My living situation will be changing (again) within the month, so I decided to look into the current closed-back offerings since isolation will (again) be a requirement for me. I started with the headphone I had before, the Edition 8, and branched out from there. The Signature Pro was just gaining a user base when I made the transition back to open 'phones and it looks like it has taken top billing for many Ed8 fans. However, with my current "paring down" kick coupled with my newfound appreciation for sufficiency that replaced a "need" for perfection, I wanted to see what cheaper options were out there. I first looked to Beyerdynamic as I've always loved the comfort of their mid-high tier offerings and there were some new products on the market that I had barely read about. The prime candidate seemed to be the T70, but if impressions are to be believed it has some attributes that I find undesirable (bright, bass-light, relatively small soundstage) so that's out. Continuing my search showed little else in the way of new contenders as the old mainstays are perpetually touted and recommended. (not that there's anything wrong with that... the HD600 is nearly 20 years old and is still my favorite all around open back) This meant that tight, revealing, fast, spacious, and headphones neutral enough for absolute versatility were still in short supply.
Then along came some reading material for the K550. I'll admit that I had been following this headphone since its announcement but stopped when impressions started rolling in. I was reeled in by the aesthetic beauty of it and wondered, just as with the styling, if it would be somewhat of a sonic departure for AKG. Early impressions, however, dubbed it a closed K701: sterile, bass-light, and treble-focused. I understand the appeal of the K701 but admit that it's a headphone that I dislike. Still, after reading Tyll's writeup over at Inner Fidelity I came over to this thread to read mixed reviews. It all left me intrigued enough to at least see what kind of pricing I was able to find. As it happens, I had access to it cheaply... and locally. I picked one up today, let it cycle through some various content while I prepared/ate dinner, and then put in some head time with it.
I'm not going to go into great length here as I really need to let it run for at least a couple days before I truly put it through its paces, but on initial listen I'm firmly in the camp that LOVES this headphone! Soundstaging is astounding for a sealed headphone, and not just because of its well above average size. One thing that I really disliked about the K701 was the lack of cohesion in its presentation. Individual instruments could sometimes sound too far away from side to side and there was often this feeling of empty space directly in front of me. With the K550, it's not as spacious but still reminiscently large and without the abnormalities. In addition, I do NOT think that this headphone is bright nor is it treble-centric or sibilant. I would confidently describe it as largely neutral, flat, and uncolored. In terms of the hotly contested bass debate, I find it to be very well done, never light, and more than satisfying when it's called upon. This is coming from someone that has owned a Darth Beyer, V4 Terminator, PRO-900, and a current owner of an HFI-580. It's not a headphone that "injects" bass where it's not present or pushes it forward of the rest of the spectrum when it's summoned. It's, by my ears' account, spot-on. Bass-heavy content sounds bassy and tickles my ear canals, not my pinna. And yes, a good seal is absolutely required for proper bass performance. (as well as everything else from my quick muck around with the physical positioning of the cups) If you're not hearing the lows with these, are not a basshead, and are absolutely certain that your source/content is not the issue, then I say man up and bend the headband a bit. I coaxed it in a bit on each side for a tighter fit and it certainly made the response more even to my ears.
Does it lack the body of, say, my HD600? Yes, and it sounds predictably dryer. I love my HD600 (especially after getting the Cardas cable) for its involvingly lifelike sense of weight while still maintaining a balanced frequency response and avoiding sounding slow. (the problem that I have with Denons, for example) However, I do find the K550 to be involving (possibly equally so) but for a different reason: it's an extremely high resolution headphone for any price range that expertly/effortlessly conveys every detail. Additionally, it does so without any noticeable accentuation of them. (despite the treble spike present in the graphs... I can't say I have yet to definitively detect it) But make no mistake, this is an analytical headphone and will make the recording quality and mixing/production choices a large factor in your appreciation of specific content. For me this attribute is a huge plus, bit it could absolutely be a negative for the large part of this forum that revels in "smooth" presentations. That isn't to say that they're abnormally rigid, they're not, but they're true to the content for better or worse. Interestingly, one of the peaks of my excitement came when I took off the 1/4" and simply ran them out of my MacBook's headphone port. I was readily able to hear clear differences between iTunes, Amarra Full, and Amarra Hifi. (thanks to Computer Audiophile for the freebie!) That's something I've only minimally experienced with the Edition 8 and have never been able to do with any other headphone. As a package and limiting to what I've owned, only the Ed8 encompassed both the lifelike presentation of the HD600 and the revealing nature of the K550, but it took some component rolling that ultimately turned into $1000 of complimentary equipment for me to find my ideal performance and even then there was some of the aforementioned rigidity that could make them relentless with the worst recordings.
This was more long winded than I intended and assuredly a bit scatterbrained, but the K550 deserves praise. It's a great headphone for the right audience that can be had for a hell of a good price. It's certainly not for everyone but its technicalities are impossible to ignore. Even on this cursory listen, I'd implore anyone with an interest in these headphones to make a refundable purchase and give them a proper audition. I'm looking forward to seeing how the sound evolves as I get some more hours of them and try some different components.