IGS Audio: PHOTON 500

500 series module Opto-Compressor

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.


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.


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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