Phones; Monitor Out - Alesis Studio 12R Reference Manual

Connections

Phones

The [PHONES] jack on the front panel is designed for most stereo
headphones. The internal headphone amplifier outputs the
maximum power allowed by safety standards. The impedance and
efficiency of the headphones will determine the maximum volume
available. Eight-ohm headphones may be louder at a given setting
than 150-ohm or 600-ohm headphones; however, there should be
enough gain to drive any dynamic headphone to reasonable levels,
if the mixer is being run properly.
Note that the PHONES/MONITOR level control on the front panel
affects both the headphone jack on the front panel and the
[MONITOR OUT] balanced jacks on the back panel.

Monitor Out

The [MONITOR OUT] jacks give you a signal that will be the same
as the MAIN OUT, as long as the front panel [MSTR/TAPE] switch
is in the "MSTR" position. The only difference is that the
MONITOR OUT signal is after the front panel PHONES level
control. When that control is up full, the MONITOR OUT jack will
be 10 dB louder than the MAIN OUT. The PHONES control may be
lowered to the point where the MONITOR OUT is almost at
microphone level, low enough to be patched into the microphone-
level inputs of a camcorder or house PA system. However, connect
the monitor output to line level inputs wherever possible.
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Studio 12R Reference manual