Harman JBL Stadium 1224 User manual

STADIUM SUBWOOFERS
®
THANKYOUfor choosing a JBL
Stadiumsubwoofer. These subwoofers
are designed tosuitabroadrangeofcar
audioapplications andcan be used in a
widevarietyof enclosure typestoproduce
extended, powerful bass ina limited
amountofvehicle space. Togetthemost
performance from yournewsubwoofer,it
is stronglyrecommended that you havea
qualifiedprofessionalinstallyour
subwoofer.Althoughthismanualdoes
providegeneralinstructionsabout
installingthese Series subwoofers, it does
notinclude enclosure constructiondetails
orexactinstallationmethodsforany
particular vehicle. If youdo not feel that
you have the necessary experience, do not
attempt theinstallationyourself,but
instead ask yourauthorized JBL dealer
aboutprofessionalinstallationoptions,
Remembertokeepyour sales receipt in a
safe place,along with thismanual, so
that both areavailablefor future
reference,
WARNING
Playingloud music in avehicle can hinder
your ability tohear traffic and
permanentlydamageyourhearing.The
maximumvolumelevelsachievable byJBL
speakers whencombined with high-power
amplificationmay exceed safe levels for
extendedlistening. Using lowvolume
levels is recommendedwhendriving. JBL,
Inc. accepts no liability forhearing loss,
bodilyinjury,or property damage as a
resultof use or misuse ofthisproduct,
REPRODUCING
BASS IN VEHICLES
Depending on the size ofyour vehicle's
interiorlistening space, reproduced bass
frequenciesbelow 80Hz will beboosted
bynearly12dBperoctave as frequency
decreases. This phenomenon,knownas
the vehicle's transferfunction(orcabin
gain), plays an important role in shaping
thesubwoofer'sfrequency response in
your vehicle.
SUBWOOFER
ENCLOSURETYPES
Thesubwoofersare designed to perform
best in moderately sized sealed
enclosures, vented enclosures and
prefabricated band-pass enclosures,
Infinite-baffle mounting is possible, but
thesubwoofer's mechanical power
handling will bereduced because there
will be no volumeofairtostiffenthe
subwoofer's suspension andprevent
overexcursion. If you choose infinite-baf-
flemounting, consider the RMSand peak
power-handlingratingstobehalfof what
is listedinthespecifications in this
manual.
You should choose an enclosure type
based on theamountofcargo space you
can devotetothe enclosure, theamount
ofpower you will use todriveyour
subwoofer(s), and yourlisteninghabits,
SEALED ENCLOSURES
Theairtrappedinsidea sealed enclosure
is compressed whenthesubwoofermoves
rearward and israrefiedwhenthe
subwoofermovesforward.In both cases,
theair inside and outsidethebox will
seek equilibriumbypushingandpullingon
thesubwoofer cone. Theresult is a
stiffer suspension whencomparedtothe
subwooferoperating in free air.This
means that thesubwoofer's cone will be
hardertomoveatlow frequencies, a
conditionwhichprotectsthesubwoofer
from physical overexcursion, but
requiresmorepower than other designs
toachieveagivenacoustic output.
SEALED-ENCLOSURE PERFORMANCE
ADVANTAGES
•Thein-vehicleperformance will have
the flattest overallfrequency response,
•Thein-vehicle response will havethe
widestbandwidth.(Usablelow-frequency
response inside thevehicle will be
below 20Hz.)
•An optimum sealed enclosure will always
be smaller than an optimum enclosure of
anothertype.
SEALED-ENCLOSURE PERFORMANCE
TRADE-OFFS
•An optimum sealed enclosure will have
loweroverallefficiency than an
optimum enclosure ofanothertype,
•Asubwoofer in an
optimum sealed enclosure will require
moreamplifierpowertoachievea given
acoustic output than inan optimum
enclosure ofanothertype.
SEALED-ENCLOSURE CONSTRUCTION
Sealed-enclosure construction is straight-
forward and forgivingoferrors in volume
calculation, butair leaks should be
avoided. Use medium-densityfiberboard
(MDF),glue and screws toconstructthe
enclosure, and seal alljoints with silicone
caulk.
RECOMMENDATION
Subwoofersin sealed enclosures are
recommendedfor enthusiasts whoprefer
accurate music reproduction and flat
frequency response, forthosewhohavea
smaller space todevotetoa subwoofer
enclosure, and forthosewhohave plenty
ofamplifierpowerdevotedtodrivingthe
subwoofer.The sealed-enclosure design
indicatedinthismanualrepresentsthe
best compromisebetweenlow-frequency
extensionand flat response.
VENTED ENCLOSURES
A vented enclosure acts likea sealed
enclosure atfrequenciesaboveitstuned
(resonance)frequency.Atresonance
(which is defined by thevent),thevent
produces the majority of sound - the
subwoofer cone is nearlystationarywhile
theair inside theventvibrates.This
providesgreater mechanical power
handlingat and above resonance, but
reducedmechanicalpowerhandlingbelow
resonance, Since thesubwoofer cone and
voicecoil don't move much at resonance,
airflow across thevoicecoilisminimized
and thermal powerhandlingisreduced
slightlyat resonance.
Vented enclosures provide better
efficiency in the 40Hz — 60Hz range,at
theexpenseof sound output in thelowest
octave(below40Hz).The use ofan
infrasonic filter is recommended with
vented enclosures. An optimum vented
enclosure for a Series subwoofer is larger
than an optimum sealed enclosure,
VENTED-ENCLOSURE PERFORMANCE
ADVANTAGES
•An optimum ventedenclosurehas
greaterefficiency and higher output in
the 40Hz — BOHz range than an optimum
sealed enclosure.
•An optimum ventedenclosureprovidesa
greater sensation of bass than an
optimum sealed enclosure,
• A subwoofer in an optimum vented
enclosure will require less amplifier
powertoachieveagiven acoustic
output (down tothe enclosure's
resonance frequency)than in an
optimum sealed enclosure.
VENTED-ENCLOSURE PERFORMANCE
TRADE-OFFS
• Reduced output in thelowestoctave
(below40Hz).
• Reduced mechanicalpowerhandling
belowthe enclosure's resonance
frequency.The use of an electronic
infrasonic filter is stronglyrecommend-
ed toreducethe chance ofoverdriving
thesubwooferbelowthe enclosure's
resonance frequency,
•An optimum vented enclosure will
always belarger than an optimum
sealed enclosure.
VENTED-ENCLOSURE CONSTRUCTION
Vented-enclosureconstruction is more
difficult than theconstructionofa sealed
enclosure. The enclosure volume and port
dimensionshave a specific relationship
with the physical andelectromechanical
characteristics ofthesubwoofer,
requiring that therecommended
enclosure volume and port characteris-
tics bestrictly observed. As with sealed
enclosures, use medium-density
fiberboard(MDF),glue and screws to
construct the enclosure, and seal all
joints with silicone caulk,
RECOMMENDATION
Subwoofersinvented enclosures are
recommendedfor enthusiasts whoprefer
accentuated bass response, for those who
have plenty ofcargo space todevotetoa
subwoofer enclosure and forthosewho
will use a less powerful amplifiertodrive
theirsubwoofer. The volume and port
dimensionsindicatedmust be followed
precisely to ensure optimum
performance.
MOUNTING THE
SUBWOOFER
Thesubwoofers should be
mounted from theoutsideofthe
enclosure. Use theincluded foam
mounting gasketto ensure a leak-free
seal betweenthesubwoofer frame and
the enclosure,
CONNECTING THE
SUBWOOFER
SETTING THE IMPEDANCE
The Stadiumsubwoofers both feature
theSelectableSmart Impedance™
(SSI) switch.This exclusive feature lets
you setthesubwoofer'simpedanceto
either 2 ohms or4 ohms with the flip ofa
switch (seeillustrationsbelow).This
allows you toextractthemost from your
subwooferamplifier in anysituation.
The SSI 2-ohm setting increases the
subwoofer's output overthe 4-ohm
settingby up to 3dB, depending on the
amplifier. Performance is identicalinall
other respects. Iftheconnectedamplifier
is ratedfor 2-ohm operationandits 2-ohm
powerratingsare within thesubwoofer's
power-handling specifications, setting
the SSI switchinthe 2-ohm position will
achieve maximum output.
2-0hm Setting
4-0hm Setting
JBL
4Q 2Q
4Q 2Q

IMPORTANT: Make sure the
subwoofer amplifier is turned OFF before
setting theSSI switch. Donot change the
switch position while the subwoofer
amplifier is operating. Doing so could
damage the amplifier.
CONNECTING THE
AMPLIFIER
The subwoofer connectors are compatible
with bare or tinned wires. The
recommended wire gauge is between
14AWG and 8AWG, depending onthe length
ofthe wire run between the amplifier and
woofer. Heavier gauge wire is preferred
for runs over 6'(2m).
1 .Usea2.5mmhex driver to open the
connectors
Z.lnsert the wire ends into the connector
openings
NOTE: If using untinned bare wire, be sure that
no stray "+"and "-"strands touch each other,
Touching strands can cause a short-circuit,
which can damage your amplifier,
3.Use thehex driver to secure the wires inthe
connectors, as shown inthe illustration
tothe left
1. Usehex wrench to open connectors —
3.Usehex wrench to secure connectors
TECHNICAL DATA
Stadium 1024
THIELE-SMALL PARAMETERS
20. 40
VOICE-COIL DC RESISTANCE:
REVO (OHMS)... ....1.80
... 4.06
VOICE-COIL INDUCTANCE @ 1KHZ:
LEvc (MH) .... ....1.04
... 0.91
DRIVER RADIATING AREA:
SD(IN2)
... 53.69 .. 53.69
SD(CM2)
.. 346.36 . 346.36
MOTOR FORCE FACTOR: BL(T„) ...10.54 .. 14.98
COMPLIANCE VOLUME:
VAS(FT3)
.... 0.86 ... 0.89
VAS (LITERS) ... ... 24.22 .. 25.27
SUSPENSION COMPLIANCE:
CMS(MM/N)...
..144.00 . 150.00
MOVINGMASS,AIRLOAD: MMS
(GRAMS), , .
,. 188.72 . 185.47
FREE-AIR RESONANCE:
Fs (Hz) ... 30.56 .. 30.18
MECHANICAL Q:
QMS
.... 3.11
... 2.17
ELECTRICAL Q:
QES
....0.57
... 0.61
TOTAL Q:
QTS
....0.48 ... 0.48
MAGNETIC-GAP HEIGHT:
HAG (IN)
....0.39 ... 0.39
HAG (MM) ...10.00
.. 10.00
VOICE-COIL HEIGHT: Hvc(IN) ....1.32 ... 1.32
Hyc(MM)
... 33.50 .. 33.50
MAXIMUM EXCURSION:
XMAXON)
.... 0.47 ... 0.47
XMAX (MM)....
... 12.00 .. 12.00
(side view)
VB0X= 0.50ft3 (14.20 liters)
(side view)
VB0X= 0.75ft3 (21.20 liters)
VENTED-Box VOLUME (INCLUDES DRIVER/PORT DISPLACEMENTS) VENTED-BOX VOLUME (INCLUDES DRIVER/PORT DISPLACEMENTS)
(side view)
VB0X= 1.5ft3(42.5 liters)
diameter = 3"
76mm
(side view)
VB0X= 2.5ft3(70.8 liters)
diameter = 4"
102mm
SPECIFICATIONS SPECIFICATIONS
mounting height
3/4" (1! mm)
2. Insert wires
into connector
openings
Stadium 1224
THIELE-SMALL PARAMETERS 20 40
VOICE-COIL DC RESISTANCE:
REVC (OHMS)
1.82.... .... 4.07
VOICE-COIL INDUCTANCE @ 1KHZ:
LEVC (MH).
1.03.... .... 0.94
DRIVER RADIATING AREA: SD (IN2)— 82.29.... .... 82.29
SQ (CM2)... 530.93.... .. 530.93
MOTOR FORCE FACTOR: BL(TB) ... 11.70.... ... 16.99
COMPLIANCE VOLUME: VFLS
(FT3)...
1.93 .... 1.86
VAS (LITERS)
54.65.... ... 52.59
SUSPENSION COMPLIANCE:
CMSWN)
138.00.... .. 133.00
MOVINGMASS,AIRLOAD: MMS
(GRAMS)
220,58.... ,. 225.64
FREE-AIR RESONANCE:
FI(HZ) ... 28.84....
... 29.07
MECHANICAL Q:
QMS
4.29....
.... 2.56
ELECTRICAL Q:
QES
0.53.... .... 0.58
TOTAL Q:
QTS
0.47.... .... 0.47
MAGNETIC-GAP HEIGHT:
HAG ON)...
0.39.... .... 0.39
HAG(MM).. 10.00....
... 10.00
VOICE-COIL HEIGHT: Hvc
(IN) . •.
1.32.... .... 1.32
Hvc(MM).. 33.50....
... 33.50
MAXIMUM EXCURSION:
XMAX(IN)..
0.47.... .... 0.47
XMAX(MM)• 12.00....
... 12.00
SEALED-BOX VOLUME (INCLUDES DRIVER DISPLACEMENT) SEALED-BOX VOLUME (INCLUDES DRIVER DISPLACEMENT)
length =11.3"
1287mm
Port
fB= 30.0Hz
length = 11.7"
1298mm
Port
fB= 30.0Hz
DIMENSIONS:
mounting depth
6-15/16" (175mm)
cutout diameter
9-7/16" (239mm)
outerdiameter
11" (279mm)
DIAMETER: 10" (254MM)
SENSITIVITY (2.83V @ 1M): 91dB
POWER HANDLING:
450Wrms (1350W PEAK)
FREQUENCY RESPONSE: 30Hz~175Hz
NOMINAL IMPEDANCE: 2
OR 4 OHMS
VOICE-COIL DIAMETER: 21/2" (63MM)
DIAMETER: 12" (305MM)
SENSITIVITY (2.83V @ 1M): 92dB
POWER HANDLING:
500Wrms (1500WPEAK)
FREQUENCY RESPONSE: 25Hz~175Hz
NOMINAL IMPEDANCE: 2
OR 4 OHMS
VOICE-COIL DIAMETER: 21/2" (63MM)
DIMENSIONS:
mounting depth
7" (177mm)
cutout diameter
11-1/8" (282mm)
outerdiameter
12-13/16'(324mm)
mounting height
3/4"(18mm)
HARMAN
HARMANInternational Industries, Inc.
8500 Balboa Boulevard, Northridge,
CA91329 USA
www.jbl.com
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