I just got an email from Yamaha touting their two new headphones, the fullsize HPH-200 and the IEM EPH-100. Yamaha is very forthcoming in admitting that they don't make their own headphones, and that they're built with another company's assistance. In the past, it was obvious that their RH10MS headphones were just rebranded Ultrasone HFI-450's. What about these current models, any idea which brand and model they are, or are they custom?
At first glance, I'm assuming that they're Grado, but the impedance is 48 Ohm. What do you guys say?