Good news! It also worked for me!
I did several resets before (3 pushes) which didn't work for me.
Now I pushed both speakers for around 10 seconds (the speaker will switch off first, after few seconds of continuing pushing the button another tone will be emitted). I guess this a 'real' full reset. I then plugged them into the same multiple plug and configured them again.
Now I have a centered stereo image. I am happy it was that easy!
I did several resets before (3 pushes) which didn't work for me.
Now I pushed both speakers for around 10 seconds (the speaker will switch off first, after few seconds of continuing pushing the button another tone will be emitted). I guess this a 'real' full reset. I then plugged them into the same multiple plug and configured them again.
Now I have a centered stereo image. I am happy it was that easy!