I have been following threads in both the Rapid and Ocatvia 3 forums as both my wife and I have noticed a boom/pressure on the ears particularly when travelling at 20 to 30 mph over rough/damaged tarmac surfaces.  This has been particularly unpleasant whilst I had a head cold and the tubes in the ears which normally equalize the air pressure were blocked.  Initial thoughts were that it would have to be a large panel to resonate at such a low frequency and hence the chassis or tailgate but, when