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Re:Ear Speakers – Research, Design, and Evolution by JohnBooty on Tuesday August 13, 2019 @03:11AM (#20683480)
These are quite different from other open-back headphones such as HiFiMan, etc.

There's no seal on or around the ears like traditional headphones. Additionally, they sit much farther away from the ears compared to existing headphone designs.

Re:Ear Speakers – Research, Design, and Evolution by falcolas on Tuesday August 13, 2019 @09:51AM (#20685798)
Open ear headphones have no seal, either. The parts that contact your head simply set the distance between your ear and the driver. This is simply open ear headphones being held a set distance from your ear in a slightly different way. Anything else is pure marketing.