Probably your speakers, have you tried other ones? Cheap speakers sometimes (or OS "power saving" features) turns off various components after being inactive fo

Probably your speakers, have you tried other ones? Cheap speakers sometimes (or OS "power saving" features) turns off various components after being inactive for a while, and when they come alive again, there is a pop happening as electricity enters the circuits. Happens if you turn on whatever the speaker is connected to after turning on the speakers as well, while vice-versa is fine with no pop.