The First Vocational Secondary Professional School of Yulin City, located on Minzhu South Road, Yulin City, is the only state-run secondary vocational school directly under the local Education Bureau. It was founded in 1958 and has its own characteristic school-running philosophy.

In order to further enrich the cultural life of teachers and students in Guangxi Yulin No.1 Vocational Middle School and promote the quality education of students, the school has established a step by modern multi-functional hall classroom. As a company with professional sound expansion system and technology, JSL has built a professional sound expansion system for the school's multi-function hall.

Multi-function hall main sound expansion using 4 AT series 15 inch professional full frequency speakers, 2 AU series 12 inches back listening and 2 S series ultra-bass, AT series professional full frequency speakers, high sound pressure level, low distortion rate, full and natural sound; the classroom surrounded by 12 S series 10 inch full frequency speakers auxiliary supplement the sound, evenly distribute the whole sound field more uniform and clear.

After the construction of the sound expansion system, after many debugging and correction to be used, the effect of the sound expansion system was praised by the school. At the same time, the products and technologies of JSL team were highly recognized!

The JSL brand sound belongs to Guangdong Wanchang technology industrial Co., LTD., Guangdong Wanchang technology industrial Co., LTD is a collection of research and development, production, sales, engineering projects, professional consulting in the integration of modern sound enterprises, with professional technical team and rich experience in expanding sound system structures, can provide customers with first-class system solutions and high quality products.