Mackie Mackie HM-4

The Mackie HM-4 4-way headphone amplifier is an easy, convenient way to allow up to 4 people listen to the same audio signal. It features one 1/4" stereo input and four 1/4" stereo outputs. The input can accept line-level mono signals, either balanced or unbalanced, or an unbalanced stereo signal. Each of the 4 outputs are unbalanced stereo and have their own volume control.