Resolved: Please download the latest firmware version 3.4.2526 here.
There is a low static sound that occurs when changing the volume of the Cobblestone. Some users are also experiencing slight static during music playback. We're currently working on a fix for this. Thank you for your patience!
NOTE: Please also ensure that your Cobblestone and Speaker are not connected to the same power source (sharing the same ground). For example, there is static if they are using the same USB hub. Please power your Cobblestone using an AC Power Adapter like the one provided with our product.