KRK Headphones KNS6400 User Manual

KNS SERIES  
PROFESSIONAL HEADPHONES  
KNS6400  
KNS8400  
USER MANUAL  
 
SAFETY  
The possible results of incorrect use are marked by one of the two symbols “WARNING” and  
“CAUTION”, depending on the imminence of the danger and the severity of the damage.  
WARNING: Ignoring these warnings may cause severe injury or death as a result of incorrect  
operation.  
CAUTION: Ignoring these cautions may cause moderate injury or damage as a result of  
incorrect operation.  
NOTE: This advice ensures you continue to get the best long term performance from your  
headphones.  
WARNING: If water or other foreign objects enter the inside of the device, fire or electric  
shock may result.  
WARNING: Do not attempt to disassemble or modify this product. Doing so could result in  
personal injury and / or product failure.  
WARNING: Do not use mobile phone adaptors to connect headphones to the jack sockets  
on airplane seats. This can cause overheating possibly resulting in personal injury such as  
burns, et  
WARNING: Do not use headphones when driving or operating any kind of mechanized  
transport. Safety of yourself and pedestrians is put at risk as you are prevented from hearing  
external warning noises.  
CAUTION: The character of external warning sounds can be affected during headphone  
use. Ensure you can still recognize these sounds before use.  
CAUTION: Do not subject headphones to extreme force such as dropping, impact from  
another object, or impact from poorly packed luggage.  
CAUTION: Do not pull, or put excessive strain on the headphone cable, this may cause  
damage and /or failure.  
CAUTION: Keep the product dry and avoid exposure to extreme temperatures and humidity.  
CAUTION: Ensure the headphone plug is securly being held when disconnecting the cable;  
never pull on the cable as this could cause damage to the connections.  
NOTE: It is common for the headphone ear cushions to gradually deteriorate over time; this  
is commonly known as “wear and tear”.  
 
3
SAFETY LISTENING GUIDANCE  
WARNING: LISTENING TO AUDIO AT EXCESSIVE VOLUMES CAN  
CAUSE PERMANENT HEARING DAMAGE. USE AS LOW A VOLUME  
AS POSSIBLE.  
Over exposure to excessive sound levels can damage your ears resulting  
in permanent noise-induced hearing loss (NIHL). Please use the following  
guidelines established by the Occupational Safety Health Administration  
(OSHA) on maximum time exposure to sound pressure levels before  
hearing damage occurs.  
RISKS/ACTIONS  
SPL(dB)  
RELATIVE LEVEL  
190  
180  
170  
160  
150  
140  
130  
120  
110  
100  
90  
THEORETICAL LIMIT IN AIR  
SPACE SHUTTLE LAUNCH  
DANGER  
CANON FIRING  
RISK OF WINDOWS BREAKING  
JET ENGINE  
EMERGENCY SIREN  
LOUD CONCERT ROCK/ELECTRONIC  
137.5 dB = PAIN THRESHOLD (AVERAGE)  
CYMBAL STRIKES / HIGH HATS  
140 dB PEAK EXPOSURE LIMIT  
137dB PEAK UPPER EXPOSURE ACTION  
135 dB PEAK LOWER EXPOSURE ACTION  
(RISK OF PERMANENT HEARING DAMAGE - PEAK)  
FULL SYMPHONY ORCHESTRA  
RISK  
JACK HAMMER AT 1m  
BUSY ROAD TRAFFIC  
87dB EXPOSURE LIMIT  
85 dB UPPER EXPOSURE ACTION  
80 dB LOWER EXPOSURE ACTION  
80  
PERSONAL AUDIO SYSTEMS  
HOME THEATRE / TV  
NORMAL OFFICE  
70  
(RISK OF PERMANENT HEARING DAMAGE - CONTINUOUS)  
60  
50  
QUIET OFFICE  
LISTENING DURATION GUIDANCE  
QUIET RESIDENTIAL  
RECORDING STUDIO  
LEAVES RUSTLING  
CALM BREATHING  
40  
SAFE  
120dB  
115dB  
110dB  
105dB  
100dB  
95dB  
Avoid or take reduction precautions  
15 minutes  
30 minutes  
1 hour  
30  
20  
2 hours  
4 hours  
8 hours (level dependant)  
90dB  
10  
0
AUDITORY THRESHOLD  
 
4
WARRANTY  
Please refer to the warranty card shipped with your product. Please also  
fill in the attached registration card if you’d like us to keep you up to date  
on KRK developments.  
DISPOSAL  
This symbol on the product, in the instructions or on the packaging means  
that your electrical and electronic equipment should be disposed at the  
end of its life separately from your household waste. There are separate  
collection systems for recycling in the EU. For more information, please  
contact the local authority or your retailer where you purchased the  
product.  
This product’s packaging materials are recyclable and can be reused.  
We advise keeping the packaging for shipping, but if you choose to  
dispose of it, please do so in accordance with your local authorities  
regulations.  
CARE AND MAINTENANCE  
KNS Series headphones do not require a service schedule. Please follow  
the cautions below when cleaning your product.  
CAUTION: Only use the provided anti-microbial/bacterial cloth to clean  
your headphones; this will help maintain good hygiene.  
CAUTION: Never use solvents or thinners to clean the headphones, this  
can damage the headphones.  
CAUTION: If the headphones become excessively dirty wipe down with a  
slightly damp non-abrasive cloth, then dry immediately.  
CAUTION: While cleaning your headphones, please avoid getting liquid  
and/or foreign objects in the driver ports, volume control and connections.  
 
5
WELCOME  
Congratulations on your choice of headphones, and welcome to the ever  
growing family of KRK owners.  
KRK’s KNS Series of professional studio headphones are designed to  
forever change the way you handle your most demanding audio jobs.  
The KNS headphones feature key design elements that continue to  
make the KRK sound a “studio standard”. The series was created using  
stringent design philosophies applied to all of our products.  
The result is a studio reference set of headphones that you can trust,  
delivering defined low-end, articulate midrange, and precise, natural  
highs.  
Whether you are making critical mixing decisions or need to capture the  
subtle nuances of a unique sound, you’ll quickly discover that the KNS  
Series deliver a new level of audio performance.  
This manual is intended to inform you of the many features of your new  
KNS headphones. We encourage you to take a few minutes to familiarize  
yourself with this manual.  
Thank you once again for choosing KRK!  
USAGE GUIDANCE  
The KNS series headphones are designed for critical listening and  
monitoring in the following situations:  
Engineer/Artist Recording Studio: Mixing / Monitoring / Recording  
Engineer/Artist Broadcast Studio: Mixing / Monitoring / Recording  
Musician/Artist Studio: Monitoring / Composition / Recording  
Musician/Artist Live/Stage, Monitoring  
Technician  
General  
Monitoring at any location  
Personal music listening  
 
6
DESIGN PHILOSOPHY  
Any studio monitor is a tool used to aurally “measure” the changes in  
an audio path. Ask any seasoned recording professional what they think  
makes a great monitor and you’ll get the same consistent answers:  
“Accuracy, transparency, flat response, and the truth.”  
From years of listening to feedback from some of the top engineers and  
producers, the KRK design team has an in-depth understanding how a  
properly tuned monitor is a critically important recording tool.  
The KNS series headphones are designed, engineered and tuned to  
the same exacting standards and have been developed to be as flat as  
possible so that what you hear represents the true nature of the audio  
material without coloration or enhancement.  
Using professional monitors in an acoustically correct studio is ideal for  
recording, mixing and mastering – but there are times when portability,  
sound isolation and freedom from your environment’s acoustic limitations  
are the priority.  
The KNS Series from KRK is becoming the headphone of choice for mix  
analysis. After all, hearing what is wrong with your mix is just as important  
as hearing what is right! At KRK, our passion is monitoring and accurately  
reproducing a natural, honest sound everywhere in the control room, the  
KNS series are no exception.  
Whether you are mixing tracks, or recording your next song, the KNS  
series gives you the famous KRK sound independent of your monitors.  
This closed-back around-the-ear design brings you closer to your music,  
and the highly isolated memory foam ear cushions provide incredible  
isolation and long term comfort.  
Having “One Voice” that consistently gives you an accurate reproduction  
of your music or mix will help you to achieve just what the artist intended.  
Especially when the artist is you!  
 
7
FEATURES  
• 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 especially during long  
periods of use. 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.  
• Designed to last, made from durable, impact resistant materials  
throughout the system.  
• Designed in California, made in Taiwan.  
 
8
FEATURES  
• High-efficiency Neodynium 40mm driver  
• High durability 2.5m single-sided straight cable with oxygen-free  
copper wires  
• KNS-8400 comes with a replaceable in-line volume control with a sleek  
profile which is designed not to catch on clothing or instruments  
during performance. The volume control also uses a high quality  
long-life fader and comes in a sturdy enclosure.  
• Adjustable, foldable driver enclosures provide comfort and portability  
• Replacable 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.  
• ¼” jack plug can be unscrewed to reveal a 1/8” plug for laptops and  
portable media players.  
• Anti microbial/bacterial cleaning cloth  
• User instructions and warranty  
 
9
SPECIFICATIONS  
System / Design  
Dynamic  
Nominal Headband Pressure  
4 N (based on average head size)  
Operating System  
Closed-back  
Headband Type  
Adjustable / Sprung steel skeleton  
Head Coupling  
Circumaural (Isolating)  
Ear Cushion type  
Acoustic cellular foam [KNS-6400]  
Acoustic memory foam [KNS-8400]  
Voice Coil  
Copper-clad aluminum wire  
Headpad Finish  
Leatherette [KNS-6400]  
Premium leatherette [KNS-8400]  
Driver Type  
Low weight neodymium  
Headphone Finish  
Black impact resistant plastic  
Driver Diameter  
40mm  
Cable  
Sensitivity/Efficiency  
[KNS-6400] 95dB SPL @1mW  
[KNS-8400] 97 dB SPL @1mW  
2.5 m, (8.2 ft.), 99,99% OFC detachable  
Connector  
Gold-plated stereo 1/8” (3.5 mm)  
Frequency Response  
[KNS-6400] 10Hz-22 kHz  
[KNS-8400] 5Hz-23 kHz  
Cable Connection  
Strain relief managed  
Total Harmonic Distortion  
< 0.1%  
Adaptor  
Screw-on 1/4” (6.3 mm)  
Rated Impedance  
36 ohms  
Weight without Cable  
[KNS-6400] 202 g (0.44lbs)  
[KNS-8400] 232 g (0.51 lbs)  
Ambient Noise Isolation  
[KNS-6400] up to 26 dBA  
[KNS-8400] up to 30 dBA  
Net / Shipping Weight  
[KNS-6400] 820 g (1.8 lbs)  
[KNS-8400] 850 g (1.87 lbs)  
Long Term Maximum Power Handling  
1000mW  
(500mW per side as per IEC 60268-7)  
Dimensions  
245mm x 268mm x 94mm  
9.6” x 10.5” x 3.7”  
Earcup Rotation  
90 degrees  
* For improvement purposes, specifications and design are subject to change without notice.  
 
10  
ACCESSORIES AND PART NUMBERS  
Part Numbers:  
KNS-6400  
KNS 6400 HEADPHONE  
KNS-8400  
KNS 8400 HEADPHONE  
CUSK00001  
CUSK00002  
CUSK00003  
CUSK00004  
CBLK00027  
CBLK00028  
CBLK00029  
CBLK00030  
CBLK00031  
CBLK00032  
BAGK00009  
CONK00007  
CUSHION EAR KNS6400  
CUSHION HEAD KNS6400  
CUSHION EAR KNS8400  
CUSHION HEAD KNS8400  
CABLE COILED 2.5 M KNS  
CABLE STRAIGHT 2.5 M KNS  
CABLE STRAIGHT 3M EXTENSION KNS  
CABLE STRAIGHT 10M EXTENSION KNS  
VOLUME CONTROL KNS  
CABLE STRAIGHT 1.5 M KNS  
BAG PROTECTIVE KNS  
CONNECTOR 1/8” to 1/4” ADAPTER KNS  
Replacement parts and accessories:  
Accessories or replacement parts can be ordered through KRK  
Customer Service / Sales. Please see the contact information on the final page of  
this document for contacts in your territory.  
 
11  
WEARING/ADJUSTING GUIDE  
Place the headphones on the head guided by the markings which identify  
the left and right driver enclosures. Adjust the headband as shown  
below so it rests gently on top of your head and the ear cushions fit  
comfortably around your ears. The driver enclosure is connected using  
an adjustable yoke which will naturally turn to ensure proper fitting, and  
optimum performance. There should not be excessive pressure when the  
headband is adjusted correctly.  
 
12  
CONNECTING  
The KRK KNS series headphones connect with almost any professional  
and consumer audio device such as Professional Live, Recording and  
Broadcast Mixers, Audio Interfaces, Headphone Amplifiers, personal  
computers, personal media players, CD/DVD/Blu-Ray players.  
Most professional audio equipment utilizes a ¼” socket for connection  
of headphones. In this instance, the headphones are ready to use as  
supplied with the ¼ screw-in adapter fitted.  
Personal computers, media players and some consumer devices utilize  
an 1/8” socket for connection of headphones. In this instance, please  
un-screw the ¼ adapter from the tip of the cable to reveal the 1/8”  
connection. Please remember to store the adaptor safely so that it can  
be used when necessary.  
Insert the headphone plug securely into the audio jack of the selected  
audio device.  
NOTE: KRK recommends turning off all sound enhancements / special  
effects present in some consumer devices before use. This processing  
can prevent you from getting the best performance from your headphones.  
WARNING: The KNS headphones when driven by high-powered  
headphone amplifiers have the capability to reproduce audio at levels  
which can damage hearing over time. Please ensure good care when  
connecting, setting up, and using your headphones. Keep in mind that  
your ears are the most important tool of your trade, please treat them  
accordingly.  
WARNING: When plugging your headphones into a headphone amplifier,  
please make sure that the level control on the amplifier / mixer / audio  
interface is set to minimum and slowly raised to the required operating  
level.  
 
13  
CABLE CONNECTION GUIDE  
1. Insert 1/8” connector into socket (from cable or headphone volume  
control)  
2. When properly inserted you will feel it “click” into place.  
3. Now turn the plug clockwise in the socket to secure the cable  
VOLUME CONTROL CONNECTION GUIDE  
 
14  
CUSHION REMOVAL/FITTING GUIDE  
REPLACING THE HEAD CUSHION  
The head cushion is held in place by a mounting flange which snaps  
under small tabs located around the inside rim of the headband. If a head  
cushion becomes loose, simply push the mounting flange of the earcup  
cushion back into the earcup. Using your finger or thumb, press around  
the edge of the mounting flange, making sure it “snaps” in place all the  
way around the head cushion.  
REPLACING THE EAR CUSHIONS  
The ear cushions are held in place by a mounting flange which snaps  
under small tabs located around the inside rim of the driver enclosure. If  
an ear cushion becomes loose, simply push the mounting flange of the  
ear cushion back into the driver enclosure. Using your finger or thumb,  
press around the edge of the mounting flange, making sure it snaps in  
place all the way around the ear cushion.  
 
15  
STORAGE AND PROTECTION  
To ensure your headphones are well protected during travel there is a  
specially designed soft bag included in the package.  
Please ensure the headphones are fitted into the bag as shown below  
and that it is tied securely to prevent anything from entering the bag which  
could cause damage.  
 
16  
TROUBLESHOOTING  
Problem  
No audio  
What to do  
Ensure your device is plugged in correctly  
Ensure your device is connected to the correct socket  
Ensure the source is sending audio and the output level is good.  
Excessive bass  
Distorted bass  
Turn off any bass boost features on the source device  
Make sure that the driver enclosure ports are not blocked, if they  
become blocked, please clean as directed.  
Distorted sound Ensure that the driver enclosure ports are not blocked, if they become  
blocked, please clean as directed  
If any problem persists, contact Customer Service. See the phone number for your area  
included in this guide.  
 
17  
CONTACT DETAILS  
POSTAL:  
KRK Systems, LLC.  
772 S. Military Trail  
Deerfield Beach, FL 33442  
WEB:  
SALES  
EMAIL:  
TELEPHONE:  
FAX:  
+1 954-949-9600, option 1  
+1 954-949-9590  
CUSTOMER SUPPORT  
EMAIL:  
TELEPHONE:  
FAX:  
+1 954-949-9600, option 3  
+1 954-949-9590  
REPAIRS/RETURNS  
EMAIL:  
TELEPHONE:  
FAX:  
+1 954-949-9600, option 2  
+1 954-949-9590  
MARKETING COMMUNICATIONS:  
HUMAN RESOURCES:  
hr-staffi[email protected]  
*Please provide your phone number with your contact e-mail message.  
 
18  
NOTES  
 
19  
LITK00063 - REV B - KNS USER MANUAL  
 

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