Features:

Vented diaphragm
Non Resonant air chamber
Standard copper voice coil wire
Standard copper connecting cord
mini plug with 1/4" adaptor

Tranducer type
 dynamic 
Operating principle open air 
Frequency response 20-20
SPL 1mV 98
Normal impedance 32ohms
Driver matched db .1

Built on the same features as the SR60, but utilizes a 4 conductor connecting cable and larger ear cushions, the result of which gives a more open stage. The SR80i provides an improved bass resonance, which enhances the overall detail. John Grado says he strove for the best sounding phones for the money, and with the glowing reviews the SR80's have received, who can argue.

"...these are truly wonderful hearphones, they've got the bass energy... ripping into heavy tracks with a gusto that eludes lesser rivals. With vocals they intoxicate with a natural feel and beautifully proportioned soundstage: few headphones can transport you as convincingly... The Grado SR80's are special. Buy'em, and Love'em."

ROLL OF HONOR.
What HI-FI
"Creating a stereo image of excellent depth and clarity, they ensure every detail is heard, every strand separated."
First Headphone ever awarded a "GOLDEN NOTE AWARD" Presented by the Academy for the Advancement of High End Audio.
Winner of Audio Video's "GRAND PRIX AWARD"
"In the recording studio or for the serious hobbyist, I can't think of a more versatile or dimensionally satisfying personal speaker system."
Fi magazine / Vol. 2, No. 4 / Anthony Chiarella
"It figures that these Brooklyn-made phones would kick some serious butt. These babies have a pretty big sound; a powerful, tight bottom end, very articulate midrange, and a good top end. They have an airy, open quality-less in your head then most phones near their price."
Audio Video / Vol. 1, No. 4 / Steve Guttenberg
"If you are looking for a headphone to use as a reference, you may want to go up the line. To me, the SR80 is the price-performance winner."
Pro Audio Review / Vol. 2, No. 5 / Tom Jung, DMP recordings