Are you sure the speaker is ready to accept pairing? Is your bluetooth on (on the M11)? Can you see the device, but just not pair with it? If you can see it, tap on it in the settings->bluetooth-><speaker-name> dialog. Try turning the M11 bluetooth on and off again if necessary. If you're savvy about all the above and have it set up, then my best guess is that some _other_ device is actively paired with the bluetooth speaker (your phone maybe?) and needs to disconnect before the speaker will accept a new connection. I've never had trouble pairing with bluetooth receivers. The most frequent problem I have is when some other device is paired with the target.