Additional data points can be found here in the original measurements thread. Direct links to Vtory's and @hands results for your convenience. https://www.superbestaudiofriends.org/index.php?threads/aurorus-audio-borealis-australis.7650/ I came on these late because I had the troops take a look at this first (that is screen it because I don't like wasting my time these days) to see if this was worthy of contention. Now I wish I got these direct and earlier because I am rather smitten by them. Do I feel the clouds have parts and I have been touched by the hand of God? No. However, these do two things particularly well: bass extension (for an open dynamic driver) and "speed". If there is anything that comes to mind, it's the STAX SR007. Yes, we can say that these are a dynamic driver version of the SR007 (with the both the limitations and strengths of dynamic drivers). I could be that I am just happy that there have been more dynamic driver designs lately. A few years ago, it seemed like "do we really need yet another planar" when it seemed that everything new that was being released was another ortho, usually with an letter appended on a prior model's name. BTW, here's a photo. I'll post more later on ergonomics. I didn't have any major issues, but I think people with bigger ears or ears that stick out could have fitment issues. Also, the seat belt suspension strap, is well... a seat belt. It doesn't conform to shape, flops and twists, so sometimes it is a minor bitch to have to adjust before putting on my head. I'd rather just have something I can put on immediately without having to fiddle with something. I usually start with frequency response measurements. Today I will do something different. I will start with burst decay, one aspect of "speed". Aurorus Borealis vs HD800 Burst Decay Nothing surprising here. No one considers the HD800 to be a "fast" headphone. The HD800 has many strengths, but "fast" is not one of them. I actually feel the HD600 (at least the latest iterations) faster than the HD800. And now that I think about it, it's probably on the slower end in terms of transient response for high-end headphones in 2020. Aurorus Borealis vs Elex Burst Decay Now this is interesting. The Focal headphones were known for their transient speed. Looks like the Borealis nudges it out at every frequency above except for 1500Hz. Aurorus Borealis vs SR1a Burst Decay Can it beat the SR1a? Nope. But holy cow. This is a fast headphone - at least in terms of decay.