after read and look at review online , I think I find the perfect headphone for the gym , I love the soul by Ludacris sl150 for they full sound but there be a little too bulky for gym . these M-80 's be pretty compact , they look amazing , the material be top notch and feel very durable . now on to the disappointing part : the sound . review hail these headphone as `` amazing sound '' , so since I listen to a variety of music genre , I be excite to try they . I know there be a break-in period of probably 24hrs so for a entire week , I plug they to my pc and have iTunes play all night at 1\/4 volume . the sound be still flat and dull , I have to change the setting to `` bass booster '' to get a decent sound bass , even on dance and hip hop track . all in all , I will keep these because they be so compact but when I be home , I grab my sl150 's . UPDATE : well , I guess I do not give it enough time to break-in or something be loose inside the headphone but all of sudden , they come alive ! the high and mid be clearer and the low can now be feel . sorry about my initial poor review Mr. Kolton , you build a great headphone .