Hi Guys! So I'd just like to share to whom ever was wondering. I have already contacted Harman Kardon from the states and relayed me to hong kong then Philippines. Their service center is actually located in Quezon City. They told me to ship the speakers to their service center via LBC and told me that if there is distortion to the sound then it's most likely needed to replace the speaker each speaker will cost at Php 1,500/pc and since there are 2 speakers for this particular unit they need to check whether both speakers need replacement. Their service charge is Php 1,500 as well >_<
So all in all that's an estimate of Php 4,500 + Shipping fee >_< <sigh>