system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: In music production, you generally don't want multiple low bass voices because of phase cancellation. Why then do bands and orchestras usually have more than one bass voice, and phase cancellation doesnt seem to be an issue?
gpt
Phase cancellation only really exists in the recorded music world. In acoustic music, it’s extremely difficult to produce two waves at a perfect 180° phase with each other, and once you factor in complex overtones and slight variations in tuning, two acoustic instruments (or two singers) are almost never going to phase cancel, and if they do, it’s only fleeting. Two recorded and auto tuned voices are much more likely to phase cancel, especially if it’s two recordings of the same person or instrument. 

Also, outside of the studio, you can’t change the volume on specific instruments easily, and bass voices, particularly singers, tend to be harder to hear than their treble counterparts, so ensembles are forced to pile in as many of them as possible.