I also agree that there may be a grounding problem, but generally, sa home studio setups halos lagi Meron yan, lalo na dito sa pinas na uso ang two prong na plugs at walang ground pin.
Regarding sa ground problem, ang tanong muna ay affected ba yung recorded signal? Kung hindi, gamit ka na lang ng magandang earphones pang monitor.
Kung affected naman yung recorded signal, ergo, narerecord pati yung buzz, getting a PC will not help. Mas prone sa interference yun tower type PCs, and in my experience, yun mismo ang cause ng buzz. In addition, kung sa laptop pa lang may problema ka na, ganun din pag iMac kasi ang internals ng mga bagong Apple computers parang laptop din yan pero walang battery, so practically pareho lang.
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