Pioneer HDJ-1000 DJ Headphones Whether a DJ, studio musician, sound engineer or just an avid music listener, the HDJ-1000 is the answer to all of your headphone needs. Large diameter speaker units. Folding housing with universal joints. Stereo/Mono selector switch allows mix of left and right channel signals for single ear monitoring. Removable 1/4" jack reveals mini plug for flexible connections, includes carrying case.