Grado Labs SR325IS headphone

18 - 24000 Hz, 98 mW, 32ohm, Dynamic, Open air What does the i stand for in the new SR325is from Grado? Improved, that's what! Yes, Grado has taken one of the world's most acclaimed headphones and taken it a few steps further. The new SR325is has an upgraded driver and cable design. The way the SR325is driver, cable and metal housing move air and react to sound vibrations are now less affected by transient distortions. With the new 8 conductor cable design you will notice improved control and stability of the upper and lower range of the frequency spectrum with both better supporting Grado's world renowned midrange. The SR325is 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!