If it sounds good as it is now don't be surprised if when you get it all 'correct' it actually sound worse - it can happen!
I once found that having a non-powered NDS sitting on the shelf under my 555 Head unit sounded great, but removing the NDS (was home-demo) and placing anything else on the shelf or having it empty or removing it was not as good. I was not going to buy the NDS just to occupy the shelf to make my 555 sound better but it showed me that Fraim is designed for the Naim large box footprint boxes to sit on it for it all to sing right. In the end I found getting a very slightly heavier bit of custom glass shelf achieved what I wanted for the empty shelf.
The 500 Head unit does sound better not on the lowest shelf - faster and less heavy - so try to have it at least a shelf up and definitely get the Burndy cables off the floor, as that makes a large difference in bass quality and music-making.
You do not need the isolation between the 552 and 500 head units, but I'd definitely have the 500PS on the lowest shelf with a space or larger shelf between it and the next box. Presently you have the 500PS away from the 552PS which is most sensitive, but you should find getting the 555PS away from the 500PS to be also worthwhile.
It is sometimes trial and error and trust what you hear in the end. I learned all this from once having to un-do a fraim rearrangement that made me think I'd broken something in the system - it was that my Supercap for the Snaxo really hated being next to a 500PS.
You're right! Got the medium shelf, rearranged stuff - and the smile is gone. Music sounds confusing and muddled. Problem is - two things have changed - shelving and the cable between 552, and 500...
Tried a bunch of different combinations, but maguc hasn't returned.
Waiting for the cables now
I tried a bunch of stuff - I've got two medium shelves, plenty of fraim, and a bunch of extra fraimlites I can use. What do you recommend for stacking? I was thinking:
Nds on medium, 552 on medium, 500 on standard + extra isolation shelf, spacer on 1/2 base.
552, 555, space, 500 all on standard.
Which should be 'optimal once my cables returns.
I have a meter that I used this morning to look at the magnetic fields caused by the PSUs. These extend half way into the head units horizontally and more than 3 standard shelves vertically!
So spreading the units as much apart as possible is also key - they only escape so much magnetic fields by being on the brain shelf.