Lexicon I-O|22 Owner's Manual page 12

8. 48v PhANTOM POWER BUTTON - MIC/LINE 1 AND MIC/LINE 2
This enables the phantom power to the Mic/Line 1 and Mic/Line 2 inputs.
When it's on, the +48V LED between Mic/Line/Inst Gain knobs 1 and 2
lights on the front panel. Dynamic microphones do not require phantom
power to operate. Most condenser microphones do require phantom power
to operate. If you are unsure about the phantom power requirements for
your microphone, consult your microphone's documentation or contact the
manufacturer. This switch should be OFF if you are connecting any line-
level source to the Mic In jacks.
9. hEADPhONE JACK
The Headphone output accommodates stereo headphones with a 1/4" stereo
plug. This output is the same as those sent to the Main Outputs, but with its
own independent level control.
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