What does the i stand for in the new SR60i from Grado? Improved, that's what! Yes, Grado has taken one of the world's most legendary headphones and taken it a few steps further. The new SR60i has an upgraded driver design, and they have enlarged and improved the mass distribution in the plastic housing. The way the SR60i's new driver and plastic housing move air and react to sound vibrations are now less affected by transient distortions. With the SR60i you will notice improved control of the upper and lower range of the frequency spectrum with both better supporting Grado's world renowned midrange. And The SR60i will produce a sound that is pure Grado, warm harmonic color, rich full bodied vocals, excellent dynamics and an ultra smooth top end. Listen and Enjoy!