Reply to "Noise"

Hi Ardbeg,

I don't think the OP is confused about hiss vs hum, but maybe a little confused as to the distinction between noise and distortion.

Is your hum through the speakers or from the transformers of the PSUs in the components themselves?

In terms of the 'transformers' (actually they're probably SMPSs) for low voltage lighting, then these won't have any effect when the lights are off (no current = no power = no EMI), also the main house lighting will be on a completely different circuit to the mains power distribution making that a less likely source of interference.

For the microwave, there should be an isolation switch somewhere in the kitchen, try turning it off using that and see if the hum goes (if not it's something else - of course it could always be coming in on the mains supply from outside your house).

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