I've a set of desktop speakers that are relatively similar to those on my laptop downstairs. They don't turn off and function fine.
I think it's good that the EU has directives for energy usage; ofcourse this extent seems a little bit bogus considering that you're the first person i've seen to have complained about it, but if people wanting brexit are going to go argue over this sort of stuff and put up "Oh we won't be able to use our Gigaworks speakers if we stay in the EU" as an argument, have fun with that.