A system comprising: an air intake or exhaust section for use within a power generation unit and a plurality of Active Noise Control (ANC) module units , wherein each Active Noise Control (ANC) module unit is configured to be installed within the air intake or exhaust section of the power generation unit, each Active Noise Control (ANC) module unit comprising: • an ANC housing shaped to fit within the air intake or exhaust section and • an ANC core configured to be secured within the ANC housing , the ANC core comprising ∘ a number of different speakers/shakers , ∘ at least one microphone configured to detect a sound generated by the power generation unit, and ∘ a control board configured to control the noise-cancelling sound based on the sound signal from the microphone and a set of pre-determined noise reduction transfer functions, wherein the speakers/shakers are connected to the control board and the control board is configured to receive a sound signal from the microphone and control a noise-cancelling sound to be delivered from the speakers/shakers to the air intake or exhaust section , and wherein the control board comprises transfer functions pre-determined for multiple inputs and configured to process the noise-cancelling sound signals to be generated by each speaker or shaker separately based on the location-specific characteristics of each combination of microphones and speakers orshakers (48/49). an air intake or exhaust section for use within a power generation unit and a plurality of Active Noise Control (ANC) module units , wherein each Active Noise Control (ANC) module unit is configured to be installed within the air intake or exhaust section of the power generation unit, each Active Noise Control (ANC) module unit comprising: • an ANC housing shaped to fit within the air intake or exhaust section and • an ANC core configured to be secured within the ANC housing , the ANC core comprising ∘ a number of different speakers/shakers , ∘ at least one microphone configured to detect a sound generated by the power generation unit, and ∘ a control board configured to control the noise-cancelling sound based on the sound signal from the microphone and a set of pre-determined noise reduction transfer functions, • an ANC housing shaped to fit within the air intake or exhaust section and • an ANC core configured to be secured within the ANC housing , the ANC core comprising ∘ a number of different speakers/shakers , ∘ at least one microphone configured to detect a sound generated by the power generation unit, and ∘ a control board configured to control the noise-cancelling sound based on the sound signal from the microphone and a set of pre-determined noise reduction transfer functions, ∘ a number of different speakers/shakers , ∘ at least one microphone configured to detect a sound generated by the power generation unit, and ∘ a control board configured to control the noise-cancelling sound based on the sound signal from the microphone and a set of pre-determined noise reduction transfer functions, wherein the speakers/shakers are connected to the control board and the control board is configured to receive a sound signal from the microphone and control a noise-cancelling sound to be delivered from the speakers/shakers to the air intake or exhaust section , and wherein the control board comprises transfer functions pre-determined for multiple inputs and configured to process the noise-cancelling sound signals to be generated by each speaker or shaker separately based on the location-specific characteristics of each combination of microphones and speakers orshakers (48/49). <EOS>