Low-impedance headphones are in the range 16 to 32 ohms and high-impedance headphones are about 100-600 ohms. As the impedance of a pair of headphones increases, more voltage (at a given current) is required to drive it, and the loudness of the headphones for a given voltage decreases.
Yes, taking to much Vitamin D can cause some people to get diarrhea. Some others may experience constipation from to much Vitamin D.
March 22, 2010 -- Not getting enough vitamin D may cause women problems in the bathroom as well as with their bones. A new study suggests vitamin D deficiency may contribute to pelvic floor disorders like urinary and fecal incontinence.