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The PFA phantom power adaptor allows low-voltage, “active”, or 12V T-power microphones to connect to standard phantom-powered microphone inputs.
The PFA phantom power adaptor is also available for unpowered high-impedance instrument “DI” input, and a low-noise +26dB version for dynamic ribbon and moving-coil microphone input. These versions do not pass phantom power to connected instruments or dynamic microphones.
Please confirm that your microphone will be compatible with the PFA phantom power adaptor wiring configuration selected.
PFA phantom power adaptor 3.5mm minijack adaptor wiring configuration
There are several common methods of wiring input jacks for miniplug microphones, which are not compatible:
- Mono PC microphone (Soundblaster® format): tip = signal (6.8KΩ termination to ground); ring = power (+8V across 2kΩ); sleeve = ground.
- Mono plug-in power (“PIP”): tip & ring = signal + power (+8V across 6.8KΩ); sleeve = ground.
- Mono Sennheiser® compatible: tip = signal + power (+8V across 6.8KΩ); ring = no connection; sleeve = ground.
- Stereo plug-in power (“PIP”): tip = left + power (+8V across 6.8KΩ); ring = right + power (+8V across 6.8KΩ); sleeve = ground.
A microphone wired with separate signal (tip) and power (ring) leads will only be compatible with the PC microphone format.
Some microphones intended for use with PCs are wired with tip and ring as common for signal and power. Such microphones will work with any of the above PFA formats, but will work best with a mono PIP or Sennheiser® format adaptor.
Mono microphones wired with tip-sleeve (no ring) connectors or with tip-ring-sleeve with ring and sleeve in common will only be compatible with Sennheiser® format.
Mono microphones wired with tip-ring-sleeve connectors with ring unconnected will not work with the PC adaptor format, but will work with mono PIP or Sennheiser® format.
Stereo PIP miniplug microphones are normally wired as:
- tip: left signal + power
- ring: right signal + power
- sleeve: ground
That format is only compatible with the stereo minijack PFA phantom power adaptor. The PFA will have two XLR outputs; the XLR connected to the 3.5mm minijack ring will be identified with a red ring on the XLR boot.
The voltage and resistance on the PFA’s microphone power supply can be customized as required.
The Lectrosonics®-compatible TA5M configuration does not support Lectrosonics’ “Servo Bias” function; however, the PFA can be made compatible with mics wired for “Servo Bias”. Please specify your microphone’s wiring format according to the Lectrosonics schematic.
The Shure®-compatible TA4M configuration may support both microphone and instrument input if the high-impedance amplifier option is selected.
PFA phantom power adaptor specifications
Type: phantom power adaptor for plug-in power, “active” remote capsule, dynamic, and T-power microphones; DI instrument adaptor.
Phantom Power: +9V to +48V; +24V minimum required for 12T.
Voltage Supplied to Microphones: low-voltage; +8V, “active”; +8V, +12v, or +16V; 12T, +12V.
“Active” Polarization Voltage, standard barrel: +40V (with P48 supply)
“Active” Polarization Voltage, extended barrel: up to +60V (with P12-P48 supply)
Current, per amplifier: 2mA typical for low-voltage microphones; 4mA for +26dB dynamic mic input;
extended barrel polarization voltage circuit adds 1.5mA.
Input Impedance (low-volt microphone, typical): 6KΩ
Input Impedance (DI): 500KΩ
Output Impedance: 150Ω
Recommended Preamp Input Impedance: 1.5KΩ or higher
Total Harmonic Distortion, 1kHz @ -30dBV: less than 0.005%
Maximum Input Level, 1kHz @ 1% THD: +6dBV
Maximum Input Level, 1kHz @ 1% THD, +26dB dynamic mic input: -10dBV (with P48 supply)
Frequency Response: 20Hz to 20kHz
Equivalent Input Noise: -123dBA
Equivalent Input Noise, +26dB dynamic mic input: -129dBA
Equivalent Input Noise, high-impedance input: -117dBA
Weight (typical): 83g (2.9oz)
Dimensions (XLR): 70mm x 19mmø (2 3/4″ x 3/4″ø)
Dimensions (extended XLR): 100mm x 19mmø (4″ x 3/4″ø)
Dimensions (minijack): 35mm x 9mmø (1 3/8″ x 3/8″ø)
Notice of FCC compliance
Pursuant to section 15.103(h), the PFA with +60V polarization voltage is only intended to be run from a battery-powered phantom power supply or microphone preamplifier. It is thus exempt from Part 15 of the FCC rules. The PFA qualifies for exemption as the highest frequency generated by the device is less than 1.705MHz, and it may not be operated from the AC power lines. Use of a PFA with +60V polarization voltage connected to a phantom power supply or microphone preamplifier that is operated from the AC power lines is strictly prohibited under Part 15.