So I just did a site survey on the external paging system in one of the 2 buildings which has a 35 watt bogen amplifier. The other building has a 100 watt speaker AMPLIFIER
We have 19 speakers tapped at 4 watts and several others that add up to 9 watts for a total of 85 watts. There is also a 8 ohm speaker on the system as well. They are using the 25 volt [OUTPUT] on the amplifier.
My question is how is this working? I thought that you shouldn't go over the wattage of the Amp?
Well, even after cleaning up your post to correct it and remove irrelevant information, I still don't completely understand you. Are you saying that the 35 watt amp has a total of 85 watts plus the 8 ohm speaker on it? Or is the 100 watt amp included in this somehow?
Assume here that it's only the 35 watt amp working into an 85 watt load and a speaker without a transformer that you are talking about and wondering why it works, of course it is going to work. Just don't expect to get much volume out of it (which is probably why it's cranked all the way up) and much life out of it either. If this were a larger amp driven with music and a more sophisticated protection design it probably would shut down. But with intermittent paging it looks like Bogen did a good job protecting this little amp from stupid.
So what I recommend you do is recommend to the customer that they replace that 35 W amp with another 100 W- maybe more depending on the additional speakers you might add.
Since all those existing speakers are tapped a 4 watts and have volume controls, after replacing the amp and getting everything operating correctly, you might want to check where they have those volume controls set to. If they are not turned all the way up, consider tapping down the speakers to maybe 1 or 2 watts to save on the size of the amp then just get rid of the volume controls. Remember, the wattage taps on the speaker transformers are there to adjust the volume. So if you have some that are too loud or not loud enough adjust the taps. You shouldn't need a volume control. That just wastes power.
And either get rid of that 8 ohm speaker or replace it with one with a transformer (or add a transformer).