KNS SERIES
PROFESSIONAL HEADPHONES
KNS6400
KNS8400
USER MANUAL
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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”.
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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
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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.
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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
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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!
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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.
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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
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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.
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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.
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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.
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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.
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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
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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.
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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.
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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.
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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.
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18
NOTES
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19
LITK00063 - REV B - KNS USER MANUAL
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