i have a vent that is too fast and too loud, and it runs off of US standard ac. i was wondering if there is a (good brand name) device that could limit the rms voltage. i don't want a pair of resistors, that would heat up real fast. i need the voltage cut in half, approximately. an analog device would be fine, but it would be even better if i could hook it up to the usb! then i bet i could do all sorts of cool things with all of my household appliances, although my budget is super strict.