70V

I have a school paging system that has a 70V 5W output per port to a speaker. I have a gymnasium that needs to be louder than that. Off from one of those ports, I have installed a Bogen WMT1AS which is supposed to step down the 70V output to a line balanced input to an aux input of a Bogen C60...

I have been mapping a fire station 70V PA system that keep losing sound. I found some speakers that were missing transformers and I also found 2 speakers that were tap at 4W, but for 24V system. Is this ok? or do I need to re-tap the transformers? I'm also new to PA systems Thanks