First I want to thank Hitchhiker for all the advices he gave me. I have just updated the driver for my sound card and VLC 3.0.8 now works very well with the speakers. I wanted to be sure I could reinstall the old version before doing so.
I apologize for my rough English, to have bothered you and to have thought that this problem came from VLC. Another big thank you.
I consider this problem to be resolved.
Maintenant pour répondre à Monsieur Ed Edison, dois-je me considérer comme un porc. Je ne pense pas avoir été impoli dans toutes mes réponses ni avoir insulté quiconque.
Je vous remercie quand même pour votre proposition de solution.