Rare, like-new Grell OAE1 signature open-back headphones for sale. I was drawn to the design, reminiscent of the SONY MDR-F1 I used to own, and purchased these. This is a limited-edition, initial model, open-back headphones specialized for forward soundstage. Axel Grell, who worked at Sennheiser from 1991, is known as the developer who worked on Sennheiser's flagship models that remain in Sennheiser's history, such as the HD600, HD650, and HD800. The Grell OAE1 is a headphone developed by the independent Axel Grell, embodying his own philosophy. A 4.4mm balanced cable, a 3.5mm cable (with a 6.3mm adapter), and a carrying case are included. I used them a few times and then stored them. I am selling them to organize my collection. All accessories are included. Negotiations for price reduction are not possible.