高效率小型低音喇叭結構

http://technews.tw/2017/11/29/tiny-speaker-design-delivers-200x-the-bass/?fbclid=IwAR1TtF-cITRohTSczd_C3KO1Ia2OzDB3xRhzRadb9LtilPxZgIGh-tGQ1uc

https://asa.scitation.org/doi/pdf/10.1121/1.4990010?class=pdf