To provide an efficient muffler system using a speaker for muffling a sound caused by exhaust gas such as an internal-combustion engine, etc.

This system is provided with a loud speaker 10 provided with a magnet system 11 and a vibration system 12 formed from a diaphragm 14 and a vibration coil 15, and the magnet system 11 is provided with a channel 22 along the symmetry axis of the loud speaker, and end parts of exhaust pipes 23, 23, arranged penetrating through the channel 22 and through which the exhaust gas is emitted are projected into a space of a corn shape formed by the diaphragm 14, and a gas anti-osmotic cover 27 is connected to the end parts of the diaphragm 14 and the exhaust pipe 23', and it forms an airtight barrier covering the space between the end part of the exhaust pipe 23' penetrating through the channel 22 and the diaphragm 14.