8-channel line mixer totally independent DI Box units in a 1U package for multiple signal corrections/conversions, with 1/4-inch TRS jacks for balanced or unbalanced inputs and XLR jacks for servo-balanced outputs for each channel. Each DI box eliminates impedance mismatch problems and converts any sound source from guitar to speaker inputs into a clean, powerful, hum-free, noise-free, interference-free balanced signal and perfect even for extremely long cable runs. Can be used simultaneously as an 8-channel line mixer with both stereo line and master outputs.