Full-Bandwidth Pink Noise Generator (with LED Indicator)


GTC Industries' Noise Plug is a precision pink noise generator built into an XLR microphone connector.  Inside the Noise Plug is an ultra wideband, avalanche junction white noise source.  The output of the white noise source is frequency limited, amplified, and passed through a precision -3db per octave low pass filter.  The result is a full audio spectrum noise source with equal energy distribution in all octaves.

The Noise Plug can be used to check over all audio system operation, adjust speaker crossover points and balance, check frequency response of amplifiers, tape decks and other audio components, and adjust system equalization.  Pink noise is also often used in noise masking systems to reduce annoyance from other noise sources such as heavy machinery and air handling systems.

The Noise Plug is easy to use: simply plug it into a phantom powered microphone input on your mixer and turn up the volume.  A bright red LED indicator on the back of the Noise Plug shows that phantom power is present and that the Noise Plug is operating.  Because it's phantom powered, there are no batteries to go dead or bulky plug-in power supplies to deal with - it's always ready for immediate use.


  • 20 Hz to 20 KHz Precision Reference
  • Accurate 3db Per Octave Rolloff
  • Balanced Mic Level Output
  • Phantom Power Indicator
  • Extremely Compast Design
  • No Batteries Required
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