I got a pair of sp-cmc-4 (at853) with the 4.7k mod from Soundprofessionals. This set I tried one time with the PFA from Naiant, like this: mixpre > pfa (xlr to female miniplug) > minijack > left/right stereo mic. Feeding it phantom power 48v (to be reduced by the PFA).
Would there be any reason to use the mic in from the mixpre? Probably to low volts? (Do i need a batterybox inbetween?)