The 1714 offers a dedicated headphone amplifier for each of its headphone outputs, so all outputs may play at once. The 1714 allows each user to adjust volume as they audition headphones, using either volume control knobs or up/down buttons. The 1714 allows you to design the right experience for your retail environment. Make individual demo stations of four headphones each with exclusive music selection, or make a large system that shares one music player among all headphones in the entire system.