One layer is good.

1. The seats on the first floor of Xi'an Concert Hall are closer to the stage. The audience can see the performers' facial expressions, movements and playing skills more clearly, and can feel the charm of the music more directly. The viewing angle of the seats on the second floor is high, which easily creates a sense of distance between the audience and the stage, affecting the viewing experience.

2. Since the seats on the first floor are closer to the stage, the audience can receive the sounds of instruments and singers more directly, feel the details and layers of music more accurately, and enjoy a purer music experience. In the second-floor seats, the sound received by the audience will be diffused and reflected, resulting in a loss of sound quality. So the first floor of Xi'an Concert Hall is good.