AKG K400 / K500 Jul 13, 2014 11:23:24 GMT Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by solderdude on Jul 13, 2014 11:23:24 GMT Some measurements and impressions on the AKG K400 and K500 headphones are posted on the website.These are oldies and aside from some lack of body and bass extension sound rather good.They can only be found second hand though.