Harmon/kardon speaker problem in south korea

hello-
i have a set of harmon/kardon "champagne" speakers (model HK 695) that i bought a few years ago at the apple store. they have worked great since in the states and in turkey, where i had to convert the power source from 220v to 110v. i used a fairly large, plug-in-style converter that had a fuse b/c i was paranoid about blowing the speakers out (i found out later that the bass unit also has its own fuse).
this week i have moved to a new school in seoul, south korea and i have started to have some problems. when i plug the speakers in (with the power source converted to 110v) i get feedback, like wind blowing through the speakers. it doesn't matter if the jack is plugged in to the computer/ipod or not, there is a constant "whoosh-whooshing" sound that is driving me nuts.
what's going on? i haven't had a single problem in 4 years. i'm not very good with a/v stuff, so if anyone has any ideas as to what may be the problem, or more importantly, how to fix the problem, i would appreciate any help.
thanks,
jesse
seoul, south korea
ibook g3 dual usb   Mac OS X (10.4.7)  

i'm not sure if the outlets are grounded. it's a brand-new building, completes in may, designed to "western standards." i'll check with the electricians at the school to see if they know.
i've tried several things: different outlets, different converters, with other electronics around it and without. like i sais, no problems in the states or in turkey, where power surges are the norm. i'll check on the mh thing.
if this is the problem, how do i fix it?
thanks again,
jesse

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