Is there a bass in the middle of the erhu playing cavity?

Yes Because erhu fiddle tune is tenor originally, and erhu fiddle tune can be divided into tenor, tenor and bass, and the tune used to be tenor banhu, so erhu fiddle tune is tenor plus tenor. Erhu (pinyin: Erhu) began in the Tang Dynasty and has a history of 1000 years. It is a traditional stringed instrument in China. Erhu, a two-stringed instrument, is also called "South Lake" and "Omz". Erhu is one of the main bowstring instruments in China national musical instrument family. The timbre of erhu is almost the same as that of human voice, and it has the feeling of singing and talking.