Synthesizers with headphone output

On headphones

— a headphone jack is usually a mini-Jack 3.5 mm or Jack 6.35 mm standard (the former is more popular in the “ears”, the latter is more reliable, while both connectors are compatible through the simplest adapters). Headphones can be an perfect alternative to built-in speakers when you don't want to play "out loud" — for example, if you need to rehearse late, or if you need to brush up on notes before a performance. In addition, some synthesizers do not have built-in acoustics at all, and you can listen to them only through “ears” or external speakers.