Alright, we have had a myriad of responses, all with different, and confusing results. So let's go back to the original question and take a vote:
"Will a 30 wpc tube amp damage Dynaudio Contour 2.8 speakers when listening at very low volume levels?"
I vote for no, using a 30 wpc tube amp at very low listening levels will not damage these Dynaudio speakers.
Remember, the question is not what amp you think will work optimally with these speakers, but will a low power tube amp damage these speakers at low listening levels.