Why can’t human voices be “out of phase”

[Bearitone]

Kind of a stoner question here but this has been on my mind:

I know I can wire two speakers out of phase and get destructive interference. Why can’t two human voices or singers ever be out of phase? Assuming no electronics involved regarding the singers.

 

[MikeH]

Either you're so stoned that the question doesn't make sense, or I'm too stoned to understand it...

 

[lost_horizon]

They have to be exactly the same, get one voice, split it into two channels and put it in a stereo amp and it will phase cancel.

It's a physical thing, they would have to be facing each other and if they hit the same note the same way from the different directions they would phase cancel in the middle.

 

[Grindspine]

Two human voices definitely can be out of phase.

 

[Hollowway]

I think any two sound sources can, but maybe it’s because there are so many small constructive and destructive changes that it’s not noticeable?

I’d think that if you had two people with similar timbres singing the same line in unison it would be enough be noticeable, but I don’t know enough about it to know. Now I’m wondering, too!

 

[Bodes]

Take my word for it, I've definitely heard many people's voices completely 180° out of phase with any form of coherent thought process.