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https://www.itu.int/rec/T-REC-G.692/_page.print G.692 : Optical interfaces for multichannel systems with optical amplifiers multichannel systems g optical interfaces amplifiers https://www.itu.int/rec/T-REC-G.692-199810-I/en G.692 : Optical interfaces for multichannel systems with optical amplifiers multichannel systems g optical interfaces amplifiers https://www.itu.int/rec/T-REC-G.692/en G.692 : Optical interfaces for multichannel systems with optical amplifiers multichannel systems g optical interfaces amplifiers https://eprints.soton.ac.uk/425681/ Dual frequency band amplitude panning for multichannel audio systems - ePrints Soton audio systems dual frequency band amplitude