Impedance. It's a funny word isn't it? Well, it's used often in the world of audio, and it sure wouldn't hurt you to know what it is! Knowing what impedance is can help you wisely choose a pair of headphones based on the output capabilities of your device. Most portable headphones aren't capable of powering high impedance headphones. Other videos in the "All About Headphones" series: Introduction to All About Headphones - http://www.youtube.com/watch?v=dzoHrghjQuQ #1 How do headphones really work? - http://www.youtube.com/watch?v=_W2z-ikIgM0 #2 Open-back vs Closed-back headphones? - https://www.youtube.com/watch?v=DS4T_1UyCHw #3 Are frequency range and spectrum graphs important? - http://www.youtube.com/watch?v=BNYitfi-43I #4 What is headphone impedance? - http://www.youtube.com/watch?v=GQWLuAEelcc #5 What is the perfect pair of headphones? - http://www.youtube.com/watch?v=K6NzECeUjSg