They absolutely destroy the lows making them almost no existent and increase the highs to the point where they dominate a mix almost completely. As I mentioned in previous updates, adjusting the two volume/mix knobs was the only annoyance. The 2 stars, instead of one, is for the surprisingly thick sole. Range was as good as any similar style earbuds without dropping out over a room away. 5 womens where I normally take a 10. The noise isolation effect really is amazing - it really does block out all the office humdrum sound! Did not want to spring for an expensive pair as I dont need them that often. She had to walk the bike back home. This is a good looking, sturdy case that fits my Sennheiser PXC 550 wireless headphones perfectly. Overall very happy with it!