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April 30, 2015 at 12:37 am #127755
Having no knowledge of Indonesia I can only guess, so may be entirely wrong, so act accordingly.
It sounds as if you have a serious grounding condition – this could be dangerous, so I would strongly advise you to get this resolved.
The fact that using the H9 makes the louder noise is probably due to effects emphasizing some frequencies more than others.
Get a good electrician very soon !!