And now for some surprise (as usual, at the inside :-))
First of all no savings on copper shielding here! Some output device and the whole servo circuits are shielded by means of copper (or copper-plated) covers. But there's more!
Hear hear, even a fake toroidal transformer! How's that? Well, have a look at the pictures below. At a first glance, it seems the D500 is equipped with a massive toroid, shielded by means of a copper cover. Actually, that is just a cover that hides a small standard transformer (the second pic shows the little secret).
Now, the trick may work fine to make the inside of the player much more attractive (audiophiles think toroids are all the rage nowadays) and, perhaps, the metallic cover acts as a shield for magnetic stray fields...but I'm pretty sure many D500 owners won't be glad to know what was hiding under the cover ;-)
So, buyers beware!, not all that glitters is...toroidal :-))))