An audio compatible helmet is a helmet that has been designed to work with certain types of audio devices, such as MP3 players or headphones. This means that you can listen to music or other audio files while wearing the helmet, without having to worry about the sound quality being impacted by the helmet itself. Audio compatible helmets typically have special padding or ear cups that help to create a seal around the ears, which helps to reduce outside noise and improve sound quality. In addition, many audio compatible helmets also come with built-in speakers, so you can enjoy your music without having to wear headphones.