Hi Peter, i can feel them moving (each side) gently not as much as the other speaker, its as if the "oomph" is missing from this speaker.
I have set them to the 3 different settings, wall, free etc but no joy.
When i pan the sound from one speaker to the other i can clearly hear there is no bass being produced, its kind of tin like, with the tweeters working.
I can confirm the bass unit does move but no as much as the other or how it should, hope this helps mate. Cheers.