PSU chassis – grounding, earthing & shielding questions

[Decek]

Hi,

I am building a dedicated power supply chassis for my preamps. I want to have a box with 3 independent power supplies for L & R channel plus volume control (Muses from Academy Audio).

My system:

• Miro’s DAC based on AD 1862, common ground for L & R channel
• Preamps (BA3 & Wayne's 2018 Linestage), dedicated grounds for L & R
• 2x Aleph J monoblocks

Power supply for preamps:

• 2x Salas shunt regulator for L & R channel +-24V
• 1x Mark’s VDRN (not populated yet) for Academy Audio VCU Muses 72320 volume control +-15V

Questions to preamp PSU:

• All PSU will be connected via dedicated CL-130 (50 Ohm). I have those available. Is 50 Ohm ok or better to use 10 Ohm resistor 2W (also o?
• Earthing from power chassis to the preamp chassis. I can use one of the wires for that. It is 0.5mm2 = 20 AWG copper. Sufficient?
• Shielding. The cable has mesh shield – picture. I can connect the shielding to metal plugs on both sides. This will form another earthing connection between Preamp chassis and the PSU chassis. Is that a right way of doing that?
• I do not connect left and right channel grounds at any point expect the Muses volume control. I assume this is the best option as per Academy Audio Manual: “The VCU board features separate connections for the Left (Com_L) and Right (Com_R) analog grounds. These grounds are connected on the board to minimize cross talk. It is recommended to use isolated ground audio connectors to ensure the lowest cross talk and noise pick-up.”

Few pictures attached.

Thanks

 

[Speedskater]

a] connect the AC power Safety Ground/Protective Earth to the metal chassis near where the power enters.
b] do NOT connect any of the DC supplies commons to the power supply chassis.
Connect them to their audio circuit chassis.
c] attach all shields to the chassis near their connector.

 

[Decek]

Thanks.
I am not clear about the point b. Should i connect 3 grounds from the preamps and volume control via CL to the preamp chassis?