BassBoss Kraken-MK3 User manual

User Manual
Quad 21”
Powered
Subwoofer
Kraken-MK3

Kraken-MK3 User Manual bassboss.com
3
2
Table of Contents
Overview 2
QuickStartGuide 4
OutboardProcessorWarning 5
SetupProcedure 5
OperationandControls 6
IndicatorLEDs 6
HowtoUsethePresets 7
Pre-InstalledOnboardPresets 8
PowerDistribution 9
Troubleshooting 9
CardioidMode 10
Specifications 11
Warranty 12
SafetyInformation 13
ImportantNotes 14
FCCComplianceNotice 14
Overview
TheKrakenembraceisamonstrouslybeautifulthing.It’scrushing,it’sinescapable,anditfillsanyspace
withexcitementandwonder...You’llloveeveryminuteofit!Capableofalmostbrutalforce,everytime
there’sa Krakenonsite,theenergy level goesup.Whenyoureventsneed tobeintense...releasethe
Kraken!
HowdoestheKrakenpacktheoutputofatleastfourdouble-18”subwoofersintothesizeofjusttwo?
Whileit’spossibletotuneasmallcabinettoaverylowfrequencyusingverylongports,thoseportswould
tendtotakeupmorethanhalfofthecabinetvolume,requiringbiggercabinetsorhighertuning.
Estemanualestádisponibleenespañolennuestrositiowebenbassboss.com/support
Quad 21”
Powered
Subwoofer
Kraken-MK3

Kraken-MK3 User Manual bassboss.com
3
Ontheotherhand,tuningaverylargecabinettoaverylowfrequencyispossibleusingshorterports.
Thebiggerthecabinetvolume,theshortertheportsneedtobetotuneittoalowfrequency.Theshorter
theportsare,thesmallerthepercentageofinteriorcabinetvolumetheyoccupy,eectivelyleavingmore
roomformorewoofers.Sure,theKrakenisbigforasinglespeaker,butthepointisnotthesizeofthe
cabinet,it’sthescaleoftheoutput.Thinkofitasasubwooferwiththeeconomyofscale:TheKraken
deliversthehighestSPLrelativetosubwoofersize,barnone.
Technically,theKrakenisavented,short-horn,quad21”bandpasssubwoofer.Thefourdriversareloaded
intoa largeacoustical volume thatistuned to a low frequency,and the frontofeach driver is loaded
into a short horn. The vented enclosure section provides extended deep bass performance and the
foreshortened horn sections provide increased upper frequency sensitivity, which results in improved
transientresponse,aka“punch”.
Tobringthewholethingtolife,eachwooferispoweredbyadiscrete2500Wamplifier,makingthetotal
powerper cabinet animpressive 10,000Watts.Thisensurestheamps aren’t thelimitingfactor in the
outputoflowfrequencies.Providingabundantpowerpreventsoverheatingissuesandvirtuallyeliminates
thedamagethatclippingatoo-smallampcancause.
Thebigbeastiskeptunderyourcontrolbyanintegrated,comprehensiveDSP.TheDSPprovideshigh-
passfilters,low-passfilters,equalization,alignmentfiltersandlimiting.Avarietyofdierentfiltersettings
areavailableinpresets.Eightpresetsareavailableatthetouchofabuttonontheamplifier,andtheDSP
canstoreupto100presetson-board,allofwhichcanbeaccessedviasoftwareandaLANconnection.
Totakefurther advantageof the Krakens’ outputdensity,alignedarraysare facilitatedbyinterlocking
sliders.Blockarrays,side-by-sidearraysandfront/backcardioidconfigurationscanbedeployedwiththe
cabinetsinterlocked.Theoptionaltransportcartscansupporttwocabinets,allowingunparalleledtruck-
packdensity.Thecartsfeaturerecessesintowhichtheslidersfit.
There are two interesting advantages to the dual-opposed, force-canceling nature of the Kraken
design.Oneisthe absenceof front-to-backrockingmotion,whichbothreducestheamountoflateral
energy transmitted into floors, and makes the cabinets less prone to “walking”. The other is relatively
littlesecondaryradiationfromtherearofthecabinet.This,alongwiththedirectivityassociatedwithits
size,makestheareabehindaKrakenfairlyquietcomparedtoanarrayofconventionalcabinetscapable
of similar output. Ultimately, cardioid configurations of Krakens tend to require fewer rearward-facing
cabinetstoachieveeectivecancellationbehindthearray.
The cabinet itself is made from 18mm, 13-ply Birch plywood and is extensively braced. It is coated in
high-temperaturebondedpolyureaandfeaturespowder-coated,perforatedsteelgrilles.Thecabinetsare
axiallysymmetrical,featuringUHMWPolyethyleneslidersandsteelbarhandleson4sides.
The Kraken Powered Subwoofer was designed to provide body-and-face-melting bass on a massive
scaleforfestivalsystems,touringsystems,high-intensitynightclubs,artcars,carnivalfloatsand,notto
beforgotten,BASSHEADS,whoneedalittlebitmorethantheyhaveeverhadbefore...
Quad 21”
Powered
Subwoofer

Kraken-MK3 User Manual bassboss.com
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Quick Start Guide
1. Ensure the cabinet is secure and stable, on level ground.
2. Connect signal via the XLR-F input.
3. Connect the XLR-M connector to additional subs or tops.
4. Connect the mains power and verify the “Ready” LED is lit.
BASSBOSS systems are easy to set up quickly. The best possible results are achieved consistently
because of the integrated nature of the designs. All BASSBOSS loudspeakers are complete, integrated
systems, featuring the cabinet, transducer, amplifier and a comprehensive suite of processing. Setup
is particularly easy because the products integrate with each other.
Provided the cabinets are physically aligned, any BASSBOSS sub can be combined with any
BASSBOSS top and their outputs will be phase-coherent. This means no cancellations and no gaps in
the response at the crossover frequency, regardless of which preset is selected.
The on-board BASSBOSS processing allows for the following:
Any BASSBOSS powered subwoofer can be combined with any other BASSBOSS Powered subwoofer
and their outputs will sum coherently. (i.e.: in phase with each other.)
Any BASSBOSS powered subwoofer or combination of BASSBOSS powered subwoofers can be
combined with any BASSBOSS powered top and their outputs will sum coherently through the
crossover region.
HOWEVER only one model of top should be used at a time. An assortment of dierent tops cannot be
stacked together and still achieve coherence and clarity.
The following tops should be used individually, i.e. should NOT be arrayed:
AT312 (Co-axial point-source Main)
DiaMon (Co-axial point-source satellite)
SV9 (2-way monitor with Satellite mode)
The following tops can be used in arrays:
MFLA (Medium Format Line Array, up to 20 cabinets can be arrayed)
AT212 (Horizontally arrayable when necessary)
DV12 (Arrayable in PAIRS ONLY with the upper box of the pair inverted.)

Kraken-MK3 User Manual bassboss.com
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Outboard Processing Warning
Third-party outboard processing (Drive Racks, etc.) are not recommended and are not necessary
with BASSBOSS MK3 series powered loudspeakers. Outboard processing will not improve, and
will very likely degrade the sound quality, reliability and output capacity. Using external processing
inappropriately can cause driver damage that is not covered by warranty.
The internal processing can accomplish everything an external processor could accomplish, but
without degrading the sound quality and without putting components at risk. Before considering
using an outboard processor, contact BASSBOSS customer service with your use-case scenario for
assistance in setting up the internal processing to achieve your goals.
Setup Procedure
Once the cabinet is in the desired location, signal cables should be connected via the XLR-F input. It’s
recommended to run balanced signal cables to minimize the chance of noise and ground-loop hum.
The incoming signal should be unprocessed because all the necessary processing is done in the built-
in DSP. The signal should be run directly from the outputs of a mixer or controller.
The XLR-M connector provides a full-range, unprocessed, pass-through connection to additional
cabinets. This output can be connected to additional subs or tops. Up to 12 cabinets can be connected
on a single output from a mixer or controller.
Connecting the mains power. The power connector is a Neutrik PowerCON TOP waterproof type. The
power connector inserts with the silver tab rotated counter clockwise from vertical, at about the 10:00
position, and once inserted, rotates clockwise to the 12:00 position to lock in place. Once locked, this
connector is waterproof.
This connector also serves as the power switch. To disconnect and remove the connector, pull back
on the silver tab to unlock it and rotate it counter clockwise. Once rotated to the insertion angle, the
connector can be removed.
When connecting and disconnecting, no force should need to be applied. If the connector doesn’t
insert and rotate smoothly, either it’s in the wrong position or it’s damaged and should be replaced.
Always use a grounded outlet. The supplied power cord includes a standard grounding NEMA 5-15
(Edison) 120-Volt US wall plug. In unfamiliar locations it’s recommended to verify the correct wiring of
outlets before powering your system.
It’s highly recommended to connect all signal and power cords to the speakers before plugging the
power cords into mains outlets. When your speaker is powered on, you’ll see all the indicator lights turn
on and then show the system’s current status.

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Operation & Controls
There are 2 controls on the amplifier.
1: Input
This knob adjusts the input level from -72dB to -0dB. To avoid distortion and clipping, make sure the
input signal doesn’t exceed +22dB and the incoming signal doesn’t reach clipping before you achieve
the desired sound level.
While the amplifier has built-in limiters and safety features to protect itself and the speaker, it can’t
protect the speaker from distorted incoming signals. The amplifier will simply amplify the clipped signal,
which can do the same damage as clipping an amplifier. Since it’s essentially impossible for these
amplifiers to clip, signal-level clipping is the most common cause of damage to these speakers.
If you hear distortion, lower the signal level right away.
2: Preset Select
Pressing the Preset Select button cycles through presets 1-8, and pressing it again after preset 8 returns
to preset 1. Each preset includes all necessary low-pass and high-pass filters at the selected frequencies,
and all the necessary alignments to maintain phase coherence in the crossover range when used with
other BASSBOSS powered speakers.
Presets help you fine-tune the balance between the subwoofers and top speakers. More details on the
dierent combinations are on page 7.
Indicator LEDs
Indicator LEDs – Left side, bottom to top:
Ready: Indicates that power is on and the system is ready to play.
Signal: Indicates the presence of input signal.
-12dB: Indicates there is 12dB of headroom remaining before reaching maximum output.
-6dB: Indicates there is 6dB of headroom remaining before reaching maximum output.
Limiting: Indicates one of the channels is reducing the incoming signal level to prevent overdrive.
Overheat: Indicates the amplifier is reducing output to prevent shut-down from overheating.
Protect: Indicates the amplifier is shut down due to a condition that could cause further damage.
The Protect LED also is engaged when the system has been muted via the software.
Comm Link: Indicates communication is active on the LAN connection(s).
Indicator LEDs, Right Side, Bottom to top:
Presets 1-8 - The illuminated LED indicates the corresponding preset is loaded.

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How to Use the Presets
Setting the low-pass filter frequency on the subwoofer to match the top cabinet’s high-pass filter
frequency and matching their sound levels will achieve the smoothest sound across the frequency
range.
There are no incompatible combinations.
Selecting high numbered presets on subs with low-numbered presets on tops will result in increased
system output in the overlap range, which can be helpful in some situations but can also result in a
“boomy” sound.
When the subwoofer levels are to be run higher than tops levels, (which is almost always) the eective
crossover moves higher in frequency. If you intend to run your system “bass-heavy” it’s recommended
to run lower-numbered presets on the subs and higher-numbered presets on the tops to avoid an
excessively “boomy” sound.
Selecting low-numbered presets on subs with high-numbered presets on tops may result in a lack
of “punch” in certain combinations. This is most likely when not enough level is available from
the subwoofer(s).
When not enough output is available from the sub(s), using a preset combination with overlap can help
provide a little more bass level but it does limit the maximum level of the tops due to the added demand for
low-frequencies from the tops.
It’s recommended that you try several, if not all, combinations when first setting up to determine which
combination works best in each environment. You will likely choose dierent combinations for wood
floors, concrete floors and outdoors.
Experiment with dierent combinations to dial in your preferred combination in dierent environments.

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8
Pre-Installed Onboard Presets
High-pass and low-pass filters with included phase compensation.
Preset 1: 23 Hz - 60 Hz
Preset 2: 23 Hz - 70 Hz
Preset 3: 23 Hz - 85 Hz
Preset 4: 23 Hz - 80 Hz
Preset 5: 23 Hz - 85 Hz
Preset 6: 23 Hz - 90 Hz
Preset 7: 23 Hz - 95 Hz
Preset 8: Cardioid Mode (Useonlywhatcabinetisfacingawayfromtheaudience.)
**Preset 8 is the Cardioid mode setting. More information on using Cardioid Mode can be found on page 10.
Additional presets are accessible through software. See “How to Use the Presets” section for more information.
New presets will be available for download at bassboss.com/software as they are developed.
To be notified when new presets are released register your gear at: www.bassboss.com/support
Instructions on linking to your computer for remote monitoring and control: www.bassboss.com/software
Information and setup tips about how to get the best and most out of your system:
bassboss.com/edu

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Power Distribution
Connect no more than one Kraken to a single 120V, 20A circuit. When connecting to 120V mains, provide
each Kraken with a dedicated 20A circuit.
Although amplifiers for tops and subs may be specified to have the same “power” capacity, in practice,
amplifiers used for tops applications tend to draw significantly less current. Subwoofers draw far more
current than tops due to the demands for bass level and the duration of the notes.
All MK3 amplifiers can operate on mains supply from 100 to 250VAC. Amplifiers connected to higher
voltage mains supplies draw less current. To connect to voltages other than 120V, a dierent mains
connector plug must be used. Contact your salesperson for information about purchasing cables for
alternate voltages.
Do not connect Krakens through linking power connectors.
Troubleshooting
If, after following the previous instructions for setup, (see page 5,) you have no output from the
loudspeaker:
Verify that the green Ready LED is lit. If NOT lit, check the following:
1. Is the power cord plugged into a live outlet?
2. Is the Neutrik powerCON connector rotated into the locked position?
If the green Ready LED is lit, check the following:
1. Is the red Protect LED illuminated? The unit may be in protect mode or set into mute via software.
2. Is the signal cable connected to the input?
3. Is the signal cable connected to an operating output at the other end?
4. Is there signal flowing to the input? Check the integrity of the cable against a dierent cable.
5. Is the volume knob turned all the way down or at a very low level?
6. Is the signal flowing to the input full-range?
Filters in the signal may remove the operating frequencies of the loudspeaker receiving them.
7. If you’re connected via LAN, check the level and filter settings in the software.

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Cardioid Mode
Preset 8: Cardioid Mode
Toachievecardioidoperation,youneedatleastonesubwooferfacingtheaudienceandonecabinetin
cardioidmodeplacedfacingawayfromtheaudience.Ideally,youshouldhavetwocabinetsfacingthe
audience and one facing away from the audience. The cabinets facing the audience should have the
samepresetloadedinthem.ThecabinetfacingawayfromtheaudienceshouldbesettotheCardioid
preset-Preset8.TheCardioidModecabinetshouldbeplacedbetweentheaudience-facingcabinetsfor
cancellationdirectlybehindthearray.
Themain subwoofercabinetsfacetheaudienceanduseoneofthefirst 7 presets, while the cardioid
cabinetfacesawayfromtheaudiencewithPreset8 selected.Whentwocabinetsarefacingforwardand
oneisfacingbackwardincardioidmode,settheinputlevelsthesameforallcabinets,withthesamesignal
goingtoall.Whenonecabinetisfacingforwardandoneisfacingbackwardincardioidmode,setthecardioid
cabinet’slevel6dBlowerthantheforward-facingcabinet,withbothcabinetsreceivingthesamesignal.
Ifthere’sonlyonecabinetfacingforwardandanotheronefacingbackwardincardioidmode,youcan
placethecardioidcabinetontopoftheforward-facingcabinet.Ifyouplacethecardioidcabinetnext
totheforward-facingcabinet,positiontheforward-facingcabinetsfurtherawayfromthestageorthe
areawhereyouwanttoreducesoundlevels.Themostsignificantsoundreductionhappensalongan
imaginarylinedrawnfromthecenteroftheforward-facingcabinet’swooferbackthroughthecenterof
thecardioidcabinet’swoofer.
How and When to Use Cardioid Mode
Cardioidmodedoesn’tmakethesoundlouderfortheaudience.Instead,itreducesthebasslevelbehind
thesubwooferstacks.Whenyouhavetwosubwoofersfacingtheaudienceandaddathirdoneincardioid
mode,thesoundlevelinfrontofthetwosubwooferswon’tchangemuch.However,thesoundlevelbehind
themwilldecrease.
Insomesituationsawallorstructuremayreflectthesoundradiatingfromtherearofthesubwoofersback
towardstheaudience.Thatreflectedsoundcancausephasecancellationsleadingtoalossofimpactand
unevenfrequencyresponse.Cardioidmodecanhelpeliminatethosecancellationsbeforetheyhappen,
leadingtobettersoundqualityandimpactfortheaudience.
Area of
Reduced
Bass Level
Audience
Area

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Specifications
Acoustical
LoudspeakerDescription: High-outputQuad-21inchSubwoofer
FrequencyResponse(±3dB): 25–90Hz
MaximumSustainedOutput: 145dBSPL,1meter,half-space(groundplane)
MaxSPL(Peak)* 148dB
NominalDispersion(°Hx°V): 360x360-Cardioidmodeavailablewithmultipleboxes
Electrical
Amplification: 10,000Watts-4x2500WattdiscreteClassDamplifiers
Processing: IntegratedcomprehensiveDSPprovideshighpass,lowpass,equalization,phase
alignment,cardioidprocessingandlimiting
ElectricalConnectors,Amp: 1xNeutrikpowerCONTrue1TOPInput
ElectricalConnector,Mains: 1xStandardUS3-pin120Velectricalplug:NEMA5-15(Edison)
VoltageOperatingRange: 90-250VAC,45-65Hz
CurrentDraw,Nominal: 14A@120volts-7A@240V(typicalwithmusicprogram)
SignalInputConnectors: XLR-F
SignalOutputConnectors: XLR-Mpass-throughonly
DataConnectors: 2xEtherCONRJ45
Physical
EnclosureType: Vented,shorthornhybrid
Transducer: 4x21inchdiameter(540mm)neodymiummotorwooferswith4.5”diameter
(115mm)CCAWsplit-woundvoice-coils.Waterprooffibercompositecones
CabinetConstruction: 18mmBirchplywood,extensivebracing,dadojoints,steelhardware
Dimensions(HxWxD): 48”x48”x36”(121.92cmx121.92cmx91.44cm)-48.5”(124cm)highwithfeet
NetWeight: 460lbs.(209kg)
ShippingWeight: 550lbs.(249kg)withpallet
ExteriorFinish: Weatherproof,black,textured,bonded,high-pressurepolyureacoating
Grilles: Perforated,powder-coatedsteel
Feet: 8xUHMWPEstrips.2oneachof4sides
Handles: 8xSteelbarhandles.2oneachof4sides
FlyPoints: None.Ground-stackonly.
Optional
TransportDollies: 18mmBirchDollycartwith4lockingcastersandrecessestoacceptinterlocking
cabinetsliders
OnlineInformation: bassboss.com/kraken
Our proactive philosophy causes specifications to be subject to change whenever improvements are made.

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12
Warranty
WARRANTY INFORMATION | Our fully-transferable warranty covers all BASSBOSS products.
STANDARD CABINET WARRANTY
BASSBOSS loudspeaker cabinet integrity, including all joinery, fasteners, handles and wood, is
warranted against defects in materials and workmanship for a period of six (6) years from the date of
purchase. This warranty does not cover items that are intended to wear and can be replaced if worn
or damaged. Examples of items not covered by this warranty are cabinet feet, grilles and the finish or
coating applied to the cabinet.
ENHANCED COMPONENT WARRANTY
BASSBOSS amplifiers and electronic components are covered against failures due to defects in
materials and/or workmanship for a period of three (3) years from the date of purchase.
TRANSDUCER WARRANTY
Transducers are covered against failures due to defects in materials and/or workmanship for two (2)
years from the date of purchase.
WARRANTY SUPPORT
Warranty support is a service, and part of that service includes helping you prevent failures and
minimize repair and shipping costs. Please contact BASSBOSS immediately if you observe an issue.
Please do not ship products without obtaining a return authorization number (RMA) by contacting
BASSBOSS at bassboss.com/support. If you need to ship your speaker for service, BASSBOSS
technicians will provide assistance on shipping and packaging requirements specific to your
service needs.
WARRANTY LIMITATIONS
During the warranty period, if your loudspeaker malfunctions or fails due to any defect in components
or manufacturing, the failed parts will be repaired or replaced. This warranty does not extend to damage
resulting from improper installation, misuse, neglect or abuse. Warranty coverage and eligibility will be
determined upon inspection by BASSBOSS personnel. This warranty does not cover labor other than
that authorized and performed by BASSBOSS personnel. Service will be performed upon the return of
the failed unit, together with its original sales receipt or other proof of purchase, to BASSBOSS or an
Authorized Service Facility. Purchaser is responsible for all costs of shipping and handling. Cosmetic
damage is specifically excluded from this warranty. This warranty is rendered void if service, repairs
and/or modifications are attempted or made by anyone not specifically authorized by BASSBOSS to
perform said services. Please contact BASSBOSS or your local BASSBOSS dealer before attempting
any repairs and before shipping parts in for service. This warranty gives you specific legal rights, and
you may also have other rights, which vary from state to state.

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Safety Information
Important information regarding safety and the use of your loudspeakers:
To prevent potentially dangerous exposure to high levels of acoustic pressure, never stand in the
immediate vicinity of loudspeakers driven at a high level without hearing protection. Professional
loudspeaker systems are capable of causing sound pressure levels detrimental to human health.
When a transducer capable of producing high sound levels is being used, it is necessary to wear
ear plugs or protective earphones to prevent hearing damage.
Even seemingly non-critical sound levels (from approximately 95 dB SPL) can cause hearing
damage if people are exposed to it over a long period. Anyone exposed to these levels should use
appropriate hearing protection devices. System and venue owners and operators are encouraged
to make hearing protection devices available to all customers and sta members.
In order to prevent accidents when setting up the loudspeakers or loudspeaker stands, make sure
they are standing on a firm surface. Ensure that all additional hardware, fixings and fasteners used for
installation or mobile deployment are of an appropriate size and load safety factor.
Only use included, factory installed, internally secured M10 fly points when supporting cabinets. (Not all
models include these features.) Only use appropriately load-rated hardware. Never hang loudspeakers
from handles. Never drill or screw into cabinets to attach lifting points.
Pay attention to the manufacturers’ instructions and to the relevant safety guidelines. Regularly check
the loudspeaker housings and accessories for visible signs of wear and tear, and replace them when
necessary. Regularly check all load bearing bolts in the mounting devices.
Caution: Loudspeakers produce a static magnetic field even if they are not connected or are not
in use. Therefore make sure when erecting and transporting loudspeakers that they are nowhere
near equipment and objects which may be impaired or damaged by an external magnetic field.
A distance of 3 feet (1m) should be maintained between loudspeakers and sensitive equipment such as
CRT monitors or magnetic storage media.
Never attempt to carry out any operations, modifications or repairs that are not expressly described in
this manual. Contact your dealer or BASSBOSS support if the product is not functioning properly.
The audio system must comply with current local standards and regulations regarding electrical systems.
For installation purposes, BASSBOSS strongly recommends that this product be installed by a qualified,
professional installer who can ensure correct installation and certify that it is installed in compliance
with the regulations in force.

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14
FCC Compliance Notice
Note: This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference when the equipment is operated in a commercial environment.
This equipment generates, uses and can radiate radio frequency energy and, if not installed and used
in accordance with the instruction manual, may cause harmful interference to radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case the
user will be required to correct the interference at their own expense.
Important Notes
Shielded data cables must be used.
To minimize the occurrence of noise and interference, always use shielded signal cables. Avoid routing
signal or data cables close to equipment that produces high-intensity electromagnetic fields such as
transformers, power cables and loudspeaker wires.
Do not coil excess power cable. Do not coil or wrap power cables and signal or data cables together.

1219.20 [48.00] 1231.90 [48.50]
914.40 [36.00] 1219.20 [48.00]
152.32 [6.00]
50.80 [2.00]
609.60 [24.00]
190.50 [7.50]
101.65 [4.00]
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WARNING
This is a class A product. In a domestic environment, this product may cause radio
interferences, in which case the user may be required to take corrective measures.
Manufacturer
True Lee Loudspeakers | BASSBOSS 2028 E Ben White Blvd. #240-8220 Austin TX 78741
We declare, under our sole responsibility, that to the best of our knowledge to which this
declaration relates, our products are in conformity with the applicable requirements.
Product: DJ18-MK3 Subwoofer Intended use: Professional Audio Loudspeaker

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Kraken-MK3