The PPA (Phantom Power Adapter) is designed for connection of the OKM to 48volt phantom powered studio mixers or pre-amps. It provides optimum voltage for the OKMs, and transformer isolated balanced mic level inputs. The improvement in signal to noise is significant when compared to the A3 (<8dB), and the headroom is slightly improved.

The unit requires no battery, but uses the mixer/pre-amp's 48V to power the circuitry that provides the bias voltage for the microphones. The mics are isolated from the 48V by two mini audio transformers.