Hi Thorsten and welcome to Beoworld,
as you're posting in ther german section of the forum it would be much appreciated if you could write in german ;-) otherwise the general forum is the right place....
You can find the user manual in the download section of Beoworld, but to access it, you have to upgrade your membership - a fair offer in my opinion.
Sorry I can't be of much help concerning the power issue as I never saw one of those in flesh.
Marcus