Please define open back headphones. Where are they typically used?
Open back headphones have openings (ports) that allow sound to enter and exit through the earcups. Audiophiles and engineers choose this type of headphone because the sound quality is often more natural, transparent, and accurate than closed back headphones. Open back headphones also offer a wide stereo image and increased depth of field. For mixing and mastering, the sound produced by open back headphones more closely approximates monitor speakers.