I recently was between KRK KNS 6400 or 8400 and Shure SRH440. I started from knowing basically nothing about headphone specs and spent many hours learning and to decide.
I wanted a very crisp accurate neutral flat sound. Because I want to hear my synthesizers very clear and other hardware musical instruments. Possibly the main factor for me wanting such a neutral sound was for FPS gaming, I want to hear footsteps really well and assume that neutral phones would do that, but I don't really know, maybe the sound is programmed to come through actually better with some bass (or treble on the opposite side of the spectrum and I'm wrong).
I asked here and someone said it's not as accurate to just take a "bass-heavy" pair of phones and lower your EQ bass to make them neutral.
I omitted the Shures and then decided 6400 or 8400 KRKs. Didn't like the exposed thin wires of the shures, the headband is basically just hard plastic, didn't like the coiled cable although you can sell that right away on ebay and get the straight one. Forgot what else made me omit the Shures but I did. If anyone's deciding between shure 440 and KNS 6400 or 8400, I think I compiled the general consensus between these in a previous post of mine a few days ago.
I kind of jumped the gun on 6400 or 8400 but I think I'll be happy. I bought the 8400 for ~$99 shipped new on Jet.com with a %10 coupon. 6400s are the same price online currently give or take just a few dollars. After I bought them, I heard back from KRK about 6400 vs 8400. I basically asked which were flatter and more neutral. They replied
For mixing purposes, the low end is more accurately represented on the 8400. However, personal preference is still the major determining factor.
If you love hearing accurate low end that translates well over all audio systems, the 8400’s would be for you.
Thanks again for contacting Gibson Pro Audio Customer Service, and best regards always.
This is exactly what people on forums say about the bass, and also that 8400 just sounds "better" than 6400. I just hope the 8400 can pronounce footsteps in FPS games as good if not better than the 6400. I think regardless of footsteps I'll probably be happier with the 8400 for synths and general audio. They are still a Neutral / Flat (almost apparently) Headphone so I should be good.
I love bass don't get me wrong, I just don't like a rattle that drowns out the rest of the sound, or anything close to that "rattle". I hope these phones and similar other ones don't even rattle like a $5 pair of closed back headphones.
the 8400 do have memory foam pads but the 6400 don't. I just hope they're not the same memory foam that emits toxins like mattresses but I think that might only be from the mandatory fire proofing all (or most) mattresses must have, and hopefully consumer electronics memory foam is not treated with fire retardants. Replacement pads are like $30 from what I found, and the shures have cheap Chinese ones on ebay that start at $4 shipped but I think you can ask a forum if anyone knows a different pad that would fit 6400 / 8400 if you ever need to replace them (my sennheizer pads are fine after like 6+ years). Paying 1/3 the cost of the entire headphone just for pads is outrageous.
I think it might be over-analyzing to get a pair of 6400 and try and see if footsteps are clearer on them vs 8400 and then sell one for a ~$20 loss. I would have to record a snipped of only hearing footsteps in the game and then loop it and hope that the audio quality is still the same as in the actual game and then physically change between left ear of 6400 and left ear of 8400 (because sounds processed though your left ear are actually processed "better", so I wouldn't be able to just put both cans on with one ear on each ear and pan between the two. I would have to do this all with my eyes closed after mixing up both headphones so I didn't know which was which when comparing.
"the low end is more accurately represented" Could actually mean that they are both equally neutral but that the 6400 just doesn't pronounce bass as well as the 8400, and that it's a win win for me.
Having said that, I am curious to compare these two, and also for stuff besides just footsteps. I probably wouldn't keep both because then that'd put me in the $200 range for headphones I can just get one pair that is probably better than the KNS I decide on but for the ~$20 loss and hassle of testing and reselling them, I kind of want to see for myself.
But really, the slight if any increase in hearing footsteps in a game with 6400 vs 8400 is probably less than %1 of the overall game and how well you do, and having the extra bass of the 8400 might actually make you play "better" due to other sounds, i.e footsteps might actually come though clearer through the lower end because it's probably not likely that footsteps were programmed to sound like a high treble "tick" / "fizz" sound instead of coming though on the mids or lows mainly.
As you can see, deciding on headphones has basically made me delirious about it, but I hope I helped if anyone is deciding between these two cans.