I have 50hz noise from the speakers. its not the hiss from the tweeter. It’s from the mid. (Rrrrrrr) the noise is exists even when only the power is connected to the speaker with no source and preamp. the problem could be from the electricity in my home or it’s the amp
If you want to test to see if the issue is the amp you could try putting shorting plugs on the amps inputs. Then power the amp on and see if the noise is still present.
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