Those are Dynaudio drivers. I have a pair of Compact Monitors which I purchased in about 1987?, which also used Dynaudio. Looks like a DF21 tweeter, D76 midrange, and WM150 or something like that as the woofer. Mine use a DF28 tweeter with the same woofer driver. Very capable drivers, but a bit power hungry.
Not sure at all, but this pair might predate my CM's. ACI seemed to transition away from the expensive Dynaudio's from the late 1980's and on, often using Focal, Seas, or their own designs instead.