The MSTC 64 accepts any 12 V or 48 V standard­ized phantom powering, with the maximum sound pressure level being slightly reduced (ca. 4 dB) when powered by 12 V.

The two MK 4g capsules included with the MSTC 64g are a specially selected, matched pair.
The designation MSTC 64g refers to a dual microphone amplifier MSTC 6g equipped with two MK 4g cardioid capsules.