Behringer HA8000 V2, Headphone Amplifier System, For stage and studio applications, 8 Independent stereo amplifiers in 1U, 2 Stereo main inputs for two independent mixes from all 8 output channels, 8 Direct inputs, Mono / stereo switch per channel, 6.3 mm Headphone output on both front and rear, Parallel main outputs enable the cascading of several headphones, Planet Earth ""switching power supply"" for maximum flexibility (100 - 240 V ~), Model: 19"", 1 HU