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The turntable and speakers now pair successfully.
Followed the instructions in the help guide - reset text.
I Think Sony could do more to reference the help guide in the documentation that comes with the speaker. There is a url link in the "getting started" material, but it is too "a page that doesnt exist".
I also have the suspicion that the reason they did not pair out of the box is that the speakers were used in the store to demonstrate the device, and came to me already paired with something else in the shop. Without access to the help guide, I was limited in knowing what can be done (reset, initialese, force pairing etc).
So the link you gave to the help guide did the trick, thanks