Jbl 2245 h brochure

Page 1

Professional Series

mm 118 ml
LOW _FRE__QUENCY
LOUDSPEAKER

FEATURES:

600 W continuous program power capacity

IOO mm (4 in) edgewound copper ribbon voice coil
20 Hz-ZkHz response

95 dB sensitivity, i W, | m

The JBL Model 2245H is a professional quality low
frequency transducer designed for use in custom
studio monitors or other applications requiring high
sensitivity and power capacity, as well as extremely
low distortion and extended bass response.

To achieve this performance, the 2245H incor-
porates a new die-cast aluminum frame, integrally
stiffened cone with foam surround, |00 mm 14 inl
diameter edgewound copper ribbon voice coil, and
individually machined magnetic pole piece and
back plate. Additionally, the cone is coated with an

exclusive damping formulation to ensure optimum
mass and density.

The 2245H also features a large, high flux. Symmet-
rical Field Geometry (SFGi magnetic structure. The
SFG design, in combination with a Flux Stabilizing
Ring around the pole piece, significantly reduces
second harmonic distortion and provides exception-
ally accurate low frequency reproduction. This motor
assembly is optimally balanced with a 25 mm ii in)
long voice coil and carefully engineered suspension
elements to allow maximum excursion linearity with
complete freedom from dynamic instabilities.

Page 2

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ARCHITECTURAL SPECIFICATIONS:

The low lrequenty tmnsdmer shall have a nominal diameter ol loll mrn l ill Ini, overall depth
not greater than m mm r7i/t "IL and weigh at least I3!) kg rm ibi The trarrie shall be all cast
aluminum to resist delormarion and the magnetic assembly shall utilize i lemte magnet and
produce a symmetrical magnetic held at the voice coil gap In addition. a Flux Stablliling Ring
encircling the pole niece shall act to reduce llux modulation The voice (Oil shall be IOU mm 14 mi
in diameter and shall a: made ol edgewuund copper ribbon operating In a magnetic Ileld oi not
less than I 22 T l 100 gaussl

Performance SDeflIlCfltlons ol a typiral production unit shall be as lollnws Measured sensrtlv~
iry lSPLat i min in with | w Inputi sweat loo Hpsou le shall be at leasr95 as on axis As an
indication of eleummechaniral conversion CHIEIEHCY. the BI tartar shall be at least Zl newtons
per ampere The hall-space relerence efiicieney shall be 1,? Usable lrequency response shall
extend Item 10 H1~2 kHl. Onxaxis response, measured at a distance ol 2 In lb 0 Itl or more under
Ireelleld conditions, shall be : 3 dB Imm 40 H1~800 Hl ALOHSIIE loading shall lurtherextend the
low Irequency response, Nominal impedance shall be 8 ohms Rated Dower capactty shall be at
least boa w normal Dmram material

The transducer shall be the IBL Model 124591 Other laudspealiers will be constdered Ior
equtvalency provided that submitted data from a reeognlled independent test laboratory verily
that the above performance speculations are met

Typical Response Curve, Enclosure Volume and Port Tuning
~20

20

20

ion ireouenty in m r000 r0000

Frequency response contour of the 224SH taken in a hemispherical free-
lield environment, a closed box of 280 L 1 l0 lti internal volume enclos-
ing the rearof the driver Measured response of a typical production unit
including all peaks and dips. does not deviate more than 2 dB trorn the
above curve. The dashed curve represents the response from a 320 cm
150 inli port with a 20 cm (8 ini long duct tuning this enclosure to 30 Hz.

IBL C(Wtinuallv engages in researm related iu product improvement New materian productio"
methods anc tiesien relrnerrients are inrrouuced into existrng DtolluLtswitnoilt nGtKE as a routine
expression at trat nmirmiriin m in's reason anv Current lbl. Drooutt mar. Jirrsr ii" m mt- respect
liom Ils puolisnea ue unless otherwise stated

{JBL

JBL Prolessronal. 8500 Balboa Boulevard PO. Box 2200, Northridge California 91329 U SA

\JI
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F d

SPECIFICATIONS:

460 min I I8 Ini
Bonms
(>00 W continuous program

Nominal Diameter
Rated Impedance
Power Capacit.

Sensmvrtv 95 dB SPL I W Im
Frequencv Range 20 Hz-Z kHz
Highest Recommended
Crossover Freuuencv 800 Hz

Recommended Enclosure

Volume 225-450 L IS- 16 W!

ElIeCthe Piston Diameter 406 mm (10 mi

Maximum Excursion

Before Damage 25 mm i I in peak to peaki
7 I ohms : 10% (a 25°C

|00rnmi4inl

Minimum Impedance
Voice Cori Diameter

Voice Coil Material Edgewound Copper Ribbon

\oiceCoilWinorng Depth 24 mmlDQaini
Magnetic Gap Depth 9mm i0 35 rnr
Magnetic Assembi» Weieh: Q I k: (20 lbi
Flux Densm 122 T i I2 200 eaussi
Bl Factor 2| N A
Ellective Mmrne Mass 0 H35 k2

Posrtiie voltage on BLACK terminal EIVES iorwarri diaphragm motion
Tr-reié-Smali Parameters

l\ 20 Hz
Re 5230th
(its 027
0mg 22
Des 0 3i
Va5 320 Li29itr

SD OIXOmIlZOOIni

Xmax 95 mm [Va inl
VD |.230Cml7$lni
Lt i4mH

n rhiili suiiKEr 2 l r

PB iMaxi £00 \A CdrIIInUOUS Sine Wave

MOUIIIIITE inrrrmatron

Overall Diameter 464 mm ilEi inl

Boltfiirile Diameter MI mmll7xini

Hallie kutout Diameter
Front Mount 427 rrirnllo"'i»inr

Rear Mount 4.72 mm rlo i inr

miurne DISDldLeC 0. Driver

when \IOunten in Entiosure ll 5 L l0? lti
Nei\\eiunt llokgilolhi
htiiDDiTiS Weight l45kg432|bi

\oritinuoa- Dmeraln [ii v. ' \ JEIlncu as it! greater than Comma-LU) ~ine mate power and Is .1
gunsehdlhs expressiir ( w lransuwer s dbllih to nanilie t\'pltal 3mm arr: musrr program
marermi

rTne sensitivitv rating t 1 Hit ism rrtuuinct iiiuuspeaxtrs Is based on a sienai (wept rrorn Iiifl Hit
00 a'rrt-r tnun Ent _\ irriinrial l kHz single Irsqutnn test siEnu \inti- Mes? drivers ar
.lsuailt nixed bell) NW H 'l'iereiurc MSBDIESCHSIIIHH or me 2149i Na'. DE sunstantiaiii areatt
than trar (l irutlspeaAe , ilr m: it publisnea ratlriE

SSZZSH 15M 10 88 63369 Printed in U S