FLAT LOW FREQUENCY LOUDSPEAKER Russian patent published in 2021 - IPC H04R9/06 

FIELD: acoustics; loudspeakers.

SUBSTANCE: flat low frequency loudspeaker includes a support frame, a sound-emitting membrane, a magnetic core, a permanent magnet installed inside the magnetic core, and a movable coil. The sound-emitting membrane is fixed to the support frame through a foam damper. The magnetic core is rigidly fixed to the support frame. The permanent magnet is installed so that it is rigidly fixed to the magnetic core from the end, and a gap is formed between the side surface of the magnet and the magnetic core. The movable coil is rigidly fixed to the sound-emitting membrane and is made to move in the gap between the magnet and the magnetic core. A centering rim is installed on the support frame, which ensures that the coil is held in the gap between the magnet and the magnetic core.

EFFECT: increased sound quality in the low and sub-low frequencies of the acoustic range.

8 cl, 9 dwg