Final Audio Sonorous X

Our favorite all around reference headphone.  This one with few hours, original box and paperwork.  See video here
https://www.youtube.com/watch?v=eeR3ojaXwu4

The below is from 6Moons review.   'Final's Sonorous X also were the best in many ways. Whilst one pays for it in coin and weight, build quality was truly superlative. Sonic payback was vigorously dynamic behaviour of mighty punch, colour pop and exciting vitality. Extreme efficiency for a full-size headphone achieved full lift-off even with an iPod 160GB Classic on raw SPL. It simply left potential untapped which duly presented itself with serious stationary amplification (or top portable amps like ALO Audio's Continental Dual Mono). Despite its energetic intense demeanour, the Sonorous X proved to be a keenly balanced affair. Most astonishing was that despite its sealed nature, it very much sounded like a premium open-backed design. Though its flashy appearance suggests overpriced bling aimed at a Dubai luxury mall, an actual audition with properly elevated ancillaries reveals that the Sonorous X is instead a most thoroughly through-engineered seriously optimized affair where a design team threw all caution to the wind to go for fully broke. From what I've heard and seen, this makes Final of Japan one of the most ambitious and resourceful firms who are currently working the upscale high-performance headphone sector. Colour me unexpectedly impressed, nay blown away!'