The HP60 features six ultra low-noise, high-output PreSonus headphone amplifiers. Audio inputs include two stereo main inputs (A and B), as well as external input for each channel allow the user to mix between three stereo audio streams (mix A, mix B, and external input "more me"). Stereo output is available on each channel to send line level channel mixes to additional headphone amplifiers or monitor systems. Channel controls feature headphone level, mix between inputs A and B, external input v