Woojer Edge shouldn't rattle. However, if the audio input is too strong - this can happen.
This is most likely to happen if your Woojer Edge is connected to the source device through a wired connection.
In this case, you should lower the volume of the source device (Phone, Computer, Console, etc..), and increase the Woojer Edge's sensation level.
If the problem persists, please contact our Support Team.