Will give it a go. When the walls come thumbling down I'll switch over to 1 transformer / PSU.
Hello Cumbb,... I'm afraid I don't know what you mean with wires between nor the ground connection. The ground of the transformers go to the central earthing point of the mains.
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If you want some cancellation of the toroid fields, I expect that you would have to wire the primaries in each toroid out of phase. I do not think you can ever expect complete cancellation - just a reduction in magnetic field strength in the regions the two transformers are in physical contact with each other. That said, I have never done this, so I am just thinking a loud here. The stray field from a toroid is not smooth ie uniform flux density - its actually quite lumpy due to wire bunching and uneven winding density even on a good quality component. So, a further step here would be to rotate the cores relative to each other to maximize flux cancelation and therefore coupling into the amplifier electronics, and then rotate the complete assembly with respect with the electronics. Again, I have not tried this, and and just guessing here.
And the central earthing points of the mains are connected with the pre or source earth - I hope so.
The minimum "reverse voltages" of the compensation of the power supply voltages of the connected power supplies then ran over the ground lines of the small signal connections (Cinch, DIO...).
What if its a dual mono amp for headphones? All headphone jacks are single ground and so are most source components. Its inevitable the dual mono amp turns into a huge split ground loop. My question is where do you place the ground lift resistor in the amp to break the loop? Nearer by the input or the output? For example when placed by the headphone jack the ground lift resistors would look like a 'Y' with the headphone out jack and the two 10ohm resistors splitting from it, to give you a visual representation.
Most source components are indeed single-ground, and that’s a good thing. Regarding a headphone amp, can I ask why you want to go dual mono?
That aside, if you have to have a common ground output as in your case, you have to focus on keeping the ground loop areas as small as possible. Another option here is to split the left and right and have separate sockets - but then you would have to require your headphones, unfortunately.
That aside, if you have to have a common ground output as in your case, you have to focus on keeping the ground loop areas as small as possible. Another option here is to split the left and right and have separate sockets - but then you would have to require your headphones, unfortunately.