On the Inspector Panel, you will see the Distance Attention settings, which you can use to adjust the speaker's playback volume. After adding the speaker to the Scene, you will see that it is placed in 2 spheres, the inner and outer. The sizes of the spheres can be different, you can set them according to your preferences. MAX and MIN display the dimensions of the spheres, respectively. However, the inner sphere should be smaller than the outer one. MIN relates to the minimum distance which defines how close to play the sound of full volume. MAX or maximum distance setting determines the distance after which the sounds fade. You can use the spherical gizmo to set Distance Attenuation in the Scene.