Hi Pio! Those main momnitors look a bit like Westlakes, although I am unfamiliar with any of their models that have a front baffle quite like that. Possibly older models? The horns are similar to a JBL 2397 which Westlake did in a number of configurations and is a distinguishing characteristic of many Westlake designs. I'm trying to figure out which studio complex you were in. I used to routinely tour major studios when I worked for Otari, especially when the MTR90 was in development. I was the liaison for the Japanese
engineers during that period but only because my English was better than theirs.
That was a long time ago and several technologies ago.