@Joong - The H1's has that famous planar bass, where the Edition X is more refined and less attacking at both ends of the spectrum. The H1's has tight and well layered bass, with very quick decay and fairly linear all the way down. Sub-bass is strong, authoritative and not muddy. The H1's bass is tightly woven in to the rest of the sound spectrum and doesn't overshadow the mid-range, nor the treble. In fact the high's are very present and clear, could be bright but more exacting yet musical! I love the H1's bass presentation more than the Edition X which sometimes comes across as too laid back and sleepy, it's fine on some genres where I just want to relax but can feel soft on other genres that require more bite! I've always felt the Edition X would be a worthy upgrade from the HD600's as I feel they are very similarly tuned! The Edition X is for me, a very relaxing, comfy ride, has great detail retrieval and is open and airy, it is truly a lovely sounding headphone but it all comes down to preference. The Edition X images OK but it's not as precise, works totally find with Jazz, rock, blues, small type venues but give it a bigger venue then it starts to get a bit lost! The Edition X does present certain tracks with really decent height but it's kind of a side note as it's not really something I have to tell people about! It works for classical and music festival type records but doesn't really do much for studio produced tracks. Other than a few minor issues with personal comfort and clamp force, I highly rate the H1's tuning, it's music to my ears! The H1's are very clean and clear sounding with very, very little distortion where sometimes you can get a little resonance with the Edition X! Imaging for me, goes to the H1's, Oh boy...very precise with a wide sound-stage which has nice depth to it. Very dynamic and punchy too, is amazing for movies and other forms of media! In terms of speed, both are quite quick but I'd have to say the H1's sound and feel a little quicker, has great time and rhythm where the Edition X is comfortable running it's own race, casually showing off it's gorgeous details and presenting it's homework on time with very few mistakes! I can probably say with confidence by now, that these two planars are tuned very differently but do share some commonalities in terms of detail and texturing. Something of a distant cousins, same family tree, if you like! Where the Nighthawks are adopted child but gets along with all family members, and goes between the two with it's noble yet dark character ala Jon Snow! (Spoiler Alert: He's secretly a Targaryen!). I digress. I'm lucky to own both, the members in the this thread painted a very good picture of the H1's for me to make that decision to purchase them locally brand new for a very good price! $395 Aussie dollars is pretty damn great! I bought the Edition X's for twice that much a few years a go but i don't regret either purchase to be honest, sort of like finding your first gold nugget deep down in that mine, then later finding another even bigger nugget, deep down in that mine! Both experiences is more than worth it in the end but I will say to anyone looking for a planar headphone and want something other than the Audeze and Hifiman, give the H1's a try! Well worth it I reckon. Side note: I want to hear the new Sendy Aiva's one day soon because I keep reading impressions that remind me of the H1's! Also the new Takstars have definitely peaked my interest too! I hope this helps @Joong, any other questions, fire away my friend!