I purchase the Koss pro-100 on a whim because the Sennheiser that I want be out of stock . I usually do my homework but I trust the review . I be thoroughly disappoint with the lack there of bass response . I be glad I buy these in store because pay return shipping would have anger I immensely . the mid ring and high be average at best . at 79 dollar they be extremely over price for the sound quality that it produce .