P20 / Powerplants Sinewave with Switching power supplys

[Oscar]

Hello guys.
What is your take on this topic?
I got two switching power supplys now that is powering my base modules on the speakers.
So if I plug them in to my p20 they kinda sh*t on my Sinewave and make a big “mark” and THD out gets alot higher than incommin.
Is this the normal thing with switching powersupplys?
I need to have them and my main mark levinson amp in the same circuit otherwise I get hum from one basemoudle.
Do I keep my amps only on the p20 and let my Mark levinson amp eat up that THD and bad sinewave or leave them stright to the wall and keep my source on the p20…

Hope someone has some good answers

[Oscar]

Also anyone know witch prong is the “Live” on the AC inlet of the P20?

[ViperRGD]

Welcome to the forum @Oscar !

In this picture of a USA receptacle, the Ground is on top, the Neutral is the T-slot on the right, the plain vertical slot is the Line input.

In the event that you aren’t asking about a USA P20, this site has similar information for connectors in other countries.

[Oscar]

Thanks!
Sorry I updated my question with a picture
“Normaly” the right one of the 3 prongs would be the Live. But you never know and I dont really want to open it up to see and cant find any picture of the cableing inside

[ViperRGD]

Agreed. I have no reason to think PS Audio would have built it to anything but the applicable standards but that is just my opinion. If the wiring behind the receptacle is visible, the prong connected to the master power switch would be the Line.

[Oscar]

2 switching power supplys

[Oscar]

1 switching power supply.
Why is this happening?

[goblue]

I had somewhat a similar issue where thd out was higher than thd in. I ended up having to have my P15 serviced by PS Audio.