2
Phantom powered microphone systems use a 3 pin XLR connector. A phantom powered microphone sys-
tem should use a 48V phantom power supply or signal conditioner for optimum performance; however
these microphone systems may be powered with a 24V or a 12V phantom power supply, but this will lim-
it the maximum output voltage.
Externally Polarized Microphone System
Prepolarized Microphone System
Phantom Powered Microphone System
The phantom powered preamp may be used with either a ¼’’ or a ½’’ microphone cartridge by using the
adapter provided.
All IEC 61094-4 compliant microphones can be used with the phantom powered pre-
amp.
Adapters for Phantom Powered Preamp
4.0
Taking Measurements
The following formula is used to calculate the pressure measured by the microphone from the output volt-
age signal. The sensitivity of a microphone is typically measured at 250 Hz.
Pressure (Pa) = Voltage (mV) / Sensitivity (mV/Pa).
