MDR-7506 Studio Reference from Sony Japan.
Endorse of Orange Juice's Sound Quality
Freja's grandfather is Japanese traditional musical instrument "Tsugaru-Syamisen" Famous Player Chikuzan Takahashi's Music Producer "Sadaki Satou". He was contacted with CBS Sony (Chikuzan's CD published from CBS Sony in Japan) wikipedia
As model of MDR-7506 is Japanese Traditional Monitor headphone MDR-CD900ST(Called Red label)'s International usage version. this model Called "Blue label" in Japan.
HD 280 Pro
Studio Reference from Sennheiser Germany.