T2 trouble

[Puma Cat]

Thanks for the reply.
I wonder why there is a problem, because in both cases I've used a popular brand LPS which is working well with other equipment (brand and type), advertised and sold as an upgrade kit for several Lumin models since long time.
Why I've tried twice? Because with the first LPS I had an issues with the DC cable, then received a whole replacement unit, so I didn't expected the Lumin won't start once again.

Is it maybe related to difference in the potentials or differences in the groundings.
I found Lumin strongly advise that the unit should be earthed.
But once we remove the serial SPS and install 2-wiring DC cable, there is no same earthing inside.

The problem only appears when we power the analog section.
The only thing that comes to my mind is that maybe the grounding installation and all other hardware has not a potential of 0 V on the ground path and all housings. The internal circuits of the Lumins are connected to the chassis ground potential and in the event that I remove the IEC socket with earth/ground, the ground will be connected via the first possible path - which will be the shields of the analog cables connected to further devices (amplifier, etc).
If this potential is not equal to 0V, I suspect that the entire voltage reference changes.

I'm sure P1 mini is very good device, but my hope was to see the muscles of T2 using better power supply.

Yeah, I can't speak to the specifics of the various "set-ups" you've tried, as I've no experience with them. It's possible that the "grounding installation" and subsequent problems may lie with the "reference voltage" changes as you've described, but I'm not a EE, so I can't speak to that with any expertise.

What I can speak is to my experience that it's very clear that LUMIN thinks through their designs very carefully and thoroughly, and as such, it's best to use these products in a manner that conforms to their specifications and "guidance".

Also, as a side note: is is possible to design SMPS-powered audio products that don't suffer from the problems typically associated with traditional SMPS or SMPS-powered components (e.g. the impact of high-source leakage impedance current, and it's concomitant impact on threshold jitter). I know, for example, that iFi has a SMPS "wall-wart style" charger that does not have these problems. I'm sure LUMIN is aware of this as well.

Cheers and thanks for the info you posted.