Let's go back to the beginning of the 70s when Daniel Dehay an electronic engineer starts 3A with the help of Alain Guillaud who ended up working for Framatech and Max Chalambeau who will eventually start Alpheratz...and has now completely changed his field of activity.
The drivers were manufactured in a dedicated factory in Lussac-lès-Chateau
"The Andante won our Compact Quality Award on the basis of its superb sound for its size. It also deserved the award for solid construction. It was organ music that demonstrated best the amazing deep bass of this small speaker...we were astonished to find that the pedal notes of organ, the earth shaking were as loud and clear on the Linear as on a speaker about six times its size". Extract from the 1980 catalog, with no source noted...This was the 1979 version.
3A closing their doors was big news at the time and coincided with the rise of JM LAB/FOCAL who became in time the largest client of GUY HF and eventually buying the business.
Another factor in the failing of the business was the plethora of models and the incessant redesign of successful speakers with new drivers and various revisions of the same models.
I have no intention to name and review all on them here but will direct you to the excellent overview put together by Jean-Marc Hauchard here: