Phys.org:

Lower pitches in voices or music in advertisements lead consumers to infer a larger product size, according to a new study by researchers at Georgia Institute of Technology and Vanderbilt University.

One study found that acoustic pitch differences in voice affects perceptions of size. Participants listened to a radio advertisement for a new sandwich at a fictitious sandwich chain where a spokesperson’s voice was digitally altered to be higher or lower. Participants who heard the ad featuring the lower-pitched voice believed the sandwich was significantly larger than those who heard the higher-pitched version.

So, deep voices make things look bigger? There’s definitely a dirty joke in there somewhere. And I have quite a deep voice.