The active front capsule requires 48V phantom power and, at 4.4 mV / Pa, has almost the same sensitivity as a condenser microphone. With its active circuitry, the OD505’s sound is always consistent, regardless of the internal resistance of the microphone preamplifier or length of connecting cables. The passive lower capsule is polarity-rotated, it senses and reduces unwanted handling noise, especially at the lower frequencies.