I can confirm that under windows 10 I was able to play audio through my bose soundlink 2 while using the WDA to watch via an HDTV. Initially I connected to the WDA, and then tried to connect to the speaker and it disconnected the WDA (think this was more a crash than an intentional disconnect) so then I connected to the speaker, and then to the WDA, and all worked fine.
Tested, the item. But very disappointed on its capabilities.
Here's what I tried :
1. Tried connecting to Bluetooth speaker and WDA using SP3. (Works)
2.Connecting to SP3 first, then switching to custom rom android phone. (Works 2x different phones)
3. Connecting to SP3 first , then switching to another win 8.1 tablets. (Failed)
4. Connecting to SP3 first, then switching to stock rom android phone. (Failed 3x different phones)
5.Connecting other devices first then SP3. (Fails)
So, with the limitations of what it can do. IMHO it was a bad purchase as I wanted to use it for presentations with others also,who wishes to use it with their own laptops. Does yours work well with other win 8.1 tablets? Maybe mine might be a defective unit.