Triton Audio Phantom Blocker

In-line phantom power blocker for mic preamps that leaves audio signal intact
Brands: Triton Audio

Triton Audio Phantom Blocker

The Triton Audio Phantom Blocker blocks phantom power while leaving the audio signal intact. phantom power can be applied to either the male or the female side of Phantom Blocker’s XLR connector and will not reach the opposing XLR connector while the audio signal travels without restriction in both directions.


Some (older) preamps are sensitive for phantom power at the input. The preamp’s input transformer cannot handle phantom power from another source. The transformer’s thin silk isolations can burn out because a burst of phantom power switching on creates a high voltage in the input transformer, to prevent this a complete blocking is needed.


When connecting an unbalanced TRS to XLR cable pin 3 of the XLR connector is directly connected to ground, creating a short, this can damage input transformers and under-dimensioned phantom power circuits.


Phantom blocker is a great solution to protect the output of any device connected to the XLR input of a mixing desk or preamp which has phantom power switched on, e.g. your computers audio interface.


There are microphones (mainly ribbon microphones) which do not tolerate phantom power. Connecting a ribbon microphone to a cable which has phantom power applied sends a rush of current through the microphones transformer, this current gets amplified by the transformer into the primary circuit of the microphone and forces the ribbon out of the magnetic field it is suspended in, this can permanently stretch the ribbon.


  • Blocks phantom power while leaving the audio signal intact
  • For microphone preamps, microphones, device outputs, or anything else you wish to protect from phantom power

Please note: Before connecting the device you wish to shield from phantom power make sure Phantom blocker is attached, have phantom power switched on and wait 5 seconds during which Phantom blockers internal bleeder resistors will cancel out voltage differences. Connecting in this order prevents the transfer of an initial AC voltage burst created by the phantom power switching on.

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