Lexicon I-ONIX U22 Owner's Manual page 12

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, but are not harmed by it. 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 docu-
mentation or contact the manufacturer. This switch should be OFF if you
are connecting any line-level source to the Mic In jacks.
8. 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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