I got these headphones from a second hand record store. They were only five bucks so I wasn’t sure if they would work. They have a large stereo plug and included in the box was a stereo to mono plug (to connect it to consumer audio equipment). Using this plug sound only came out one earpiece. I wonder if this why someone got rid of them. Anyhow, I went to Dick Smith’s and got a stereo to stereo plug and they work fine (and look cool to boot). Yay!