^ I lied. Turning off the 5ghz channel that the phones were connected to sorted this. Not that it makes sense but there you go.
It sort of does - most wifi speakers connect to 2.4Ghz. Are your 2.4 and 5Ghz channels named the same? Might just be a case of your phone defaulting to the 5Ghz channel which, if named differently, would stop you seeing the speakers.
You don’t really want to disable 5GHz, doing this will kill performance of 5GHz-capable devices.
@Howard started
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^ I lied. Turning off the 5ghz channel that the phones were connected to sorted this. Not that it makes sense but there you go.