Fostex T40RP Mk III planar magnetic headphone, open back. If you are familiar with the sister model T50RP, this complste open back has surprisingly more bass. Overall less aggressive sounding. listing it used but this is essentially new and yet to break in, it might have 10 hrs of play. Comes with original cable and box and upgraded Brainwavz pads for extra soundstage: this is a,major upgrade, I would have returned them if I had the stock pads only.
eBay