The main purpose of ANC-Duo is used for suppressing engine exhaust noises, which are usually periodic sounds. It works as feedback control.
ANC-Octet is specialized in suppressing random noises such as road traffic noises. It works as feedforward control.
It is used for ANC-Duo and ANC-Octet. It contains power speaker and microphone amplifiers, and is an all-in-one controller.
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