- Plusspeaker Inc
- speaker, loudspeaker, subwoofer, carspeaker, caraudio.
- Address:1404 Wai Wah Bldg - 6 Wilmer Street - Sheung Wan hongkong Hong Kong
- Shanghai ChengYun Stereo Set Limited Company
- carspeaker.
- Address:7areas NO23. 202room Qixin rd 3,333 Lane hall of Minhang District. Shanghai China Shanghai 201101 China
- Yueda Electroacoustic Equipment Co. Ltd.
- loudspeaker, carspeaker.
- Address:South Street, Zeng Ping Town, Wujin, Changzhou Jiangsu 213173 China
1