Tom petty has a nasal voice and bob dylan has a gravelly voice. There is a difference in the complexity of the sound waves produced by both men. What psychological dimension of hearing describes the difference?

Timbre

Timbre is the psychological dimension of hearing that describes the difference.

Timbre is the quality of tone that differentiates two sounds in the same frequency or musical note. Timbre differentiates various types of sound production, such as string instruments, musical instruments, and percussion instruments. Timbre also allows listeners to distinguish different instruments within the same group.