HTC One M9 User Manual page 202

202 Entertainment
5. To switch between speakers or to group them, swipe up the screen again with
three fingers.
Just tap another speaker to stream music to it.
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To group speakers so that music plays through them at the same time,
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tap the Group button next to a speaker name, select the other speakers
you want to group it with, and then tap OK.
HTC BoomSound Connect app
If you're using Qualcomm AllPlay powered speakers, download and install the
HTC BoomSound Connect app to HTC One M9 to manage them, queue your songs to a
shared speaker, and more.
1. Connect HTC One M9 to a speaker or grouped speakers. For details, see
Streaming music to speakers powered by the Qualcomm AllPlay smart media
platform on page 201.
2. When you're prompted to download HTC BoomSound Connect, download and
install the app.