Reader Andy Ingram is befuddled by an iOS limitation. He writes:
I have multiple AirPlay-compatible speakers around my home but it seems that I can stream music from my iPhone to just one of them. Yet on my Mac I can stream to multiple AirPlay speakers. Isn’t there some way to do this on iOS?
Not without some help from a third-party as Apple specifically limits AirPlay output to just the single destination.
If you’d like to stream music that’s on your iOS device, take a look at Thomas Schwitzer’s $3 Multiroom Music/Radio Player app. The "on your iOS device" is in italics for good reason. This app will not send music you’re streaming via your device—Pandora, iTunes Radio, or a music subscription service such as Spotify or Beats Music—to multiple AirPlay devices. It must be music you have on the device itself. For that $3 you have the ability to stream to two destinations. You can add up to six destinations with an in-app purchase of $2 per destination (so, $8 to add four additional speakers).