List of Materials:Argonne 2000 ohm headphones Mini mono jack, screw type Stereo to mono mini jack adapter.This was simple. My headphones are previously unused 2000 ohm Argonne Japanese import antiques and have never seen a jack. A quick trip to Radio Shack to buy a mono mini jack suitable for the ipod and a stereo to mono mini jack adapter was all it took. I screwed the leads in appropriately and the sound is good. There is some stray noise when you hit the bakelite cases of the headphones but the range is good. They are not bass heavy like modern headphones. They are comfortable enough to wear as long as my skullcandy headphones.