I had a problem with my electrical at home. I hope I could get some feedback here.

I experience some electrical spike at home. Whenever anyone switch on or off an electrical appliances, my speaker will "Dup". My friend told me it was irregular voltage. So far, 1 power supply (PC) and 2 DVD players have been toasted.

Should I call TNB or should I call an electrician?

in addition, after checking with my friend regarding electrical bill, I noted that my bill is far higher than my friend whose usage is slightly higher than mine. (No foul play) Is this somehow related?

old home or new home ?

old wiring or new wiring ?

old home but it was rewired by previous owner

sudah kena con

???
I dont understand what u meant
the previous owner rewired his house for his own usage
i know because he left a few spots for future uses (which now is for my use)
I didnt pay him extra for the rewiring work also

anyway, I just want to know if this is 1)TNB, 2)Wiring, or 3)Area problem. and also how to solve it

You need to ask the electrician to test. They got the device to test.

I happen to face this "Pop" from speaker...it just can't explain as someone it happen some time now, whether new devices turn on or not.

But it just gone even without doing anything.
* Almost 2 months it happen

If you switching ON/OFF, either speaker got sound or some light blinking, maybe the switch is dirty with some carbon on the contact. Either change that socket switch or clean it up the contact if you know how.

I have this problem and mostly the light in blinking. I search the switch and clean the contact side.

Also check what recent equipments you add. Sometime is the equipment that cause the problem.

I'll ask the electrician to take a check
before i install my home theater system