BQEYZ just launched the latest IEM in their Four Seasons series - Autumn.  BQEYZ Autumn uses a dual-cavity acoustic structure, 13mm full-frequency dynamic driver, the air pressure is effectively controlled, the amplitude of the diaphragm is increased, and the vertical soundstage is increased by about 50%, makes it competent for all types of music.   The main feature of the newly launched Autumn is...