IGS Audio Photon 500 Opto-Compressor

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Quick Overview

Opto-compressor in 500 series format
IGS Audio Photon 500 Opto-Compressor


The IGS Audio PHOTON 500 is an optical compressor, based on technology from the 60's, first used in the early LA-2A limiters and later in the LA4. As an homage to these legendary products, we packed this technology in a 500-series module. The PHOTON 500 uses an opto-coupler, which introduces negative feedback in the audio path, taking care of gain reduction, being the basics of all compression. The PHOTON 500 has an electronically balanced input with 2520 compatible op-amp in the gain stage. The output is balanced by a Carnhill transformer.


  • Optical Compressor
  • All stepped manipulators
  • Sidechain HPF: OFF, 60Hz, 120Hz
  • Input Impedance (balanced): 10k ohm
  • Output Impedance (balanced): 600 ohm
  • Audio transformers: Carnhill
  • Operating level: +4 dBu
  • Max input level: +20 dBu
  • Max output level: +22 dBu
  • Noise level: -99 dBA
  • Max gain: 30 dB
  • Max gain reduction: 20 dB
  • Ratio: 2:1, 4:1, 12:1
  • Frequency response: 8Hz - 20kHz, +/- 0.1dB
  • THD+N: 0.012%
  • Power consumption: 2.5W

Additional Information

Condition New
Package Contents No
Unit Weight N/A
Channels No
Chassis 500 Series
Module Slot Count 1 Slot
Rack Spaces No
Direct Input No
Digital I/O No
Input Connectors Analog XLR
Output Connectors Analog XLR
MIDI Connections N/A
Impedance N/A
Computer Connection N/A
EQ Type N/A
Tube Complement N/A
Power Consumption N/A

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