Sound-mitigating device for a duct system

A duct, comprising:

• a duct body forming a muffler for a vehicle and defining an inlet, an outlet, and a channel connecting the inlet and the outlet, the duct body being configured to direct gas flowing within the channel from the inlet to the outlet and further defining:
• an opening located between the inlet and the outlet;
• and
• one or more sidewalls located about the opening, defining a sidewall perimeter, and extending from the duct body toward an external environment of the duct body;
• a noise attenuator including sound-absorbing material covering the opening, defining a perimeter larger than the sidewall perimeter such that the noise attenuator is housed within the one or more sidewalls through press-fitting, and defining a pair of first faces and a pair of second faces that are larger than the first faces, wherein at least one of the second faces is entirely in direct contact with an external environment of the duct body, the sound-absorbing material being configured to dissipate acoustic energy within the channel to reduce sound created by an engine of the vehicle;
• and
• an acoustic resonator located downstream of the noise attenuator and configured to further dissipate acoustic energy within the channel, where the acoustic resonator is at least one of a quarter-wavelength resonator and a Helmholtz resonator.

A device, comprising:

• a vehicle muffler having a duct defining:
• a channel connecting an inlet and an outlet,
• an opening located between the inlet and the outlet, and
• a sidewall surrounding the opening, defining a sidewall perimeter, and extending toward an external environment of the duct;
• and
• a noise attenuator including sound-absorbing material that covers the opening, dissipates sound within the channel created by an engine of the vehicle, defines a perimeter larger than the sidewall perimeter such that the noise attenuator is housed within the sidewall through press-fitting, and defines a pair of first faces and a pair of second faces that are larger than the first faces with one of the second faces in entirely direct contact with the external environment.