The top-of-the-range Grado headphone model SR325i. Grado has taken one of the world's most acclaimed headphones, and pushed it a few steps further. The new SR325i has an upgraded driver design, and an enlarged and improved mass distribution in the metal housing. The way the SR325i's new driver and metal housing move air and react to sound vibrations are now less affected by transient distortions. With the SR325i you will notice improved control of the upper and lower range of the frequency spectrum, providing a quality audio envelope to Grado's world renowned midrange. The SR325i will produce a sound that is pure Grado, warm harmonic color, rich full bodied vocals, excellent dynamics and an ultra smooth top end.