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IGS Audio PHOTON 500-Series Opto Compressor  From IGS

The PHOTON 500 is an optical compressor, based on technology from the 60's, first used in the UREI LA-2A limiter and later in the LA4. As an homage to these legendary products, we packed this technology in a 500-series module.

IGS Audio


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Manufacturer's Description from IGS

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.

Front panel Features:

  • Peak Reduction: controls the gain of the side-chain circuit
  • Hard wire Bypass
  • Ratio: 2:1, 4:1, 12:1
  • Sidechain Hi-Pass filter: Flat, 60, 120Hz
  • London/New York: Advanced compression curve modeling, like SLAM.
  • Output: 12-pole stepped makeup gain. 
IGS Audio

About Manufacturer

IGS Audio is now one the most desired studio equipment brands in Poland and it is continuously expanding internationally. The original IGS Audio products qualify as pretendants to no.1. Clones of other brands produced by Igs Audio are accurate and excellent. 

IGS Audio is all about happiness in success. IGS Audio offers 3 years warranty for all products.

IGS Studio has been operational since 1997. The IGS Audio brand was created in 2003.


  • 500-series module
  • Input impedance: 10kOhm
  • Max input level: +24 dBu
  • Output impedance: 600Ω by Carnhill
  • Maximum Output Level: +32 dBu
  • Total Harmonic Distortion: max 0.5%
  • Frequency response: +/- 0.2 dB 8Hz to 20kHz
  • Gain: 30dB
  • HPF: Off, 60Hz, 120Hz
  • Signal to noise ratio: more than 99 dB
  • Power supply: +/- 16V
  • Power consumption: 110mA
  • Dimensions: 133x37x180mm
  • Weight: 700g
  • 3 year warranty

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Introduction to IGS Audio - Quick n’ Dirty

IGS Audio is now one the most desired studio equipment brands in Poland and it is continuously expanding internationally. With gear ranging from preamps to equalizers, IGS has everything a pro or amateur engineer could ever need. All IGS products are available for SoundPure’s Try-Before-You-Buy program, so if you want to hear how this great gear sounds in your studio with your gear, shoot us an email at ProAudio@SoundPure.com, or call us anytime at 919.682.5552. Thanks for watching!