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KRK KNS-8400 Studio Headphones

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KRK has always been focused solely on accurate monitoring. The KNS 8400 - with their ability to reveal exactly what you have on the tracks is an ideal choice for critical listening. Being able to disc... Read More

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    Pro Coverage Eligible Pro Coverage will repair or replace your gear quickly and get you back playing, gigging and recording as fast as possible-even accidental damage from drops or spills is covered.
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    Easy Returns If you're not happy with your purchase, we give you 30 days to return it for a full refund or exchange.
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KRK has always been focused solely on accurate monitoring. The KNS 8400 - with their ability to reveal exactly what you have on the tracks is an ideal choice for critical listening. Being able to discern the most subtle differences in pitch, timbre and tone helps you to get it right every mix, every take, every performance. Isolating memory foam in the ear cushions delivers improved low end response and because they gently conform to your unique head shape you'll be comfortable wearing them all day.

KRK headphones provide a precise listening experience that takes you from personal studio to commercial studio to on-the-go track evaluations - and they allow you to accurately enjoy your music with the consistent voicing philosophy and honest reproduction top producers, studio musicians, performers and engineers have come to trust.

The KNS 8400 offer an incredibly natural frequency response that gives you a reference standard unaffected by your location. Day or night. Studio or home. Without disturbing others. Without compromising your tracks.

  • Voiced to remain true to the character of KRK's class leading studio monitors, developed with 25 years of years of experience in studio sound.
  • The latest reference quality frequency response for closed-back, circum-aural dynamic headphones.
  • Newly developed headphone acoustical system bringing a new level of headphone performance for the first time.
  • Utilizing the latest in acoustic memory foam technology ensures class leading performance in both reproduction and isolation.
  • A new standard in headphone comfort, even over extended periods of use, designed to avoid feeling uncomfortable during long sessions. The special foam conforms to the ear to help ensure an improved fit.
  • Exceedingly accurate, natural and wide frequency response.
  • Large dynamic range with extremely consistent low-distortion detail and clarity.
  • Extended low frequency definition, ensures the bass component of your music is accurately reproduced, and is not lost.
  • Transparent reproduction of high-frequencies, resulting in highly accurate imaging.
  • High-efficiency Neodymium 40mm driver.
  • High durability 2.5m single-sided straight cable with oxygen-free copper wires.
  • Adjustable, foldable driver enclosures provide comfort and portability.
  • Replaceable cable, head, and ear cushions to ensure long product life.
  • Soft carrying case embossed with the KRK logo for travelling engineers, or storage when not in use.
  • System / Design: Dynamic
  • Operating System: Closed-back
  • Head Coupling: Circumaural (Isolating)
  • Voice Coil: Copper-clad aluminum wire
  • Driver Type: Low weight neodymium
  • Driver Diameter: 40mm
  • Sensitivity/Efficiency: 97 dB SPL @1mW
  • Frequency Response: 5Hz-23 kHz
  • Total Harmonic Distortion: < 0.1%
  • Rated Impedance: 36 ohms
  • Ambient Noise Isolation: up to 30 dBA
  • Long Term Maximum Power Handling 1000mW: (500mW per side as per IEC 60268-7)
  • Earcup Rotation: 90 degrees
  • Nominal Headband Pressure: 4 N (based on average head size)
  • Headband Type: Adjustable / Sprung steel skeleton
  • Ear Cushion type: Acoustic memory foam
  • Headpad Finish: Premium leatherette
  • Headphone Finish: Black impact resistant plastic
  • Volume Control: Detachable / Replaceable low profile inline high quality control
  • Cable: 2.5 m, (8.2 ft.), 99,99% OFC detachable
  • Connector: Gold-plated stereo 1/8" (3.5 mm)
  • Cable Connection: Strain relief managed
  • Adaptor: Screw-on 1/4" (6.3 mm)
  • Weight without Cable: 232 g (0.51 lbs)
  • Net / Shipping Weight
  • 850 g (1.87 lbs)
  • Dimensions: 245mm x 268mm x 94mm
  • 9.6" x 10.5" x 3.7"
Please read the warranty card that was included in the shipping carton of your monitor prior to shipping it back to KRK Systems, LLC. All products in need of repair can be returned to the dealer where it was purchased, or to KRK Systems, LLC. at the following address:

KRK Service Center
555 E. Easy Street.
Simi Valley, CA 93065
Tel: (818) 534.1575
Fax: (818) 534.1585
E-mail: service@krksys.com

Please call for a Return Authorization number before returning any product for repair.
For the safest possible return to KRK, please use the shipping carton and packaging that your monitor was originally shipped in.

KRK cannot be responsible for any damages incurred during the shipping process due to poor packing. Make sure to insure your shipment.

If your monitor is out of warranty and you would like a quotation prior to servicing your product, please include a note with your contact information on it and we will contact you with a service quote. Service will be performed once your method of payment has been established and approved.

Replacement carton and packaging can be purchased from KRK Systems, LLC. $18.00 per carton.

For replacement part quotes call (818) 534.1575.

Pro Coverage gives you added warranty protection for your new gear. Stepping in where the manufacturer's "normal wear and tear" coverage ends, our Pro Coverage program offers you upgraded coverage if your product ever fails Read More.

Pro Coverage includes
  • Accidental damage protection (new gear only)
  • Expedited repair
  • Free shipping (for returns or repairs)
  • 100% coverage for commercial use
  • Extended return period
  • Extended price protection
  • No lemon guarantee
  • Free transfer of coverage to a new owner
  • Repair costs covered for up to three years from date of purchase
  • Repair authorization-toll-free by phone or via the web
  • Customer Reviews


by PowerReviews

(based on 6 reviews)

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Reviewed by 6 customers

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(1 of 1 customers found this review helpful)


Dem speakers

By Mark Hill

from Salt Lake City Utah

These things are really just super high quality speakers you put on your ears. They are incredibly comfortable, and I have noticed things in songs that I had never heard before, and levels peaking that mixing engineers apparently missed. These are the most amazing pair of headphones I have ever had the pleasure to listen to.

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(1 of 1 customers found this review helpful)


fav headphones


from Kendall, FL

I own an AKG, Bose & a few Audio Technica's, but these are my favorite!! They go everywhere with me. I'm going to get the coiled cable for when I'm on a plane. I love how solidly built these 'phones are & how easy it is to change the pieces if needed. The sound is great just enough bottom without enhancing & you hear things in your mix that were colored over with other headphones. If you are deciding on the 6400's dont!! Saveup & get these for $50 more!! One major reason is the ear piece material difference between the two. Check it out for yourself. The 8400 is the way to go..

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(1 of 1 customers found this review helpful)


Simply Amazing

By Luke Biever

from North Las Vegas, NV

If you want headphones for listening purposes only, that have a low end for all the bassheads, these probably aren't for you. However, if you're an artist that is in the studio a lot and need to 'know' your headphones, or if you're an audio engineer, look no further. This pair is simply astounding. KRK didn't crank the bass way up and add any flair to the sound. What you hear is exactly what is being put through the headphones. I'm in the studio with my band recording bass and vocals for a post-hardcore/metalcore band, and I couldn't be happier. The Ear and Head pads are all replaceable and made from memory foam! I can keep them on for hours during long vocal sessions and not feel an ounce of uncomfort. The oxygen free cable has gold plated tips, and is removable. The In-Line volume adjustment is VERY nice while recording, due to the fact that it is nice not to have to stop a track to adjust the volume. A really nice innovation KRK put into these, is that the headband is made from a somewhat flexible material so that it will stay to form perfectly, but won't be broken in an easy way, if it was stepped on accidentally, or twisted the wrong way while traveling. All in all, very nice. Unless, again, that you need a severe low-end drop.

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(21 of 21 customers found this review helpful)


Accurate, truthful, pure bliss...

By Tyrone Beats

from Las Vegas, Nevada

Read every review on these if you want. You will read the same negative rhetoric about bass. These are not headphones for the average consumer who wants music dressed up and sugarcoated. If that is what your looking for head to Best Buy and grab some Beats by Dre. These headphones are for serious engineers, producers, dj's, and re-mixers who need and honest genuine pair of headphones in an environment that do not allow the use of studio monitors. I spent eight hours "Burning them in." I mixed down a few Rap tracks and a couple of Pop, and Techno. Played them back in the car, lo-fi monitors, and through my Android phone. Very impressed with the results. Keep in mind if you can't mix in the first place your finished product will still suck. "Just because you rock Jordan's don't mean you can dunk like Michael." Tyrone Beats.

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(12 of 12 customers found this review helpful)


Excellent Alternative To Monitor's.

By Adam

from Methuen MA

Im a producer and dj.I have been a producer for almost 15 years.Working with electronic and hiphop music.These headphones are a also alternative to studio monitors because they are just that for your ears.I cant really produce where i live now for various reasons especially not having a proper sound proofed room.These are the best investment i have made.But be cautioned they need time to burn in.When u first buy them there gonna seem to sound like cheap headphones.But after about 12 hours of consistent play they sound AWESOME.I played TCM'S high roller through them while i slept for about 8 hours and then ran a frequency sweep from 20 to 3000 for about 4 hours and now they are perfect.These headphones are really top notch and i would recommend them to anyone as a studio monitor alternative.

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(31 of 35 customers found this review helpful)


comfort and build quality

By noah montena

from syracuse, ny

The KNS8400 feel very good - sturdy and light, with the right amount of adjustability and headsqueeze - and offer a fair amount of isolation for a studio (I haven't used them enough in noisier environments, but they completely eliminate CPU whir and the sound of family upstairs). In addition to a nice fit, these cans feel pretty tough, and might last forever. For the bits that need changing because they get intimate with your sweaty head, like ear cups and arch pads, replacement parts are available, including various lengths of cord, which have a clever locking plug at the headphone end. The in-line volume control is, likewise, removable and replaceable Now, for the audio quality: I believe the KNS8400 are best suited to mastering and monitoring. They have excellent clarity and imaging, but a weak low end (even though the design notes in the manual indicate an "exrended low frequency definition"), so you may be disappointed if you are using them for listening alone. Turning up the bass on your source device does very little. This may be due to the 40mm drivers, but compared with Sony's MDR-V600 (also 40mm) they were still weak. Bigger, and, admittedly, more expensive, headphones like the BD DT770 or the Sony MDR-7509HD give a much richer listen. That being said, I am still very pleased with these KRKs because skull-fogging bass is not what I need for mixing and mastering, detail and flatness and comfort are.

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