Hi @tandemb ,
Here’s a link to a [https://www.youtube.com/watch?v=41RonURJx08|video] that shows how to dis-assemble your speaker.
Here’s an image taken from the [https://www.manualslib.com/manual/1291161/Doss-Soundbox-Xl.html#manual|User Manual] which show the options you have to contact DOSS who may provide you with the information regarding European service centres (if they have any that is)
[image|1554963]
(click on image to enlarge for better viewing)
Hopefully this is of some help.