ad900x air de a technica no pensaron? son super circumaurales y abiertos.
http://www.amazon.com/Technica-ATH-AD900X-Open-Back-Audiophile-Headphones/dp/B009S331VU
http://www.amazon.com/Technica-ATH-AD900X-Open-Back-Audiophile-Headphones/dp/B009S331VU