Ah, the Sennheiser HD-580! This is an elite headphone, with quite a reputation! For many years, the Sennheiser HD-580 has been lauded by stereophile magazines for it stellar sound quality and durability. It's a comfortable set of 'phones with soft, velvety earpads. It has a metal band at the top — lesser headphones have plastic instead. It sells for about $120 today — and that's a bargin (it used to retail for $300).
This is an ideal headphone for hours of listening at home, but not a great choice for iPods and other mobile players that simply can't deliver enough power to this full-sized audio headset. These are "Open Air" 'phones meaning, people nearby will be able to hear your music.
Basically, the sound from these 'phones is almost indistinguishable from the Sennheiser HD-650, which retails for about $300. You really need gilded, audiophile ears to tell the difference between the sound of the Sennheiser HD-580 and the HD-600. The one real difference is structural — the HD-600 has a carbon-fiber housing material rather than plastic. The listed specs on the HD-580 are virtually identical to the HD-600, and it sounds quite similar to the HD-650 too.
Available for $125, here from Amazon
(Meticulously filed under: Headphones) with one eye twitching.