I've been on a bit of a relentless pursuit of Pi improvement. I started off with a early version of the Allo Boss DAC (not the 1.2v) and a Pi 2, this was enough to convince me that it would be wise to investigate this source more.
I decided to go mad. I bought the Boss 1.2v, Isolator 1.2, Pi 3+ and a Linear PSU.
The results were, In all honesty, staggering.
I'm not joking when I say, it made the Chord Dave pee it's pants with fear.
This whole setup cost me approximately £200. Outrageous.
Based on Jimbo's input, I decided to try upsampling. I downloaded Jriver and set it to something like 32/196. To my ears, it's a horribly shrill sound and removed the bass texture and pure Solidity that had originally won me over.
I spent a few days going down the entire sampling range untill I found 24/96. To me, it sounds superb. Huge soundstage but retained that solidity. Cool!
So what next. Well, more input from Firebottle suggested that using the same LPSU to power both Pi and Allo Boss "Could be a negative" I talked to Jimbo and he'd heard the best way to power this combo was a SMPS for the Pi and the LPSU for the DAC. I tried this but was never convinced that it sounded as clean/transparent.
I went shopping in Chi-Fi heaven and bought a second LPSU.
It arrived at a neighbors yesterday and I've been listening to it this afternoon. OMG. Its transformative in the way of making Eva Cassidy sound like she's in a bloody cavern!
I am really pleased with the second units contribution to this and will be thoroughly enjoying the digital aspect for some time to come.