PA speakers (Broughton CH4)

I have a pair of PA speakers. I know little about them, but am posting them for a friend. They are tatty and the carrying handles are broken on one of them. However, he tested them before handing them over and said they sounded very good, with no buzzes or rattles. I do not know what power rating they are. I thought I might be able to remove the back panel and look, but I can't. I think the only way in is to remove the speaker itself.

Size: 60x47x40cm, weight 23kg each. Each has a mounting socket on the base. This is a ~35mm hole, but I imagine it is a standard size.