the outdoor radio system? and, Who is the intended audience for the "Mega 100.1" elevator music claptrap that plays every afternoon, into the evening, and all weekend?
Take a look at the physical layout sketch in this post and the recent pictures below. Immediately in front of the speaker is the graveled northwest corner of the lot, which is shaded by an enormous fruitless mulberry tree and is used only for storage.
The barbeque is pulled around the corner of the porch before each use. During the summer days, while they are gone, this shaded area also hosts a wading pool filled with water for their pack of dogs to drink from. (These practioners of sanitation used to just leave buckets of ice and water in front of the ice machine for their dogs, but then they put up the plywood box, which acts as a barrier for dogs but not for noise.)
Farther back behind the tree is more storage - bricks, boards, ladders, etc.
The residents simply do not spend much time in this corner of their yard. Out in the middle of the yard is a tented gazebo, where they do hang out and yard radio speakers would be expected.