Dont stack, part off the reason for the 2 box design is so you can get the transformer away from the amp boards, plus the cables will be very compromised.
Side by side if you can, with the power supply not on the left
One the left??? Brawn on the right I thought, a least that’s what I read in this forum several times, suspected reason being that the transformers are typically on the right side of the PSes, at least the smaller ones (not sure about the 300 PS). Now I am confused and I need to know
I recently got my 300 and read most of the discussions here about it, I think. Richard said specifically that the 250 and the 300 are quite similar internally apart from the different layout, so my only explanation for why the 300 is so much better than the 250 (at least for me and many others, see the 250 vs 300 thread) is the separation. Hence I would never put them in the same rack. But of course if space is an issue, you might have to. If you “stack”, I do hope you mean at least separate levels No idea about order in this case unfortunately, because I never would
My 4 boxes are
so pretty much yours but with a different ps for the 272. That’s my stacking order, on the basis that a power supply should be distant from the streamer and the 555 is ‘bigger’ than the 300PS so is furthest away. The cables hang a bit better that way too, and where they do meet I found slices of foam pipe lagging is good at separating them.
When I was limited to a single stack due to a lack of space I found the following to give the best sound quality:
I often wondered whether an additional Fraim gap between the 300 & XPS2 would have made a worthwhile difference mindful of the 6 box tall Fraim rule but certainly separating brain from braun as best I could within the limitations of a 6 tall single Fraim stack seemed to make the best of the components involved.