Ill help you out here. If I am wrong, Tech pleas tell me.
Now, in the 4-200 (the earlier version of the 4.1) they said that you can just turn the volume down to the lowest setting and leave them for considerable time because they use so little power at that setting.
Now I may be wrong and I am just guessing here, but I think that the on/off button is just a sort of "mute" button or something. Sound is also outputted through my speakers when I have the on standby, but it doesn't bother me.