Re: Speaker recommendation
You won't find anything much louder than the Mackies that will still sit on a regular-duty stand safely, at least not without spending lots of money (thousands). Of course, with louder speakers for the far people, you end up blasting the near people into next week, unless the speakers are up really high.
Some judicious EQ and maybe a better quality mic might make a difference. Another sound quality killer is the person making the announcements who wants to hold the mic a foot away from their mouth, and speak in a quiet voice. :?~:-?~:???:
One thing that often works for me is a cluster of 4 speakers in a tight circle with their backs to each other, right in the centre of the field. This decreases the distance to the farthest people by half. The other is a distributed system...more speakers closer to the intended audience.
Get those Mackies up nice and high. Height is your friend.
Good luck!