It's a Sony........
What about 2x PSU's rather than one with a splitter cable - is there any gains to be had?
Chord Mojo / Sennheiser HD600
Just for any folk who may not have seen it, here is the Darko video explaining Pi upgrade including dual power supply.
https://darko.audio/2018/11/a-short-...one-signature/
Main system : VPI Scout 1.1 / JMW 9T / 2M Black / Croft 25R+ / Croft 7 / Heco Celan GT 702
Second System : Goldring Lenco GL75 / AT95EX / Pioneer SX590 / Spendor SP2
I am not surprised by your positive findings. The good news is that the RPi can sound even better. I would listen to the SEG and Dorado again and try some of the different filter options. There are huge improvements to be had by using Audivarna for software upscaling. I use an Allo Digione which has built in isolation and is good enough that I feel no pressure to upgade.
I'm using a couple of the PSUs that can be found on eBay by searching for 'Studer 900 power supply'. I have a single 5V one in a case, and a dual supply on a board. Audiophonics also sell the latter version. A couple of guys posting on diyAudio had good results with them, but buying eBay stuff from China is not everybody's idea of a good idea. I'm happy with mine, but I did have to change a couple of resistors on the dual supply version because the current limiting was set too low.
Are you going to get a HAT for your Pi Oli?
https://www.allo.com/sparky/digione.html reviews look good and a no brainer to up the performance.
Main system : VPI Scout 1.1 / JMW 9T / 2M Black / Croft 25R+ / Croft 7 / Heco Celan GT 702
Second System : Goldring Lenco GL75 / AT95EX / Pioneer SX590 / Spendor SP2