Thanks for the reply.
It sounds like a very good player - a very nice purchase. It's just that in my view, I don't really see how minor vibrations would noticeably affect the sound quality. I guess it's possible that there may be some variation with vibrations affecting the player's read circuitry, causing amplitude modulated noise to be added to the analogue output. The only measurements I've come across for this sort of noise were thought to be below audibility thresholds.