In general, many of these Bluetooth speakers on this list feature modern Bluetooth protocols (many version 5 and above), and that means they are often capable of connecting to multiple source devices. Your mileage may vary, and some proprietary apps will do a better job of controlling this functionality, though. Similarly, brands like JBL, Sonos, and Ultimate Ears  tend to offer features that let you group your speakers and play back music on all of them—giving you even more versatility and volume.