Try this from the fruity forum...
I found the solution.
Start bluetooth on the xperia
Start the JBL speaker, the button lights blue and you hear a short warning-sound.
Now push the startbutton on the JBL again and hold it.
The light turns red.
Look at the xperia and after a short period the name JBL pops up.
Stop pushing the "red" button at the JBL
Select the JBL name at the xperia to connect.
When it is connected or paired, your done.
The next time you want to connect the JBL you do not have to repeat the above, because your Xperia knows you have a JBL.