Thanks for the information, these will be part of a portable system so the acoustics are secondary to size and power consumption and from some of the reviews on the sale page the frequency response seems to be beyond most mp3's anyway.
I know there is very little chance this will work but i was just thinking what would 2 of these do unamplified from an mp3 player ? ive got a couple portable speakers that have cheap paper cone speakers and i was just wondering if i could directly replace them, they would only need to be loud enough to hear within 10 feet or less. If they arent good for what i want i could always amplify them but would this even work at all ?