1715 amplifier makes it possible to present the serious listener with a full demonstration of each headphone’s true capabilities. Use our uncompressed audio player, Model 1703, to bring maximum fidelity to your customers. The 1715 amplifier devotes its output to one selected pair of headphones at any one time to ensure optimal performance. It delivers analog audio signals with pristine clarity and smooth frequency response. The installer can adjust the gain on each 1715 to suit the output level appropriate to the sensitivity of the headphones connected to it. Headphones designed for use with smart phones do not require the high gain levels that are needed to drive models that have high impedance or low sensitivity. Each 1715 can be set to deliver just the right audio levels to its four headphone outputs.