FAQ What is the official address of Class Audio headquarters? Class Audio headquarters is located at 5070 Franois Cusson, Lachine, Qubec, Canada H8T 1B3.How can I contact Class Audio? You can contact Class Audio by calling 514 636-6384 or faxing at 514 636-142815.What is the model of the Stereo Amplifier? The model of the Stereo Amplifier is CA-301.