The Panasonic electret mic measures flat except for a slight rise between 20 kHz and 30 kHz, if I remember correctly. It cannot be calibrated during the REW calibration loop. I used a calibration file 'symphonic' found by Claudio Negro. I copied this file and loaded it into the 'Mic calibration window' within REW configuration.
I used the 2-wire method.
The Phantom Power Supply was inserted in the sound card calibration loop as described in my Quick Pictorial you can find in the T50RP Mod Summary Wiki and in the links listed near the beginning of Post #1 in my Incremental Mods and Measurements thread. For more detailed information, refer to the REW online setup page.
Edited by bluemonkeyflyer - 12/6/12 at 5:38am