Help needed with Speaker hum

[ChrisRamirez]

I recently put together a hifi system but I get this awful speaker hum. It stays at a constant volume. It’s also always present no matter which input I’m on. Anyone know what could cause this type of hum (sound recording attached) 

[vogelspinnen]

It's almost certainly a ground loop. Are all your equipment plugged into the same socket, or at least on the same ground circuit?

 

https://www.audioholics.com/home-theater-connection/ground-loops-eliminating-system-hum-and-buzz

 

Here's some reading that might help you.

[Derkoli]

That is absolutely ground loop noise, It's constant on any input and constant on any volume