PROFESSIONAL SERIES
FEATURES: output, attaining in many applications those levels
normally associated with compression driver mon-
Frequency Range ( - 6 dB): 35 Hz-27 kHz itor systems. Smooth power response and controlled
dispersion are also characteristic of the 44 12.
Frequency Response (f 2 dB): 45 Hz-20 kHz Optimum enclosure porting and careful network
Sensitivity: 90 dB SPL, 1 W (2.83 V), I m design ensure smooth response, which extends well
into the bottom musical octave. Response to 27 kHz
Power Rating: 150 watts, pink noise ensures that the upper musical octave ( 10 kHz to
Transducer Complement: 20 kHz1 will be reproduced with complete accuracy,
300 mm ( 12 in)LF, Aquaplas laminate cone thus making the 44 12 ideal for monitoring critical
125 mm (5 in) midrange felted paper cone digital and advanced analog recordings.
25 mm (1 in) HF, pure titanium dome
The 44 12 is a three-way monitor system designed
for demanding recording and broadcast applica-
b tions. It is oriented horizontally so that it can be
easily integrated into control room architecture, or
mounted on the console itself. It is provided in mir-
ror-imaged pairs for accurate stereophonic imaging.
The 44 12 is capable of remarkably high acoustical
>
HIGH FREQUENCY High quality polypropylene and polystyrene
capacitors are utilized as “bypass capacitors” in par-
DOME RADIATOR allel with the larger network mylar capacitors. This
Pure titanium was first used by JBL in the design of design procedure linearizes energy storage in the
diaphragms for high frequency compression drivers. larger capacitors, and the result is greater accuracy in
Recently, JBL has perfected a 25 mm titanium dome the reproduction of transient signals.
radiator which is capable of 30 watts power handling Front baffle controls allow precise adjustment of
and can reproduce the frequency range from 3 kHz to mid and high frequency transducer levels, enabling
27 kHz. The unique “diamond surround” and ribbed the system to be adjusted to taste, or to match a
dome structure of the model 035Ti HF unit provide given acoustical environment.
control over secondary resonances, yielding abso-
lutely flat axial response to the normal upper limits SPECIFICATIONS:
of today’s recording media. With a basic sensitivity of
92 dB, one watt at one meter, the 035Ti transducer Frequency Range (-6 dB): 35 Hz-27 kHz
exhibits virtually no dynamic compression. Frequency Response (* 2 de): 45 Hz-20 kHz
Power Rating’: 150 watts
MIDRANGE DRIVER Sensitivity: 90 dB SPL. 1watt (2.83 V) at I meter
Nominal Impedance: 8 ohms
The 125 mm (5 in) midrange driver used in the Crossover Frequency: 800 Hz and 4.5 kHz
4412 monitor has a 25 mm ( I in) copper voice coil. LOW FREQUENCY TRANSDUCER:
The cone is made of felted paper with a special Nominal Diameter: 300 mm (I 2 in)
Voice Coil: 75 mm (12 in) diameter copper ribbon
damping treatment to ensure smooth response. The
Magnetic Assembly Weight: 4.6 kg (10.25 lb)
basic sensitivity of the transducer is 94 dB, one watt
Flux Density 1.08 tesla (10.800 gauss)
at one meter, ensuring minimal dynamic compres-
Sensitivity’: 91 dB SPL. 2.83 Vat I m (3.3 ft)
sion at high acoustical output levels. MID RANGE DRIVER:
Nominal Diameter: 125 mm (5 in)
LOW FREQUENCY DRIVER Voice Coil: 25 mm (I in) diameter copper
Magnetic Assembly Weight: 0.74 kg (I .63 lb)
The 300 mm ( 12 in) diameter LF driver has a felted Flux Density: 1.25 tesla (I 2,500 gauss)
paper cone laminated with Aquaplas for smoothness Sensitivity: 94 dB SPL, 2.83 Vat I m (3.3 ft)
in the upper range of its response. The voice coil is HIGH FREQUENCY DOME RADIATOR:
75 mm (3 in) in diameter, and it is made of edge Nominal Diameter: 25 mm (I in)
wound copper ribbon. Linearity of the LF driver is Voice Coil: 25 mm (I in) diameter copper
the result of careful attention to mechanical suspen- Magnetic Assembly Weight: 0.91 kg (2 lb)
Flux Density: I.5 tesla (I 5,000 gauss)
sions as well as Symmetrical Field Geometry (SFG).
Sensitivity? 92 dB SPL. (2.83 V) at I m (3.3 ft)
SFG reduces harmonic distortion by producing
GENERAL:
identical magnetic flux fields on each side of the
Finish: oiled walnut
magnetic gap. This ensures that the voice coil will Grille Color: dark blue
intersect equal flux lines for both positive and nega- Dimensions: 362 mm x 597 mm x 286 mm deep
tive excursions of the cone. A flux stalilizing ring (14tiinx23%inxII%indeep)
placed around the pole piece reduces the effects of Weight (each): 21 kg (47 lb)
magnetic flux field modulation. Overall, SFG reduces Shipping Weight (each): 24 kg (53 lb)
‘Ratingbased on test signal of filtered random noiseconforming to international standard IEC 26&
distortion to about one-tenth the value found in 5 (pink noise with I2 dB/octaverolloffbelow 40 Hz and above 5000 Hz with a peak-to-average ratio
conventional magnetic structures. of 6 dB), two hours duration.
2Averaged from IO0 Hz to 500 Hz within I dB
A cast aluminum frame ensures mechanical 3Averaged above 3 kHz within I dB
integrity under the most demanding operating
conditions.
DIVIDING NETWORK
The complex network design produces a seamless
system frequency response through the critical
crossover regions at 800 Hz and 4.5 kHz. The rolloff
slopes are precisely determined to result in smooth
axial and power response.
Frequency Response, 1 Wat I m; impedance Beamwidth ( - 6 dB) vs. Frequency
Directivity (DI and Q) vs. Frequency Phase Response vs. Frequency, 200 Hz to 22 kHz; vertical
divisions at 45 degrees. Note that the phase response of the
system is well within 270 degrees over the frequency range
shown
Horizontal Off-axis Response vs. Frequency ( - 3, - 6, - 9, and Vertical Off-axis Response vs. Frequency ( - 3, - 6, - 9, and
- I2 dB contours) - 12 dB contours)
Energy-Time Curve (time span, 0 to 18,304 microseconds; Time-Energy-Frequency (TEF) Curves (250 Hz to 20 kHz) Front-
vertical divisions 6 dB; loudspeaker placed one meter from back span is from 6500 microseconds to 3028 microseconds;
microphone) Note that the bulk of the loudspeaker’s energy vertical divisions 6 dB. Note the smooth decay of the system and
arrives at the microphone coherently. high frequency extension beyond 20 kHz.
Mid Frequency Control Range High Frequency Control Range
Distortion vs. Frequency, IO watts (distortion raised 20 dB) Power Compression, at 85,95, and 105 dB, one meter
IBL contmually engages m research related to product unprovement New materials productmn
methods and design refmements are Introduced mto enstmg products wthout notIce as a routme
express,on of that philosophy For this reason any current IBL product may differ I” some respect
from Its publehed descrlptlon but wll always equal or exceed the or~gmal design speclflcatmns
unless othetwse stated
66989 SS4412 P821 25M 2107
JBL ProfessIonal, 8500 Balboa Boulevard, P.O. Box 2200, Northridge, California 91329 U.S.A.
