Check the listing for details. Behringer Alpha Retro-style Open-back Headphones. Color: Black, Condition: New. Listed at 63.90 USD. Try These Cans on for Size Behringer’s Alpha open-back circumaural headphones have hit stardom status among accomplished studio professionals at Sweetwater. For starters, these industry-grade cans house neodymium 50mm drivers, delivering balanced audio clarity at a formidable 10Hz–28kHz frequency response. As a result, they’re an excellent option for music producers as well as emerging audiophiles. This pair of headphones features an open-back design for a more authentic overall output, getting you as close to your soundstage mix as possible for pin-point mixing and mastering accuracy. Decked out with vintage flair, these ’phones also come with a detachable audio cable, 3.5 to 6.3mm adapter, and zipper case for supreme travel convenience.