From the manual:
Running a Guitar Speaker Cabinet by a Power Amplifier, “Monitor Cab
Off”
For the perfect on-stage setup, the Profiler allows to simultaneously run a guitar speaker-cabinet through a power-
amp, and - at the same time - send a complete studio sound (amplifier plus cabinet and microphone) from the MAIN
OUTPUTS to the front-of-house mixing desk. Since your guitar cabinet doesn’t need to be picked up via microphone
any more, it becomes your personal monitor on stage. The MONITOR OUTPUT features an independent volume
control, as well as a dedicated Monitor Output Equalizer in the Output Menu. These allow you to tailor the sound to
your speaker cabinet, while the sound on the other outputs remain unaffected.
For this setup, you need to bypass the Cabinet Profile for the MONITOR OUTPUT, so as to avoid running a cabinet
simulation through a physical cabinet. The soft button "Monitor Cab Off" in the Output Menu will bypass the Cabinet
Profile for the MONITOR OUTPUT as well as the built-in power-amp of PowerHead and PowerRack, while the
Cabinet Profile stays active for the other outputs including the MAIN OUTPUTS. This is a global setting, and thus
applied to all Rigs. However, the signal from the MONITOR OUTPUT is processed according to the kind of Profile
included in the Rig: for regular Studio Profiles, the CabDriver algorithm is activated, whereas Merged Profiles feed
the direct amp sound to the MONITOR OUTPUT and built-in power-amp.