Speakers in Central Plaza

I know that speakers come out of the windows on Main Street for the parades and that they are scattered on Frontierland roofs and in birdhouses. Does anyone where the speakers are for Walt Disney World's Central Plaza?



If I recall, they're on posts around the Hub, up higher. It's been a couple of years since I was last there, so I may be wrong on that.
There are green ovals that hang from the lamp posts that look purley decorative, these in fact are the speakers, there are also speakers in the windows of mainstreet and in the flower boxes