I have just bought a b&w zeppellin air which got a 5 star review, i do think the sound quality is great however what is the differences between a £500 Ipod Dock and a CD Player costing £3,000 upwards also with a 5 star review. I can't see how on audio terms only that a CD Player worth thousands of pounds can sound that much better than my Ipod Zeppellin Air. Can someone list the main diffrences betwwen a zeppellin air for example and a 4 figure sum 5 star CD Player?