Magnetic circuit of loudspeaker and loudspeaker

A magnetic circuit of a loudspeaker, comprising:

• a T-yoke with a base and a columnar portion protruding upward from the base;
• a magnetic steel arranged on the base;
• and
• a front sheet arranged on the magnetic steel,
• wherein the magnetic steel and the front sheet are arranged around a periphery of the columnar portion,
• the magnetic circuit further comprising a first short-circuit ring arranged on an inner side of the magnetic steel and a second short-circuit ring arranged on an inner side of the front sheet;
• an inwardly recessed groove is provided on an outer surface of the columnar portion of the T-yoke, and the groove is provided corresponding to the second short-circuit ring and configured to be equal to the second short-circuit ring in height;
• and
• an inner surface of the front sheet is provided with a mounting slot, and the second short-circuit ring is embedded in the mounting slot, the first short-circuit ring is located below the second short-circuit ring.