USER GUIDE
KRK MODEL V-4
VIDEO SHIELDED
BI-AMPLIFIED
STUDIO MONITOR
KRK SYSTEMS, LLC.
5452 BUSINESS DRIVE
HUNTINGTON BEACH, CA. 92649
TEL: (714) 373-4600 FAX: (714) 373-0421
WEB SITE: WWW.KRKSYS.COM
EMAIL: [email protected]
SYSTEM GAIN
Input sensitivity is adjusted (counterclockwise reduces sensitivity) through a rear panel mounted trim control.
Adjustment range is from -30dB to +6dB. Factory preset gain is +6dB, which should suffice for most conditions.
Normally adjustments would only be made if you’re using your V-4 in a surround system and you need to balance
levels or if your monitor send is too hot and not adjustable. If an adjustment is necessary, you’ll need a small
flathead screwdriver and some measuring equipment. (E.g. tone or filtered noise generator and SPL meter)
Connecting Your System
POWERING ON
All connections should be made, all faders and controls should be set at their minimum levels, and all other
equipment should be powered on prior to powering on your V-4 monitors.
The power On/Off switch is located on the rear panel and is internationally marked to indicate the operational
status. ( — ) = ON and ( O ) = OFF. A yellow LED illuminates the trademarked KRK Triangle on the front baffle
when power is applied.
NOTE: MAKE SURE THAT THE VOLTAGE INDICATOR FOUND IN THE MIDDLE PORTION OF THE IEC MAINS
CONTROL IS SET TO THE CORRECT VOLTAGE SETTING FOR YOUR VOLTAGE.
CHANGING VOLTAGE
To change the voltage, remove the power cord, pry off the fuse block with a small flathead screwdriver (look for
indent on the left inside of the power cord insert). Slide the circuit board out of the fuse block, rotate 180º and
reinstall the fuse block. Please note when making fuse changes, the fuses will have to be replaced. (see
Changing Fuses section below) Make sure and align the white arrow with the raised arrow located on the
power entry module before reinstalling. Check to see if the correct voltage can be read from left to right in
the voltage window before powering up.
CHANGING FUSES
Under normal operation the fuses should not blow. A blown fuse usually indicates an overload or fault condition.
To change the fuse, remove the power cord, pry off the fuse block with a small flathead screwdriver (look for
indent on the left inside of the power cord insert) and change the blown fuses.
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•
100~120VAC use 2 amp 250V 5mm x 20mm fuses
220~240VAC use 1 amp 250V 5mm x 20mm fuses
If the fuses blow immediately upon power up, this indicates a fault condition and the monitor should be
returned to KRK for repair.
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NEUTRIK® COMBO CONNECTOR
The Neutrik® Combo connector accommodates ¼” phone plugs, XLR, TRS. Please note that PIN 2 is hot! If you are
using an unbalanced connection make sure and wire PIN 1 and PIN 3 together at the source end.
Installing Your Monitors
The close-field monitor, by definition, reduces room interaction. This can be compared to the conventional stereo
configuration or the large monitor arrangement in a recording studio where sounds emanating from the monitor or
reflecting off ceilings, walls, and floors greatly affect the sound quality. By shortening the path to the ear, the
close-field monitor offers a tremendous amount of flexibility, allowing the sound to become less susceptible to
differing room conditions.
Positioning Your Monitors
Positioning your monitors correctly in the studio is critical to their performance. Typically, they should be placed
so that that the listening position is fully "covered" with all monitors resting on the same horizontal plane. A great
way to test a monitor for its imaging capability is to play back a CD or DVD recorded acoustically in stereo (or one
recorded in surround sound if you have a surround sound set-up). We recommend acoustic music because it
represents the spectrum of sound.) You can adjust the angle of each monitor by listening for dead spots. Keep in
mind, changing the angle or position of a monitor will change the sound.
2-CHANNEL SET-UP
Close-Field Configuration - In a control room situation, the monitors are often times placed on the meter bridge
or in a close-field listening position. Initial placement starts by measuring out a simple equilateral triangle (all
three sides equal in length) with the apex at the center of the listening position (as shown in Figure 1) as an
"overlay" for the stereo installation. In this configuration, the Left and Right monitors are each placed at a 60º
angle equidistant from the listening position.
Figure 1
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Mid-Field Configuration – This configuration is basically the same as the Close-Field set-up. (see Figure 2) It is
normally used with larger monitors or when the monitors are too large or heavy for the meter bridge. This set-up
has the potential for a larger sweet spot and better spatial imaging. Make sure that the height of the woofer is
above height of the console.
Figure 2
SUBWOOFER SET-UP
Begin by determining the best location for your subwoofer. If possible, the optimum set-up would look like the
set-up in Figure 3. This set-up may not be practical or possible in your room. Once you have set up your
monitors. Listen to some program material that you know has low frequency information recorded on it.
Different locations may create a phase misalignment. Most Subwoofers have a phase switch on them. Flip the
phase switch. The bass response volume will either increase or decrease in volume. Whichever setting gives you
the loudest response from your seating position is in phase. After you have the proper phase setting you will need
to adjust the output level of the Subwoofer to a level that provides a smooth blend of the bass volume with that
of your monitors.
Figure 3
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5.1 CHANNEL SURROUND SET-UP
Begin set-up by placing the Left and Right front channels 30º degrees from the Center channel and equidistant to
the listening position (Figure 4). The Left Surround (Rear) and Right Surround (Rear) channels should be placed
110º degrees from the Center channel. Their location should also be equidistant from the listening position. The
subwoofer (Low Frequency Effects) channel is most effective when situated directly below the Center channel (as
shown in Figure 4). If this is not possible place the subwoofer just to the right or left side and below the Center
channel. Make sure that the woofers are above the height of the console.
Figure 4
Once the monitors have been placed, you need to adjust the SYSTEM GAIN pots (see page 2) for each monitor so
that all channels have exactly the same SPL output at the listening position. Although this can be done simply by
listening to each channel one at a time and adjusting for relative levels, we recommend using an SPL meter and
filtered noise (pink noise) to test each channel independently. Simply take a reading from each monitor, and
then adjust all the monitors to match your lowest SPL reading. Your system levels should now be balanced for
multi-channel surround.
The most significant thing to remember is that each room presents it’s own set of acoustic variables. You'll want
to experiment a bit to arrive at the best possible sound for your room.
IMPORTANT NOTE: Your V-4 was originally packaged in a specially
designed carton and included special packing materials. Please
save these items. They should be used when transporting or
shipping your V-4.
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Design Goals
KRK’s design goal for your V-4 was to create a monitor capable of accurately reproducing sound with clarity and
accuracy. Other monitors in the marketplace tend to modify, extend, or “tilt” their response above 1 kHz to
sound more “spatial, exciting and impressive”. What is not mentioned is this practice tends to make you
incorrectly balance your mixes to compensate for this effect, leading to poor “translation”.
Your V-4 was designed to reproduce the signal with a minimal of frequency enhancement. Rather than
attempting to defy physics, your V-4 delivers unaltered high frequencies and excellent low frequency response
with exceptional accuracy from dual 8” woofers in a reasonably small cabinet.
System Highlights
Ability to Translate - An often-repeated phrase that we hear at KRK about our monitors’ performance is their
ability to translate. A mix made on your V-4’s will translate to other environments and other monitors with no
surprises. They will perform flawlessly for years in the professional and non-professional environment alike.
Flexibility - Your V-4 monitor contains an active input circuit specifically designed for balanced or unbalanced
input signals. The audio input connector accepts XLR and ¼” phone or TRS connectors.
Active Filter Crossovers - Each monitor cabinet contains three active filters. (Subsonic, low-pass and high-
pass filter) These three filters work together to deliver superior linear frequency response. Active filter
crossovers generate less heat resulting in no signal drift or component variations to provide a more stable image.
Balanced Power – KRK’s amplifier construction is proven, durable and straightforward. Output wattage is
balanced to match LF and HF driver sensitivities and power handling. Your V-4 monitor uses a toroidal power
transformer for lowest possible hum and minimum noise artifacts.
No Compression - Your V-4 contains no signal compression, which artificially limits the dynamic range of the
program source found in some competing products. Although signal compression is often used to make monitors
sound louder, fuller, and to control unwanted characteristics of the raw drivers, the result is a compromised mix.
Your V-4 design is uncomplicated without extras between you and your mix.
Furniture-Grade Construction - The cabinetry of your V-4 is constructed from ¾” medium density fiberboard
with a robust 1” thick front baffle. It is internally braced to minimize cabinet resonance. All cabinet edges and
port openings are heavily radiused to reduce edge diffractions and port flutter. Cabinet finish is a neutral
fingerprint proof gray Zolatone®.
Custom Made Drivers - KRK is renowned for using the highest performance drivers available in our products.
Your V-4 carries on this tradition. A woven Kevlar® LF driver was custom-designed specifically for this cabinet
volume with one goal in mind, “minimal compromises, no surprises”. Kevlar® is one of the strongest, lightest,
most rigid materials that can be used in modern speaker cone construction.
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Troubleshooting
Problem: If there is no power, check to see if...
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The power cord is plugged into both the IEC socket on the rear panel of the unit and into the AC mains
The AC mains voltage is matched to the operating voltage requirements (See Changing Voltage in the
Connecting the System section on page 3). If the AC mains voltage is higher than the V-8’s selected
voltage it is possible that the fuse needs to be replaced. (See Changing Fuses in the Connecting the
System section on page 3).
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The power light is illuminated on the front panel of the V-4. If not, turn the power switch OFF and check
the A/C mains fuse(s). NEVER USE A LARGER AMPERAGE FUSE THAN IS SPECIFIED! Turn the power switch
back on. The power light should illuminate.
If a fuse change was needed and upon powering the monitor back up the fuse(s) blow again, the monitor
needs to be returned to the dealer you purchased it from or to KRK for servicing.
Problem: If you can't hear any sound...
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Repeat steps in the previous troubleshooting section above before continuing to the next steps.
Check to see if all other audio devices using the same AC outlet are still operating.
Make sure that:
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The audio source cable is plugged into both the source output and the monitor input.
The System Gain pot is turned up fully clockwise (+ 6 dB).
The signal source (E.g. mixing console, work station, CD player, etc.) is turned up to a level that can
properly send a signal to the monitors.
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If one of the monitors is working. Exchange the audio input cable from the non-working monitor to
the working unit. This will determine whether it's really the monitor, a faulty cable, or some other
glitch in the audio chain.
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If the monitor is still not responding, it should be returned to the dealer that you purchased it from or to
KRK for servicing.
Problem: If the monitor suddenly stops working...
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Turn the monitor send down or off.
Repeat steps in the troubleshooting sections above before continuing to the next steps.
Carefully check to see if the amplifier's back plate is hot! If the monitor has been running at highest
power output for an extended period of time, it could be that the unit has become overheated and the
protection circuitry has shut the system down momentarily. The V-4 provides maximum circuitry
protection against AC power surges, amplifier overdrive, and overheating of the amplifiers. Turn the
monitor off then wait 30 minutes to allow the back plate to cool down. Turn the power switch back on.
Increase the volume to check for normal operation.
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If the monitor is still not responding, it should be returned to the dealer that you purchased it from or to
KRK for servicing.
Problem: The sound quality changes...
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Repeat steps in the previous troubleshooting section above before continuing to the next steps.
Disconnect the signal cable at the input of the monitor. With power on, place your ear close to each
driver (tweeter/woofer) and listen for noise (i.e., a slight hiss or hum). If there's absolutely no sound
whatsoever, it could be that one or more of the drivers (woofer or tweeter or both) is at fault. It's also
possible that the problem lies somewhere in the electronics.
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Play some non-distorted source material at a low volume. Carefully cover the tweeter (to block the
sound) without touching the diaphragm. Is the woofer producing a clean sound? If there is not a clear
tonal quality or any sound at all then the woofer probably needs to be replaced.
Cover the woofer so you can hear mostly the tweeter. Is the tweeter producing a clear sound? If there is
not a clear tonal quality or any sound at all then the tweeter probably needs to be replaced.
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Once you have a better idea of what may be at fault then call us and speak with someone in the service
department. They will help you determine the best solution to correct your monitors. The service
department can be reached at (714) 373-4600 ext. # 21.
Problem: The monitor hisses, hums or makes other loud noises...
Here are some suggestions that will help you eliminate these undesirables from your system:
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Make sure that the power cord is plugged snugly into the IEC socket on the rear of the monitor.
Check the connections between the signal source and the monitor. The V-4's Neutrik® Combo connector is
a completely balanced system. If you're connecting an unbalanced output to the monitor, be sure that
you're using PIN 2 for signal and have PIN 1 and PIN 3 tied together at the source end.
Refer to the Connecting the System section on page 4 of this manual to ensure that the AC mains is
matched to the operating voltage requirements.
All audio equipment should use the same ground point. Check all other devices using the same AC output
in the building like dimmers, neon signs, TV screens, and computer monitors. These devices should not be
using the same circuit.
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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 SYSTEMS, LLC.
5452 BUSINESS DRIVE
HUNTINGTON BEACH, CA 92649
(714) 373-4600
ATTENTION: SERVICE DEPARTMENT
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•
•
For the safest possible return to KRK, please use the shipping carton and packaging that your V-4 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. for $26.50 each.
For replacement part quotes call (714) 373-4600 ext. #21.
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Specifications
THE V-4 POWERED STUDIO MONITOR
Frequency Response
High Frequency Driver
65Hz -20Hz ±2dB
1” (25mm) Fabric Dome
®
Low Frequency Driver
Dimensions
Net Weight
4” (100.4mm) Woven Kevlar , High Sensitivity Voice Coil
6” W x 9-1/4” H x 7-3/4” D (152mm W x 235mm H x 197mm D)
9 lbs. ea. (20 kg)
THE V-4 AMPLIFIER
Power Rating
Signal to Noise
T.H.D
Input Impedance
Input Sensitivity
Gain
15 Watt HF Amplifier 30 Watt LF Amplifier
>90dB
<.05% at full output 1khz
10k Ohms Balanced Input
+6dB to –30dB
26dB (Fixed)
Power Consumption
50 VA
THE V-4 CROSSOVER
Crossover Frequency
Crossover Slope
1.7kHz
HF -12dB/Octave Butterworth
LF -12dB/Octave Butterworth
12dB/Octave -3dB @ 32Hz
Subsonic Filter
FEATURES
®
Neutrik Combo Connector accepts XLR and ¼” phone and TRS connectors
IEC Mains Connector
System Gain Control
LED Power Indicator
Power On/Off Muting and Delay
KRKandV-4areregisteredtrademarksofKRKSystems,LLC.
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Safety Instructions: English
This symbol is intended to alert the user of important operating and maintenance (servicing) instructions in
the literature provided with the equipment.
This symbol is intended to alert the user of the presence of un-insulated “dangerous voltage” within the
products enclosure that may present a risk of electric shock.
Caution: To prevent the risk of shock, do not remove the cover (or open the speaker enclosure). There are
no user serviceable parts inside. Refer servicing to qualified service personnel.
CAUTION
Retain Instructions: The Safety instructions should be kept for future reference.
WARNING
Power Sources: This equipment should be operated only from power source indicated on the
product. This equipment is intended to be used with a main power system with a grounded (neutral)
conductor. The third (grounding pin) is a safety feature, do not attempt to bypass or disable.
Servicing: Refer all Servicing to qualified personnel. Do not attempt to remove covers or
disassemble monitor enclosure because opening or removing covers may expose you to dangerous
voltage or hazards.
This monitor is capable of producing very loud sound pressure levels. Caution should be taken to
protect your ears with OSHA approved noise suppression devices to avoid permanent hearing loss.
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Explanation of graphical symbols
The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert the user
to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of
sufficient magnitude to constitute a risk of electric shock to humans.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of
important operating and maintenance (servicing) instructions in the literature accompanying the
product.
CAUTION: To reduce the risk of electric shock, do not remove the cover. No user-serviceable parts
inside. Refer servicing to qualified service person.
WARNING: To prevent fire or electric shock, do not expose this equipment to rain or moisture.
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Consignes de Securite: Francais
Ce symbole sert à avertir l’utilisateur que la documentation fournie avec le matérial contient des
instructions importantes concernant l’exploitation et la maintenance (rèparation)
Ce symbole sert à avertir l’utilisateur de la présence dans le boìtier de l’appareil de “tensions
dangereuses” non isolées posant des resques d’électrocution.
Attention: Afin d’éviter tout danger d’électrocution, ne pas enlever le couvercle(ni ouvrir le boitier).
Aucun des éléments internes ne peut être réparé par l’utilisateur. S’adresser à un technicien de
maintenance qualifié
Attention
Lire les instructions- Prendre connaissance de toutes les consignes de sècurité et d’exploitation
avant d’utiliser le matériel.
Avertissement
Alimentations Ne faire fonctionner ce matériel qu’avec la source d’alimentation indiquée sur I’
appareil. Ce matériel doit être utilisé avec une alimentation principale comportant un fil de terre
(neutre). Le troisième contact (de mise à la terre) constitue un dispositif de sécurité: n’essayez pas
de la contourner ni de la désactiver.
Réparation-maintenance Faire exéculer toutes les interventions de réparation-maintenance par un
technicien qualifiè. L’utilisateur ne doit pas essayer de procéder lui-même à ces opèrations car
l’ouverture ou le retrait des couvercles risquent de l’exposer à de hautes tensions et autres dangers.
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Explication des symboles graphiques
Le symbole “éclair” avec fléche à l’intérieur d’un triangle équilatéral est utilisé pour alerter
l’utilisateur de la presence à l’intérieur du coffret de “voltage dangereux” non isolé d’ampleur
suffisante pour constituer un risque d’elétrocution.
Le symbole d’exclamation à l’intérieur d’un triangle équilatéral est employé pour alerter les
utilisateurs de la présence d’instuctions importantes pour le fonctionnement et l’entretien (service)
dans le livret d’instructions accompagnant l’appareil.
ATTENTION: Pour eviter les risques de choc électrique, ne pas enlever le courvercle. Aucun
entretien de piéces intérieures par l’usager. Confier l’entretien au personnel qualifié.
AVIS: Pour eviter les risques d’incendie ou d’electrocution, n’exposez pas cet article à la pluie ou a
l’humidité.
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