PRESONUS MP20 User Manual page 7

OVERVIEW
right).
High Gain Headphone Jack Inserting stereo headphones
.
into the jack on the front panel of the MP20 enables the
user to monitor the signals assigned to the Stereo bus.
Ample power has been provided to allow the operator to
hear the processed signals in loud ambient noise
environments such as concert halls or clubs or in control
rooms monitoring at high volume levels.
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