@akg_ca Thanks for the reply.
I contacted KANTO and they said there's nothing they can do about it since the warranty has ended a long time ago.
Obviously I was willing to pay for the repair or at least find out what's wrong with it so I could take it to local audio repair shop or something but no help at all. Their response was simply the speaker is definitely not working properly but they had no repair center and unable to diagnose and that's was end of it.
Oh well I guess I gotta look for a better quality speakers from now on.
Thanks again for the response!
JK