The ADD button on the Sony XB21 enables you join from two to ten compatible speakers such that both play the same program. The ADD button joins two XB21s for Stereo or Double modes. It’s the bottom button on the rear buttons panel, just below the WPC button, and to the left of the USB power input port.
The Stereo Pairing function lets you join two XB21s such that one plays the left channel of the stereo program, while the other plays the right channel. Now to create a stereo pair, you need two SRS XB21s. Pairing the 21 with speakers other than an identical model did not work in our tests, and the Sony documentation states that you must have two of the same model in Bluetooth range of each other for connecting the two as a stereo pair to work.
Now To form a stereo pair of two XB21 speakers, do as follows.
When in Stereo Pair mode, each speaker is assigned one of the two stereo channels (either L or R). The speaker you press the button on will announce which channel is playing.
Note that there are no L and R lamps on this particular speaker. So you’ll have to rely on the voice assistance announcements as you press the ADD button, to tell you which speaker is playing which channel.
Now with the ADD button, you can reverse these assignments such that Speaker One plays the right channel while Speaker Two plays the left. To do that, simply press and release the ADD button repeatedly on either speaker until it announces the channel it will play that you desire.
When you’re ready to break the stereo pairing, simply press and hold the ADD button on one of the speakers for three seconds. A tone then sounds and the ADD lamp goes out, indicating that the pairing is now over.
When two XB21 speaker operate in Double Mode, both speakers play a monaural version of the music. I.e. They both play the sum (L + R) of the left and right stereo channels.
To establish Double Mode, you set up the two speakers just like you did for stereo mode. Then, press and release the ADD button on one of the speakers until that speaker announces that it is now in double mode.
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