Hi there, and welcome to the forums.
Please try to post questions in english in the english forum.
To answer your question, the poweradjust doesn't really do anything the AE6 can't do on its own. In the earlier versions it provided output wattage the AE4/5 itself couldn't. Nowadays it is still useful if you need an additional high-power output, e.g. if you can't make do with four laing D5 any more and need a fifth. Or you could use it standalone if all you want is to control a single D5 and don't want to buy the whole Aqaero.
For your setup, I guess the AE6 should be able to handle the load alone.