You said you were playing a CD of a female voice and it sounded shrill in the low treble. That is the sound of female vocals on major label CDs from the 80s and 90s. Female vocals sounded terrible on CD but not on LP because the major companies were using crummy analogue-to-digital converters. Emmylou Harris was poorly served for example. Joni Mitchell's Dog Eat Dog sounded terrible too.
Try a jazz CD.