I feel like a butthead for sitting on these for several months. Normally I bury these modded headphone reviews and analysis into this thread: https://www.superbestaudiofriends.org/index.php?threads/rhythmdevils-modded-orthos.11649/ This time around, I felt differently, much differently. This one most certainly deserves it's own thread. And oh, by the way, the "Audeze x Rhythmdevils" and "Definitive Edition" was my touch 100%. No one put me up to it. This is how much I'm impressed with it. Or maybe it's those shiny new Western Electric 300B tubes affecting my mind. Whitney has been sending me a bunch of modded headphones for the past year. Most of them are good. Some of them are very good. He solicits input and I tell him how it is without bullshiting or fluffing him up. This is why he sends stuff to me, being ever super duper patient until I get to them. Then going back to his lab, tweaking stuff iteratively, until something really specially happens. Wanna know a secret about good audio gear? It's that last 5% of performance that makes something click. And that last 5% takes 95% of the effort. The Audeze x RhythmDevils LCD-X Definitive Edition is f'ing good. These are overall the best Audeze headphones I have ever heard. It's not even close. Tonally it's the best. Technical performance, maybe the LCD-4 just pips it a bit (and this was a handpicked LCD-4 from a dozen). Note that I have not heard Audeze's latest and greatest. If I had to use a Japanese RPG character tiering system, I'd give the tonal signature an S- and technical performance A+. Please understand that I am super stingy as the only transducer I'd give a tonal signature of S would the Gaudio Nair IEM. For technical performance, only the Utopia (S) and LCD-4 (S-) are above it. HD800 equals it at A+. But really, none of these tiers matter. What's important is that the music from these headphones speak to me, convey the music emotionally. S-tier and A-tier only belong to the best. Ten films shouldn't be nominated for Best Picture, more like three.