These are in very nice condition. Was told these have the sdr mod but I have not taken anything apart to confirm this. Bought this in Dec. from another head fier and found them not to be a match with my older Burson Conductor. I could only imagine how nice these would sound with the right amplifier. I just don't listen to headphones anymore so need to let these go. Also the ear pads need to be replaced. They work as is but I don't think they seal the best. Thanks for looking and will reply in the order I receive PM. Be patient I only respond from home on my computer and I do work.