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Unless physics has changed, I think headphones are the only way to do this.

Directional speakers exist and are very effective actually. Whether this device is using one, I have no idea.

You can't create a "bubble" of sound unless that just a marketing term for quiet and facing only the user.

Well I don't know about a bubble of sound, but there are "sound lasers"

go about 2:14 into that video. also outside of this argument, that is really cool either way. thanks for sending!