Any of the 1/4" inputs 1–16 can receive a Line Level signal (i.e. +4dBu or -10dBV). INPUTS 3–16 are fixed at low-impedance (Lo-Z) while INPUTS 1 and 2 can be set to high-impedance (Hi-Z) or low-impedance (Lo-Z) individually. The following are the nominal input level specifications for the sixteen 1/4" (phono) inputs:
INPUT jacks 1–12 (TRS phone type): -46–+4 dBu (variable)
INPUT jacks 13-16 (TRS phone type): -20, -10, +4dBu