So update time on the power supply testing. Richard/Lurch's Sbooster arrived, so was keen to give that a go.
At the same time, the £3 printer cable I had been using was replaced by a Supra 2.0 cable. Only £30, but tight spec 90 Ohm. I know from the experience of my very sensitive rubidium atomic clock that different cables impact the sound audibly.
So I've been A/B testing the Sbooster Vs my 12v switch supply from my Netgear NAS, listening to the same track back to back around 20 times (fun I know).
So the Sbooster is without question superior to just a 12v supply. Soundstage is quite a bit wider, instruments can be picked out more clearly, and everything is "bigger".
So I have to say I'd delighted that I can now hear differences. I was extremely sceptical of streamer differences, so whilst i'm not comparing one to another, the fact that i can hear differences in a single streamer with different power supplies must mean that streamers can't all sound the same.
So then I tried the Temple Audio supercharger, and I "think" that is sounded even better than the Sbooster. Remenber that a few days ago the supercharger sounded identical to the 12v neatgear psu, using a cheap printer cable.
I say I "think", because at this point i remembered that it is a supercapacitor, and it is supposed to charge. A quick call to the owner of the company confirmed that it needs a few hours to charge before critical listening. When I had been A/B testing last week it hadn't been left of for more than 30min.
Therefore I will leave it and the Sbooster on and revisit this evening.