I didn't find a topic that answers my specific questions about the choice of the amplifier given the speaker of the cutterhead and the "minimal" power needed to emboss and cut so I opened a new one (btw this is the first topic I ever opened)

To start building a cutterhead I've bought two speaker (with 25W nominal power) very similar to these:
https://cdn.sparkfun.com//assets/parts/6/0/3/2/10975-03.jpg
- According to your experience could they be enough powerful to emboss and to cut?
General speaking and according to your experiece how much powerful need to be the speaker of a cutterhead to emboss and how much to cut properly and without big problems? Cutting and embossing are intended on material such as PVC, vinyl, polycarbonate (as far as I know it is the most difficult to cut) and so on.
- I've bought the speakers now I have to pick an amplifier.
What's the best choice to do given my speakers? An amplifier with 25w nominal output per channel, 50w, 100w or even more?
Thanks a lot and bella lì!
Dabe