Oct 23, · Phantom power, commonly designated as 48V or P48, was designed to power microphones without using bulky external power supplies such as the ones required for tube microphones It's a way of sending the DC electrical current required through a balanced XLR cable We need that voltage to power the diaphragm and the mic's internal ampThe Icicle XLR to USB Converter/Mic Preamp lets you easily connect your favorite microphone directly to your Mac or PC The Blue Icicle performs dual functions as an XLR to USB adapter and a studioquality microphone preamp It features an analog gain control and also provides 48V phantom power for condenser microphonesTXXLR Power Source 2 X AA battery, Sony NPF battery, or MicroUSB Phantom Power Supplies 48 V through XLR input jack Plugin power Supplies plugin power through 35 mm TRS jack Antenna Internal Input Connections XLR with locking collar 1/8" / 35 mm TRS locking minijack socket Input Impedance XLR 1 kOhm 35 mm TRS 10 kOhms What I