https://www.soundstagehifi.com/index.php/reference-components/1786-recommended-reference-component-yamaha-yh-5000se-headphones

In his summation, Geoffrey described the YH-5000SE headphones as “beautifully built and engineered” and “remarkably comfortable.” They sounded “well balanced” without being “analytically boring,” and “open and airy while retaining precision in the soundstage.” He went on to say that they were “hugely open, with perfectly fast transients.” Geoffrey also found that the bass extended “remarkably deep while remaining in balance with the midrange and treble.” While the treble was “excellent” he thought it was just “not quite as perfect.”

https://www.enjoythemusic.com/magazine/equipment/0721/LSA_Diamond_Headphones_Review.htm

Listening since 1979 to high-end gear and thousands of headphones the Diamond is one of the best designs for comfort and inner detail I have experienced.

Sound reproduction was explosive and dynamic. The Diamond had nailed the midrange and the treble and bass were outstanding. The transducer’s ability to extract detail was exceptional.

The Diamond’s strengths far outweigh any deficiency. Is it perfect? I have heard better layering in soundstage but usually with much higher priced headphones. Priced at $1999 this is a sure bet for any enthusiast looking for exceptional top-tier performance.

The advantages however, besides increased situational awareness, is an improved stereo image. Just like when you listen with a pair of loudspeakers, the room and the reflections within it play a part in the sound you hear. It’s a bit like listening to a pair of near field loudspeakers, but with holographic imaging and the obvious awareness of the headphones clamped to your head.

The driver diaphragm comprises a nickel-coated carbon-fibre composite dome which dissipates and suppresses excessive vibration effectively, and is lightweight and rigid with a highly elastic driver surround. It is driven by a copper clad aluminium coil and a 24.5mm, 350KJ/M rare earth Neodymium magnet