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As soon as I plug in a standard 3.5mm jack cable into my speaker AUX IN port they produce a loud disturbing noise exactly as this one: https://en.wikipedia.org/wiki/File:MainsBrum50Hz.ogg. I don't even need to connect a cable to a computer, it's enough for it to be connected to speakers only. My speakers are Creative Inspire S2 Wireless. When I turn up volume, humming is louder. I tried connecting a power supply to another wall outlet, turning off my router but it didn't help. My current guess is that power adaptor is broken. I could get a new one where I live for a couple of dollars. It's worth mentioning that Bluetooth connectivity works completely fine, there is no humming when a device is connected to the speakers that way.

Does it make sense to get a new power adapter in such case?

user1042840
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Why are you plugging a cable into the speakers without having the other end connected to anything?
That's the very definition of 'make a hum noise' - a game played by every guitarist who ever lived, at some point in their career.

It will get worse if you hold any single element of the plug at the other end & get better if you hold both elements with damp fingers, closing the circuit. If it doesn't stop when you do that, the cable or the speaker's socket is broken.

It has nothing to do with your PSU at all.

Tetsujin
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Try to plug both in the same wall outlet to see if the humming disappears. This post probably answers your question:

It's caused by the electrical ground on one piece of equipment being at a slightly different voltage than at other equipment. This causes something like a DC current between your equipment, which your speakers interpret as a hum. The quick and dirty fix is to use a long extension cord (with a 3-prong plug for ground) so your speaker system and computer are plugged into the same wall outlet.

Try to connect the plug to your phone. If the noise vanishes, it is probably the problem, since your phone is eletrically isolated.

You can also try shielded RCA cables to prevent some kind of interference, but it doesn't look like your problem.

neves
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