凡亲身研制或听过各种类型的改革加弦二胡者,均有一个共同体会:无论何种形状与尺寸的琴筒,其音质、音量都不理想。原因是改革二胡增加弦线后,即会产生以下与原琴筒不相适应的新矛盾:①皮膜基频与琴筒体积不相适应。②增加弦线后,弦压超过皮膜负荷,致使皮膜不能充分振动。为此,我研制 Anyone who has personally researched or listened to any type of reform plus string erhu has a common understanding: no matter what shape and size of the piano, its sound quality and volume are not ideal. The reason is that after the reform of erhu to increase the string, it will produce the following incompatible with the original piano tube new contradictions: ① fundamental frequency and the piano can not adapt to the volume. ② increase the string, the string pressure exceeds the membrane load, resulting in the membrane can not be fully vibrated. To this end, I developed