I have read of some who face the speakers toward each other (against each other so to speak) when breaking them in so as to cancel out the sound or even going as far as throwing a blanket over them when not listening to them so as to not annoy neighbors.
If you are concerned about your CD player, go buy a cheap one to play when you are not listening to them.
If you are concerned about your CD player, go buy a cheap one to play when you are not listening to them.