Avid HD OMNI Preamp, I/O, and Monitoring Pro Tools HD Series Interface - Manual (Page 62)

HD OMNI Guide 58
15 Press the MONITOR encoder button to con-
firm the setting.
In some cases the ALT CR Path might use
the same outputs as the MAIN CR Path. In
that case, do not re-trim the ALT speaker
outputs, instead adjust the ALT Control
Room level and calibrate it to match to the
reference set for the MAIN CR Path (in our
example 85 SPL).