Noise Health Close
 

Figure 1: The laboratory scene for the simulation with 5.1 channel speakers generating subway interior noise (top), a tablet PC, earphones, a two-in-one plug (left bottom), a 2cc coupler, artificial ear, and a sound level meter to measure each subject's preferred volume (right bottom)

Figure 1: The laboratory scene for the simulation with 5.1 channel speakers generating subway interior noise (top), a tablet PC, earphones, a two-in-one plug (left bottom), a 2cc coupler, artificial ear, and a sound level meter to measure each subject's preferred volume (right bottom)