You should try removing the inner foam ring on the K872, I find that mod to make them sound incredible.I only just decided to stop just lurking and reading reviews here and actually start participating a bit on head-fi and this thread is a big part of why. Reading through some of the positive K812 owner opinions in here has made me feel like I found my people lol! I have been active on the headphones sudreddit for a while and lurking here and there long before that and I think I might be the only K812 Pro owner on that sub! It's nice to find a place where they are properly appreciated.
I have a decent collection of headphones and gear and have tried or owned in the past many, many more headphones. The K812s are one of my favorite AKGs of all time and I have owned dozens of contemporary and vintage AKG sets from the 200, 300, 400, 500, 600, 700, and 800 series as well as the K1000s and as far as everyday listening the K812 Pros are up there with the best and most versatile of them. Feed them some hi-res tracks from a good DAC with enough power behind it (for me most often my Burson Timekeeper 3i or ifi Gryphon) and they will give you every bit of detail that can be wrung out of a track. The soundstage is both deep and wide, making for an absolutely huge presentation. The bass reaches deep without being overly enphasized and is well controlled and lush. The mids are absolutely packed with detail and combined with a treble section that adds plenty of flourish.
Since I bought the K812 Pros I have used them more than any other headphone I own. I just purchased the DCA Stealths yesterday so that may be changing because those things are ridiculous, but rest assured that the K812s will always see plenty of head time. They are truly an elite headphone that can easily hold their own in elite company.
Anyways, just wanted to say hello and thanks for creating a place where I can be amongst fellow K812 Pro owners and enthusiasts. It's nice to be amongst my people!
Edit: Just wanted to add that I also own the K872s (essentially the closed back version of the K812s) and they are spectacular as well. Much of my listening is done in environments where the added isolation of a closed back can be helpful and the K812s impressed me so much that the K872s were practically a no brainer.
What are your current thoughts on the K812. I´m considering a new open-back, I saw the new Heddphones 2 as well, at $2000 they are still reasonable based on all the cables and accessories it comes with. I also saw the new Austrian Audio The composer, but at $2800 and basically no accesories I find it too expensive.