The semi-anechoic chamber utilizes a flat-panel sound absorption structure for space efficiency. The high-speed drive end reaches a maximum speed of 16,000 RPM and is housed within the chamber, while the load motor power is customizable and placed outside the chamber. The system is equipped with a soundproof cover, temperature control system, and battery simulator to support NVH performance development and testing for electric gearboxes, motors, and powertrains. The maximum noise at the high-speed drive end is less than 65 dB(A), and at 2000 RPM on the load end is less than 45 dB(A).