AC Hum on Laptops

If any of them are designed to work in Europe or US they should be able to run unearthed.

BTW - looking at the cord that came with it I only just realised now the 360 is also unearthed.

maby i should call some electricians and ask what will happen to me/laptop if it runs unearthed? and then just cut the wire off?
 
Check how all these devices are plugged in. Does this problem arise if you go to a different location and/or use different extension leads?

i've tried telling myself its worse when i plug the laptop in on the same extension as all the other devices, however it is always there, so i dont think its that.

another thing i've heard is the ground cable of the laptop and the one of the amp may cause a ground loop problem, which i now see on the di_box is fixed by the di_box, so maby its that, lemme try and get hold of a DI_box thing and see if its fixed

thanks
 
another thing i've heard is the ground cable of the laptop and the one of the amp may cause a ground loop problem,
thanks

I would only expect that to happen if live/neutral were swapped on one of the devices.

You could try an isolation transformer for one of the devices - nope I don't know where to source one, used to get such things from Hamrad.
 
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