Does anyone know what the differences are between the internally suspended chassis on different components? My 552 seems to be quite freely moving and clanky (my CDS3 was the same I think), but the ND555 is very different. There seems to be more resistance to movement and it emits a much more damped clunk. Are there elastomers in the ND system?
Note. I am not moving these things around without care, these are just observations when lifting to/ from the rack.
I can’t really an answer your question but I have noticed exactly the same thing. You can barely move the 552 at all without various noises whereas the ND555 is fat more forgiving of a shaking hand. I am guessing the suspension is optimised by design for the product by engineers with far more technical knowledge than me. 
I know when i have moved my NDS around, only from one shelf to another etc. it wobbles around like a massive jelly…which i have always found amusing!
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