taming female voice

My system consists of meadowlark kestral 2's a birdland odeon lite dac run through a cheap toshiba transport and a cayin ta-30 integrated tube amp with tube audio design speaker cables and interconnects along with the same powercord. The room demensions are 11.5 wide and 14.5 long with french doors open on the long end the speakers are also firing down the longer part of the room. As far as room treatments go, all I have are some pillows stacked against the walls next to the speakers for side reflection.
My problem is that whenever I play female singers they really seem to zing my ears, that being said I dont listen quietly not stupid loud..about 9-10 o'clock on the dac. Male singers seem to not zing the ears. Please offer suggestions! Thanks