Speakers are electronic devices which take and convert audio signals into sound. Most electronic speakers are composed of a box, a crossover network, and a driver which converts the signals into sound waves. A series of speakers that are combined to provide a more diverse array of sound are known as speaker systems. Many speaker systems project sound around a listener, and can provide a more spatial or 3D experience. Speakers and speaker systems are found nearly everywhere, including inside most electronic goods like Apple iPhones and Samsung Phones.