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 have to put your ear to the speaker to hear any artifact its quite literally no concern. Almost any amplifier will have some audible artifact in that situation. Don' worry'bout it.
Its often quite normal for an amplifier to pick up noise if nothing is connected to its input. Its also normal for the amplifier to buzz if the preamp is connected but not powered up.
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