The 100W powered speaker developed without flinching for a minimum weight. Level sound quality, there is not much to blame: a good balance with equalization easy to do.
Of course, these small 100W spit a little because it is often necessary to push up

I use this enclosure has been saying for four years for the song and sound to the keyboard, and I never had the slightest problem. It is more than enough in this context.
However, for a concert, although entedu, it will not be enough, unless you buy an entire family ... and I think it would be cheaper to Ancheta passive speakers and a good power amp.

In any case it remains a very good return at our concerts.
A great price / quality ratio, as most yamaha products.

PS: Above all, avoid products stagg! ! (In PA)