I have no idea what they are. I dont actually work for the fairgrounds I am just friends with the manager and he asked a favor so everything requires permission before doing things, which includes disassembly to measure and inspect.
There is no sound board or in the case of that horn wires hooked up anymore. The others have some wires but it does not appear to connect to anything (I kinda lose it as I follow it being literally zip tied to a power line - just to give you an idea of what I am working with).
No one currently at the fairgrounds even knows the last time they were used. They just are tired of renting gear for events, some events are too small to rent gear for which poses a problem.
The size of the area will determine what is needed and if these were used at a time when they were already old and at SPL they weren't designed for, it's likely that they failed at that time. If the fair grounds has several stages and areas with seating where the PA is typically used for music/speech, 70V isn't needed- that's used for widely-spaced speaker locations with long cable runs, not when the system and speakers are in closer proximity.
To be honest, the first step should be to determine:
Where speakers are needed for announcements
Where stages and amplified sound is needed
Whether the announcements will need to be played over the staged systems
Budget- stating a budget before the rest will only result in failure to meet the needs of the venue.