BT-ADUIO Audio Design Co., Ltd. According to official website, ab Bookshelf Speaker Design Co., Ltd., the style contained in ab speakers comes from the ingenious design of BT-audio audio audio engineers, and a HIFI speaker with a bedroom and study desktop is created, with exquisite and elegant appearance. The manufacturer of ab speaker comes from BT-AUDIO Audio Audio Design Co., Ltd., which is a world-class speaker and speaker manufacturer. Driven by BT-AUDIO's pursuit and love for wood acoustic aesthetics, it has become the most remarkable achievement among wood speaker giants.