Thank you all for your suggestions.I think one of the amps has an issue with one particular line . I replaced the outlets (psa audio) but it still does it.I discovered when turned on the stove this amp clicks continually. So i just switched them outlets or sides to make it simple. so far no clicking for about a week now.
Is it electrical??? Since only one amp does it and when I plugged the other amp it does not do it;then it's not electrical.
So what could it be?
Again thanks for your inputs.