KRK Systems KNS 8400 by j.wal
For pretext, I'm only an amateur hip hop producer. So take what you will from this review.
I came to the 8400's via a broken pair of Sony 7506's. I liked my Sony's a lot, was always amazed at their detail and accuracy (at the time), but didn't want to go through the cost and trouble of repairing them. Enter KRK. At first my 8400's sounded slightly underwhelming with sub-par bass response. I burned them in for 50+ hours and they sound significantly better. The bass is still not powerful, but it IS there and it is accurate. If you want something a little more colored (and bassy) but still monitoring-capable, Audio Technica or Beyerdynamic may have what you're looking for, from what I've read. My impression of the KRKs is that they are no-frill, professional monitors at an affordable cost (not paying for any gimmicks). Along with the accurate bass, all other levels (mids, highs) are very well and evenly represented too. One thing I've noticed with KRK's is less fatiguing mids/highs at higher volumes, something the 7506's plagued me with at times. The KRK's are more balanced. The KRK's are also slightly more detailed than my 7506's as well, particularly in that I'm noticing more flaws in recordings than I did before.
Finally, comfort. This is the one category I have to give to the 7506's, I could wear those headphones for hours on end and forget I was wearing them. However, the 8400's are very close. My ONLY complaint is the headband, I wish the padding was more evenly distributed (to distribute the weight of the headphones) rather than designed to where it creates two distinct pressure points. It does cause very mild discomfort to where I find myself adjusting the position of the headband occasionally during longer periods of use. With that said, though, I consider comfort to be of profound importance to me and still decided the 8400's are desirable enough to keep and enjoy. The ear pads and clamping force of the headphones are very nice and relaxed, very comfortable. I have normal ears and a slightly larger head and have no complaints in either of those areas, the ear pads encompass my ears completely and isolate relatively well.
I would give a 5/5 on sound relative to price. 4/5 on comfort (but 5/5 if the headband padding was designed differently). Finally, if you don't like straight cords like the cheap-ish quality one that comes with the 8400's, KRK's official website has a link to purchase an optional coiled cord for $15-$20. Worth it in my opinion, but would've much rathered the headphones came with one in the box instead. Good luck!