Front Panel Stereo Aux Input for each Channel, Master Volume Control w/ Eight Segment LED Metering, Front Panel Direct In Jack, Connects and Drives up to 18 Headphones Simultaneously, XLR and 1/4" Main Inputs and Outputs, Dual Function Balance/Mix Control per Channel, Individual Output Level Control per Channel, One Front and Two Rear Mounted Headphone Jacks per Channel, Precision Four Segment LED Metering Per Channel, Six Independent High-Power Headphone Amplifier Channels, Multiple Monitoring Settings per Channel, six-channel stereo headphone amplifier, Parallel Main Outputs for Multiple Unit Use