[. . . ] PHANTOM POWER The MX122 Phantom Power is applied to the XLR input when the jumper connects the right two pins as you face the rear of the unit. [. . . ] We suggest saving the shipping carton and packing materials for safely transporting the unit in the future. Please visit our website at www. rolls. com and click on the Register Warranty Here text, then fill out the Warranty Registration info to register your MX122. FEATURES · 1 XLR balanced Mic Input with rear panel Trim control · +12VDC Phantom Power · 4 individual 1/4" Stereo Inputs · Balanced 1/4" TRS Outputs · Balance control on each channel (Pan on the Mic channel) · Headphone / Auxiliary Outputs · External Power Supply included for low noise operation SCHEMATIC FRONT PANEL DESCRIPTION PHONE/AUX OUTPUTS MIC LEVEL R PAN L LEVEL R BAL L LEVEL R BAL L LEVEL R BAL L LEVEL R BAL L MASTER LEVEL PHONE/AUX LEVEL pwr Channel One Mic Level: Adjusts the signal level of the microphone preamp circuitry. Pan: Adjusts the relative level of the microphone signal to the Right and Left Outputs. Channel Two - Five Section Level: Adjusts the overall signal level of the channel. Bal: Adjusts the relative level of the channel signal to the Right and Left outputs. Phone/Aux Outputs: 1/4" and 1/8" (3. 5mm) TRS stereo jacks for monitoring the master right and left signals, also may be used as an alternative stereo output for connecting to another stereo amplifier. REAR PANEL 12 VDC: Connects to the included Rolls PS27 12 VDC power supply. [. . . ] Phantom Power: Jumper connector for applying +12V phantom power to the Mic XLR Input jack. [. . . ]