Speakers + children = blown speakers, often.
Though to be fair, this normally happens if the children are playing music too loudly - either the amp is too powerful for the speakers, or the amp is under-powered and outputs a clipped signal which also damages speakers.
I guess that an educational device like this should allow children to experiment with waveforms, and so children will occasionally generate a signal that the speakers don't like.
Biting the hand that feeds IT
