I own a Clevo P150EM Laptop and I've noticed something quite odd. When listening to music using my large powered speakers or my Bose QC15's, it sounds just fine, great actually. But when I plug in my Etymotic HF5's or even my old JVC HARX500's, the sound gets very Tinny. I have updated to the latest Realtek drivers, then I uninstalled Realtek altogether and the issue persisted. When I plug the headphones into my usb mixer though, they sound fine again. The issue only appears to pertain to the Audio jack on the laptop. Could this be because of the built in sound card in the laptop? Does it require powered speakers to function properly?