KRK KNS 8400 Studio Monitoring Headphones

Closed-back Circumaural Headphones with Memory Foam Earpads, Detachable Cable, and In-line Volume Control
KRK KNS 8400 Studio Monitoring Headphones image 1
KRK KNS 8400 Studio Monitoring Headphones image 1
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KRK KNS 8400 Studio Monitoring Headphones
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Accuracy and Reliability - and a New Standard in Comfort

You demand a lot from pro headphones, and the KRK KNS 8400 closed-back monitor headphones deliver. Voiced to remain true to the character of KRK's class-leading studio monitors, the 8400s are designed to be a true reference monitor, allowing you to record and mix the same way you would using speakers. Exceedingly accurate, the 8400s have a natural, wide frequency response with a silky, articulate high end, as well as extended low-frequency definition that ensures that the bass component of your music is accurately reproduced. And the robust dynamic range exhibited by the KRK KNS 8400s serve up consistent low-distortion detail and clarity.

Traditionally, having to switch from speakers to headphones has represented a disconnect of sorts in the recording process. You often find that those comfortable, ruggedly built headphones you love bear little sonic resemblance to your trusted monitor speakers. Drawing upon their 20-plus years of experience in studio sound, KRK has solved this dilemma with their KNS series headphones. Happily, going to headphones is no longer a jarring experience!

The KRK KNS 8400s usher in a new standard in headphone comfort - even over extended periods of use. The 8400's circumaural design employs high-tech memory foam ear cushions, allowing them to conform to your ear to help ensure a comfortable fit during marathon sessions. KRK has thoughtfully spec'd these 'phones with replaceable parts, including a detachable high-durability oxygen-free copper cable with an in-line volume control. Delivering accuracy, comfort, and reliability, these puppies are designed from the ground up for pro monitoring so you can trust your headphones as never before.

KRK KNS 8400 Closed-back Monitor Headphones Features at a Glance:
  • Voiced to remain true to the character of KRK's class-leading studio monitors
  • Adjustable, foldable driver enclosures provide comfort and portability
  • Replaceable cable, head, and ear cushions ensure long product life
  • Closed-back, circumaural, dynamic design
  • Detachable 8.2' straight oxygen-free copper cable with gold-plated 1/8" stereo connector and 1/4" screw-on adapter
  • Copper-clad aluminum wire voice coil
  • 1.57" low-weight neodymium driver
  • Acoustic memory foam ear cushions
  • Premium leatherette headpad finish
  • 5Hz-23kHz frequency response
  • Up to 30dBA of ambient noise isolation
  • Replaceable in-line volume control
  • Antimicrobial/antibacterial cleaning cloth and soft carrying case included
The KRK KNS 8400 closed-back headphones: monitor with confidence - sans headache!

Additional Media

Headphones Buying Guide
KNS Series Studio Monitoring Headphones - Closed User Manual
Live Sound Monitor Buying Guide
Studio Monitor Buying Guide

Tech Specs

Open/Closed Closed
Fit Style Circumaural (Around the Ear)
Driver Size 40mm
Frequency Response 5Hz-23kHz
Impedance 36 ohms
Cable Type Straight
Replaceable Cable Yes
Cable Length 8.2'
Plug Size 1/8"
Weight 0.51 lbs.
Manufacturer Part Number KNS8400

Customer Reviews

Based on 27 reviews
Write your review

Surprisingly good for closed-back

I own a pair of Sennheiser HD 650s. These are open back cans that articulate as well as anything under $1000. I have owned the KRK headphones for even longer. When I first listened to the Sennheisers, they sounded awfully familiar... like my 8400s! I did a bunch of A/B tests on different genres of music, and I was forced to admit that the difference between the KNS 8400 and the HD 650 is pretty subtle - the Sennheisers sound slightly more smooth in the midrange frequencies, but I have to switch headphones very quickly to discern it. I use the amp in my id22 interface, which is no slouch. I'm beginning to wonder if there is any point to my keeping the Sennheiser headphones, other than they are more comfortable - the headband extends over my big head further. Practically, the KRK headphones have a single-sided detachable cable and an inline volume control going for them. Closed back is better for tracking and privacy. And they are less than 1/3 the price. The Sennheisers may do better with a high end amp and DAC, but for my humble little project studio, the KRKs are nearly identical in sound. You can't go wrong with the KNS 8400s.
Music background: Part-time professional engineer, musician, full-time project studio owner.

Honest Review of KRK 8400

The KRK 8400 Studio Monitor Headset is absolutely the flattest Headset I have ever experienced. They Eerily have no artifacts that let you know you even have headphones on! But... with the rather extreme low frequency response of this KRK Headset of 5 Hz (approx. 20 Hz is as low as the human ear can hear), you will find that using them "out of the box", you must make the bass in your mix nearly inaudible. However... spend a small amount of time and run them through an EQ or Mixer; and in short order, you can make your final mix or master sound in the Headphones, EXACTLY like the final product will. Just like tuning a Speaker Monitor to the room, you need to do some small adjusting which should be expected. . But the final result will be astounding! I can't express in words the quality & transparency of sound you can achieve with this set.
Music background: Recording Engineer, Live Sound, 18+ years Professional Vocals, Guitar, and Keys


Smooth! No hyped bass. For me they are very enjoyable to listen to. Better than the last set of cans I purchased and those were twice the cost!
Music background: Sound engineer, recording engineer, musician, music lover

Finally some headphones that goes well with my KRK setup.

Excellent ceiling overall. Doesn't seem to feel compressed in overall sound dynamic range. Has the KRK feel. Everything is very upfront for you. I can now hear the mixes correctly the way you want it . Bass is tight and not overbearing. Sounds are very tight and crisp. But no hifi...very flat. Construction is top notch and much better made than my old Sony 7506's.
Music background: Filmmaker/Post-Production Sound Designer

Best headphones ever

these are the best headphones i've ever had. awesome sound, soooo comfy, sturdy as hell. love em. i'll never use any other brand. thank you KRK!
Music background: singer/songwriter/producer
See also: Head Phones, KRK, KRK Headphones, KRK Headphones