What's the difference between suona in big, medium, small and large?

Different sound areas, different timbres and different uses-

Big suona-a bass instrument with a deep voice. It is mostly used for large-scale activities such as sacrifices, ceremonies and parades.

Zhongsuona is a alto instrument with beautiful and lively timbre, which is suitable for all kinds of festive performances.

Xiaosuona is a high-pitched musical instrument, high-pitched and lively, which is often used in festive occasions with alto suona.