every speaker (speakers, headphones, earphones, etc.) all have a different response curve. Most popular audio equipment boosts the bass for music and games. Most Home theater equipment accentuates the bass and treble for explosions and dialogue clarity.
'Pro' equipment tries to be as flat as possible, meaning that whatever was recorded is what you hear. People are often disappointed by pro equipment because they expect a lot of bass or other richness enhancements found in consumer equipment. To be honest, it takes some getting use to. But once you are use to pro headsets it is extremely difficult to go back. Some of the emotion and character found in consumer equipment is lost, but the clarity and minute details which can be...