OK, I've just done some testing at last.
To play a pair wired together via the mini jacks you first have to put them in multi speaker mode. That means you have to press the B&O logo continuously for about 8 seconds until the LED is orange - note, it is flashing orange which B&O don't tell you. Do that on both speakers. If you try to play music now you get nothing. To get the music, you actually have to press the B&O logo briefly again until the orange LED is lit constantly - now the music appears in stereo. Then, after a few seconds, both LED's revert to solid white which again B&O don't tell you!
When they are like this, Bluetooth is not available.
So yes, they do work wired if only B&O would give customers the correct and full information.
I can't comment on what you wish to use as your source.
Dave.
As a further comment - yes, the auto sense works in this situation.
thank you, it seems there is hope to get the setup i had intended to work.