This is THE reference headphone from Final Audio. It has been in the collection of an ardent headfier for 6-8 months. It has been rarely used and is without a scratch sa he has over 6 top cans. It is sensitive enough to power with most anything but benefits from excellent amplification. This has been the reference headphone of choice at 6Moons for some time and with good reason. Every nuance comes through and with tremendous bass and top to bottom articulation. There's a fun video introduction below.