KRK KRK10S2 Users Manual

KRK10s SUBWOOFER

USER GUIDE

Warning: To reduce the risk of fire or electric shock, do not

expose this unit to rain or moisture.

T

he lightning flash with an arrowhead symbol within an equilateral
triangle, is intended to alert the user to the presence of uninsulated
d

angerous voltage within the product’s enclosure that may be of
sufficient magnitude to constitute a risk of electric shock to persons.

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.

Do not place this unit on an unstable cart, stand or tripod, bracket
or table. The unit may fall, causing serious injury to a child or adult
and serious damage to the unit. Use only with a cart, stand, tripod,
bracket or table recommended by the manufacturer or sold with
the unit. Any mounting of the device on a wall or ceiling should
follow the manufacturer’s instructions and should use a mounting
a

ccessory recommended by the manufacturer.

An appliance and cart combination should be moved with care.
Quick stops, excessive force and uneven surfaces may cause the
appliance and cart combination to overturn.

Read and follow all the safety and operating instructions before
connecting or using this unit. Retain this notice and the owners
manual for future reference.

All warnings on the unit and in its operating instructions should be
adhered to.

Do not use this unit near water; for example, near a bath tub,
washbowl, kitchen sink, laundry tub, in a wet basement or near a
swimming pool.

The unit should be installed so that its location or position does not
interfere with its proper ventilation. For example, it should not be
situated on a bed, sofa, rug or similar surface that may block the
ventilation openings; or placed in a built-in installation, such as a
bookcase or cabinet, that may impede the flow of air through its
ventilation openings.
The unit should be situated from heat sources such as radiators,
heat registers, stoves or other devices (including amplifiers) that
produce heat.

The unit should be connected to a power supply outlet only of the
voltage and frequency marked on its rear panel.

The power supply cord should be routed so that it is not likely to be
walked on or pinched, especially near the plug, convenience
receptacles, or where the cord exits from the unit.

Unplug the unit from the wall outlet before cleaning. Never use
benzine, thinner or other solvents for cleaning. Use only a soft
damp cloth.

The power supply cord of the unit should be unplugged from the
wall outlet when it is to be unused for a long period of time.

Care should be taken so that objects do not fall, and liquids are not
spilled into the enclosure through any openings.

This unit should be serviced by qualified service personnel when:
A. The power cord or the plug has been damaged; or
B. Objects have fallen, or liquid has been spilled into the unit; or
C. The unit has been exposed to rain or liquids of any kind; or
D. The unit does not appear to operate normally or exhibits a
marked change in performance; or
E. The device has been dropped or the enclosure damaged.

DO NOT ATTEMPT SERVICING OF THIS UNIT

YOURSELF. REFER SERVICING TO QUALIFIED

SERVICE PERSONNEL

Upon completion of any servicing or repairs, request the service
shops assurance that only Factory Authorized Replacement Parts
with the same characteristics as the original parts have been used,
and that the routine safety checks have been performed to
guarantee that the equipment is in safe operating condition.
REPLACEMENT WITH UNAUTHORIZED PARTS MAY RESULT IN
FIRE, ELECTRIC SHOCK OR OTHER HAZARDS.

ATTENTION

POUR …VITER LES CHOC ELECTRIQUES, INTRODUIRE LA
LAME LA PLUS LARGE DE LA FICHE DANS LA BORNE
CORRESPONDANTE DE LA PRISE ET POUSSER JUSQUíAU
F

OND.

CAUTION

TO PREVENT ELECTRIC SHOCK, MATCH WIDE BLADE OF
PLUG TO WIDE SLOT FULLY INSERT.

If an indoor antenna is used (either built into the set or installed
separately), never allow any part of the antenna to touch the metal
parts of other electrical appliances such as a lamp, TV set etc.

C

AUTION

POWER LINES

Any outdoor antenna must be located away from all power lines.

OUTDOOR ANTENNA GROUNDING

If an outside antenna is connected to your tuner or tuner­preamplifier, be sure the antenna system is grounded so as to
provide some protection against voltage surges and built-up static
charges. Article 810 of the National Electrical Code, ANSI/NFPA No.
70-1984, provides information with respect to proper grounding of
the mast and supporting structure, grounding of the lead-in wire to
an antenna discharge unit, size of grounding conductors, location
of antenna discharge unit, connection to grounding electrodes and
requirements for the grounding electrode.

a. Use No. 10 AWG (5.3mm2) copper, No. 8 AWG (8.4mm2)
aluminium, No. 17 AWG (1.0mm2) copper-clad steel or bronze

wire, or larger, as a ground wire.
b. Secure antenna lead-in and ground wires to house with stand-off
insulators spaced from 4-6 feet (1.22 - 1.83 m) apart.
c. Mount antenna discharge unit as close as possible to where lead­ in enters house.
d. Use jumper wire not smaller than No.6 AWG (13.3mm2) copper,
or the equivalent, when a separate antenna-grounding electrode
is used. see NEC Section 810-21 (j).

EXAMPLE OF ANTENNA GROUNDING AS PER NATIONAL
ELECTRICAL CODE INSTRUCTIONS CONTAINED IN
ARTICLE 810 - RADIO AND TELEVISION EQUIPMENT.

NOTE TO CATV SYSTEM INSTALLER: This reminder is
provided to call the CATV system installers attention to
Article 820-40 of the National Electrical Code that provides
guidelines for proper grounding and, in particular, specifies
that the ground cable ground shall be connected to the
grounding system of the building, as close to the point of
cable entry as practical.

CAUTION

RISK OF ELECTRIC

SHOCK DO NOT OPEN

ATTENTION:

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

C

AUTION: TO REDUCE THE RISK OF ELECTRIC

SHOCK, DO NOT REMOVE COVER (OR BACK). NO

USER SERVICEABLE PARTS INSIDE. REFER SERVICING

TO QUALIFIED SERVICE PERSONNEL.

IMPORTANT SAFETY INSTRUCTIONS

1. “An apparatus with Class I construction shall be connected to
a mains sockets outlet with protective earthing connection.”

2. “Where the mains plug or an appliance coupler is used as the
disconnect device, the disconnection device shall remain readily
operable.”

3. “1A fuse is used to US market, voltage will be set to 115V before
shipment: 500mA fuse is used to European market, voltage will
be set to 230V before shipment.”

World Class Performance in Studio Reference Monitors

KRK’s industry-leading line of studio monitors and subwoofers provide a level of precision
and performance unheard of in monitor systems. Your KRK10s subwoofer features
several key design elements that have come to be recognized as the “studio standard” for
the world's finest engineers, producers, and musicians. Your KRK subwoofer delivers
world-class performance—at a price that makes this a truly uncommon value.

Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Unpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

KRK Systems’ Design Philosophies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3

System Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Connecting Your System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Hooking Up Your Subwoofer: Stereo Systems . . . . . . . . . . . . . . . . . . . . . . . . . . .7

Subwoofer Placement and Set Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Hooking Up Your Subwoofer: 5.1 Surround . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Bass Management Theory . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Removing the Subwoofer Grill . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14

Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Introduction

Congratulations! Welcome to the latest KRK subwoofer series which includes the KRK10s.
This KRK subwoofer series provides even better performance and accuracy, raising the bar
once again above the competition. We aren’t the new standard. We have always been the
standard among the world’s finest engineers, producers, musicians and DJs.

This manual is intended to inform you of the many features of your new KRK subwoofer and
its operation. We encourage you to take a few minutes to familiarize yourself with the
information in this manual. Thank you for choosing KRK!

SAFETY: For your safety and to ensure correct operation of this product, please take a
moment to read the IMPORTANT SAFETY PRECAUTIONS section.

CAUTION: Never remove the rear panel of the subwoofer. To do so could result in
electric shock. A qualified technician should perform any repair or service to the
electronics.

This product is capable of producing sounds at a volume that could potentially be
damaging to hearing and result in permanent hearing loss over an extended period of time.

IMPORTANT NOTE: Unpacking and Visual Inspection

Your KRK subwoofer was originally packaged in a specially designed carton with
packaging materials designed specifically for this unit. Please save these items. They should
be used when transporting or shipping your subwoofer. These will help preserve your
warranty.

1

Unpacking

Your new subwoofer has been carefully inspected and tested prior to packing and shipping.
After unpacking your subwoofer, carefully inspect it for exterior damage and immediately
report any physical damage during transit to your shipping carrier. Save the shipping boxes
and all packaging materials in case the unit needs to be returned to your local dealer or Gib­son Pro Audio.

Please read the warranty card that was included in the shipping carton with your product
before shipping to KRK Systems. A Return Material Authorization (RMA) from KRK Systems
is required before shipping a product to KRK Systems for repair. After obtaining a RMA from
KRK Systems, all KRK Systems products in need of repair can be returned to Gibson Pro
Audio.

• For the safest possible return to KRK, please use the shipping carton and
packaging materials that were originally provided with your subwoofer.

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

• If your subwoofer is out of warranty, Gibson Pro Audio’s Customer Service Department
can help direct you to a KRK authorized service center.

• For service or replacement parts information please call KRK Customer Service
(1-800-444-2766 or [e-mail]).

2

KRK Systems’ Design Philosophies

Thank you for purchasing the KRK10s active studio subwoofer. We are the most
dedicated monitor company in the world and we are thrilled you have joined our
ever-growing family of loyal customers.

Our Focus is Your Mix

At KRK, our focus has always been to make the most accurate studio monitors available at
any price.

We don’t offer PA gear, mixers or motorcycles – just the tools you need to deliver a great
mix. From the legendary Exposé Series, to the new VXT to the RoKit Generation 2 (“G2”)
series – we know recording monitors.

We do not add sonic characteristics like some other manufacturers that make their
monitors appear to provide more SPL or add low frequencies that demo well in the store.

When you use a KRK monitor, you can be confident that your mixes will translate well to the
wide variety of playback conditions that can occur in the real world. We want your audio
mixes to sound good everywhere – not just in your studio!

Port Design

Our ports are designed to greatly reduce air flow turbulence for high performance audio
reproduction. The result? Clear, accurate and well designed low frequency extension.

Even More Accurate than Before

We tweaked our speaker voicing to provide even more accurate frequency response for
amazing audio reproduction using our custom made KRK drivers. What you hear is what
you get, where ever your music is being played. Our drivers are all custom-designed by
our world-class studio monitor engineering team.

Imitation but not Perfection – A Statement to our Competition

If the sincerest form of flattery is imitation, we must own that aspect of the recording
monitor world. From using Kevlar in driver designs to copying our radiused edge approach,
the competition knows a good thing when they hear it. However, chasing our past won’t
deliver a product that comes close to the sound of a KRK monitor. See ya later
competition!

Enough About Us – Let’s Get Going!

So enough about why we do the things we do. Let’s read on about the features of your new
KRK subwoofer so you can start enjoying your new subwoofer now!

3

KRK’s ERGO Room Correction System

KRK provides a stand alone, high performance room correction system called ERGO. ERGO
provides the ability to use up to two subwoofers with dedicated crossover functionality and
delay compensation. For more information about using ERGO with your monitoring system
please visit our website at www.krksys.com.

4

System Controls

ON

OFF

Volume

The input sensitivity is adjusted
(c oun t er c lo c kwi s e red u ce s
sensitivity) with the rear panel
mounted Volume control.

Adjustment range is from -30dB to
+6dB. Factory preset gain is +6dB. You may need
to adjust this to match the level of your monitors.

L o w - P a s s F r e q u e n c y

Adjustment

Low-Pass Frequency adjustment is

performed through a continuously

variable adjustment. The range is

from 50Hz to 130Hz. If you are
using the Subwoofer Line Outs for the monitors,
you will want to place this at the 80Hz position
(see additional information in the

Installing Your Monitors section).

Phase Switch

Functionally, the Phase switch is a polarity inversion mechanism whose
position affects the phase relation of the subwoofer output to the other
speakers in your room. The proper switch position of 0 or 180 degrees
depends on a number of variables. These variables include, the distance of

the subwoofer from the listening position and monitors, as well as the
system's absolute polarity and the bass response of the room (refer to the Subwoofer
Setup and Placement section in order to determine the correct switch position for your
monitoring system and room).

Using the Ground Lift

Engaging the ground lift switch can sometimes reduce ground loop noise in

your system. By providing an AC mains ground on the KRK10s and proper

installation in a 'quiet studio' environment, the system is happily quiet.

However, noise will be induced if the monitor is installed in less than

desirable settings (i.e. audio cables run alongside power cables, behind
refrigerators, near florescent lighting, older buildings with bad wiring), or with certain
equipment with lots of Radio Frequency Interferece (RFI) (lap-top supplies, PCs, generator
supplied AC lines). This is because there is a ground loop through the sub panel, mains
wiring, source, and back to the subwoofer on Pin-1 of the Audio inputs. Ground currents
traveling through this loop impose different voltages along the path at different gain stages
within the circuitry, thus creating noises.

The Ground lift switch does not affect the AC mains/panel safety ground. It does not 'open'
the connection thru Pin-1 to the panel, but increases the resistance (from zero ohms to one
thousand ohms) to reduce the ground current and induced noises. Safety is not
affected.

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