Its suggested rating of 100w, might be possible, with something like a 105dB efficient k-horn_type speaker, or hyper efficient single driver system.
With a lower efficiency rig, like the ADS, it is just barely reaching too loud; truly at the bottom of the too loud threshold; some people might desire more.
It would make a nice desktop office system with less efficient speakers, and near field listening.
Bottomline, disregard their statement of 100w. It is truly speaker dependent. I first tried a pair of Realistic Minims-7's bookshelves, which are rather inefficient. I was not impressed.