Shows how to pair the Sony speaker SRS-XB21 Extra Bass wireless unit to common devices. E.g. These include the iPhone, iPod Touch, and the iPad line of Apple phones, media players, and tablets. How to Pair Sony Speaker SRS-XB21: Step by Step With your SRS-XB21 OFF, the power button is dark. So run through these … Continue reading How to Pair Sony Speaker SRS-XB21