Expand your headphone setup with the N-audio HPA1600 Headphone Mixing/Distribution Amplifier. The HPA1600's main input features two stereo inputs for two independent mixes, which are selectable for all outputs. You can create separate mixes, choose who listens to what, and choose the levels. The HPA1600 features an LED output meter, Main 1 and Main 2 switch, plus a Mono/Stereo switch and level control on each channel. From the back of the headphone amp each channel has an extra headphone output and a direct input for adding instruments and vocals.