JBL Portable Speaker M9500 User Manual

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M9500  
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System Setup  
The M9500 systems are modular, each consisting of a stack of  
three separate enclosures. The larger of the bass enclosures  
are placed at the bottom, and the high-frequency/horn modules  
stack on top and are aligned by the screws that protrude on  
the bass section. The smaller bass modules are placed on top  
of the high-frequency modules and are similarly aligned.  
We recommend that you do not assemble the M9500 systems  
until you have determined their best location in your listening  
room or control room. In general, the listening angle for best  
stereo imaging should be in the range from 45 to 60 degrees  
and the loudspeakers should be placed no closer than about 25  
or 30 cm (10" or 12") from the wall behind them. Sidewalls  
s hould be s om e w hat farthe r aw ay, and the louds pe ake rs  
should be toed inward toward the primary listening position.  
The room itself should be quiet, well-damped, and free of  
obvious flutter echoes or standing waves.  
Figure 1. Electronic hookup  
options; views of the rear  
panel of the dividing  
network. A, single full-range  
amplification; B, bi-wiring  
with two amplifiers; C, tri-  
wiring with three amplifiers;  
and D, biamplification with  
external electronic dividing  
network and separate high-  
and low-frequency  
Connect the loudspeakers to the networks using the cables  
provide d. Note that the re are diffe re nt cable s for high-  
fre que ncy and low -fre que ncy hookup; the y cannot be  
inte rm ixe d. For pos itive contact, ins e rt the Spe akon®  
connectors and turn them one-eighth turn clockwise.  
amplifiers.  
A
HF  
Biamp  
Norm  
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0
Electronic Options  
R
Your next concern is the amplifier/ loudspeaker operating mode.  
The various hookup options are shown in Figure 1. We will  
describe each of these options:  
HF  
B
R
B
R
B
LF1  
Option A, single full-range am plifier. This mode of operation  
requires a relatively large, high-quality amplifier capable of  
delivering up to 800 watts per channel into 4-ohms. Note that  
all sections of the network are connected in parallel with the  
straps provided.  
Input  
LF2  
I
B
HF  
Biamp  
+
0
Norm  
R
Option B, bi-w iring. In this mode, identical power amplifier  
sections are fed full-range program; one amplifier is connected  
to the high-frequency portion of the system, and the other is  
fed to the low frequency sections in parallel. Many users will  
us e a large s te re o am plifie r to drive the low - fre que ncy  
sections and a smaller one for the high-frequency sections.  
Make sure that the stereo amplifier used for the paralleled  
low-frequency sections can deliver the necessary power into  
4 ohms.  
HF  
B
R
B
R
B
LF1  
LF2  
Input  
C
HF  
Biamp  
Norm  
+
0
R
B
HF  
Option C, tri-w iring. This mode of operation is similar to B,  
but w ith e ach low -fre que ncy s e ction drive n by its ow n  
amplifier. In this case, each low-frequency amplifier section will  
look into 8 ohms.  
R
B
LF1  
LF2  
R
B
Input  
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R
D
LF1  
Option D, biam plification. This mode of operation requires a  
dedicated electronic dividing network crossing over aBt 650 Hz.  
HF  
Biamp  
+
0
R
Norm  
R
LF2  
We recommend the JBL DX-1 with internal compensation  
B
made for the M9500 system. If this modeInipsut used, make sure  
HF  
B
R
B
R
B
that the screwdriver adjustment on the back of each network  
LF1  
is set in the “biamp” position.  
HF out  
Electronic dividing  
network  
Input  
High-fre que ncy trim s w itche s on the  
back of the networks provide three set-  
LF2  
(650 Hz crossover)  
LF out  
tings (ze ro, plus , and m inus ) s o that the s ys te m s can be  
trimmed for the acoustical characteristics of the listening  
space.  
Regardless of the operating mode you choose, we recommend  
that only the finest hookup wire be used between the ampli-  
ers and dividing networks. We recommend that the wire size  
be no smaller than 3.3 square millimeter cross-section (#12  
AWG). The inputs to the networks can accommodate spade  
lugs, pins, bare wire, or individual banana connectors.  
The internal 9-volt battery that is used to bias the capacitors  
will normally last at least 5 years. You may test it by pressing  
the gold logo on the front of the network. If the LED on the  
front of the network illuminates, the battery is functional and  
need not be replaced.  
Front cover  
Diecast aluminum housing  
The  
Transducers  
Figure 2. Cutaway view of  
JBL 475Nd high-frequency  
compression driver. Note  
the curved (equalized) paths  
from the diaphragm to the  
driver's output.  
Silver plated pole piece  
Serpentine phone plug  
Aquaplas-dusted  
titanium diaphragm  
Foam acoustic pad  
Top plate  
Neodymium magnet  
Return circuit  
Screen  
Threaded mounting holes  
Throat  
Aluminum shorted turn  
Figure 3. Cutaway view of  
JBL 1400Nd low-frequency  
transducer. Note both  
aluminum and copper  
shorting rings.  
Copper shorted turn  
Cooling vent (1of 3)  
Neodymium magnet  
Return circuit  
Edgewood aluminum  
ribbon voice coil  
Centering spider  
Diecast frame/  
magnet chassis  
Fiberglas/Aquaplas  
composite cone  
Foam compliance  
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The JBL model 475Nd compression driver used in the M9500  
has a smooth titanium dome 101 millimeters in diameter that  
has been lightly coated with Aquaplas™ damping compound.  
Its aluminum ribbon voice coil operates in a magnetic flux field  
of 1.65 tesla (16,500 gauss). Mid-band efficiency is 20% , while  
at the peak value of driver impedance it is in excess of 50% .  
The driver uses JBL’s Coherent Wave™ phasing plug, which  
provide s e qualize d path le ngths from all s e ctions of the  
diaphragm to the driver's output. The driver is mounted on the  
H9500 horn, a design used only in this system that provides  
s m ooth loading dow n to 500 Hz and e xhibits cons is te nt  
horizontal dispersion over its operating range.  
There are two JBL model 1400Nd low-frequency transducers  
in e ach louds pe ake r s ys te m . A s ingle 1400Nd is capable  
of handling ins tantane ous input s ignals of 600 w atts ,  
corresponding to a midband peak output of 118 dB Lp at a  
distance of one meter. The transducers second and third  
harmonic distortion have been reduced through the use of  
JBL’s traditional aluminum shorting ring at the base of the pole  
piece, as well as through the use of a copper shorting ring on  
the top plate adjacent to the voice coil. The transducers make  
us e of J BL’s Ve nte d Gap Cooling™ in w hich force d air,  
generated by cone motion, removes heat produced by the  
voice coil. Each driver is mounted in its own ported enclosure,  
and the tw o e nclos ure s are “ s tagge r tune d” to provide  
smoother and more extended low-frequency response.  
Cutaw ay vie w s of the high-fre que ncy and low -fre que ncy  
transducers are shown in Figures 2 and 3.  
Typical System Perform ance Measurem ents  
The high-frequency response of the M9500 system was care-  
fully established by making a series of measurements over  
frontal angles of 60° in both vertical and horizontal planes. This  
allows for optimal listening over a wide area. The frequency  
response averaged over the 60° horizontal and vertical angles,  
measured from 200 Hz to 20 kHz, is shown in Figure 4. Here,  
the network High Frequency trim is set in its zero position.  
The s light dow nw ard tre nd w as incorporate d, bas e d on  
e xte ns ive lis te ning te s ts to conte m porary pop/rock and  
classical recordings.  
+10  
Figure 4. Averaged frontal  
angle response (60°,  
horizontal and vertical) of  
M9500 from 200 Hz to 20  
kHz.  
dB  
0
–10  
–20  
–30  
1.5  
2
3
4
5
6
7
8
9
2
3
4
5
6
7
8
910  
100  
10  
1.5  
2
3
4
5
6
7
8 9 10  
10000  
1.5  
2
1000  
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The directivity index (DI) of the H9500 horn is shown in Figure  
5. The smoothly rising DI is a consequence of the gradual  
narrowing of the vertical dispersion angle above 2 kHz and  
contribute s to the ove rall flatne s s of the high-fre que ncy  
response of the system.  
20  
100  
Figure 5. Plot directivity  
index (DI) and directivity  
factor (Q) of the H9500.  
10  
0
10  
1
20  
50  
100  
200  
500  
1000  
2000  
5000  
10000 20000  
Frequency (Hz)  
Overall system on-axis pressure response and impedance are  
shown in Figure 6. The contributions of the paralleled low-  
frequency sections and the high-frequency section are shown  
individually along with their acoustical summation. The overall  
slopes in the crossover region are a combination of electrical  
(network) and acoustical response.  
M9500  
4.3V @ 1.5 m  
HF @ "0"  
Figure 6. On-axis response  
of M9500. Individual  
100dB  
Anecmoil  
contributions of paralleled  
low-frequency transducers  
and high-frequency section  
are shown, along with their  
summation. The impedance  
curve is also given, showing  
a minimum value of 3 ohms  
in the 100 Hz range.  
Ground  
Plane  
10  
1.5  
2
3
4
5
6
7
8
9
10  
1000  
2
3
4
5
6
7 8 910  
100  
1.5  
2
3
4
5
6
7
8 910  
10000  
1.5  
2
The second and third harmonic distortion of the system is  
shown in Figure 7. Here, the system is driven with sine wave  
input to produce an output of 96 dB Lp at a distance of 1  
meter. An output of 96 dB with a sine wave input corresponds  
to extremely high system output with wide band program  
material. Distortion curves have been raised 20 dB, and the val-  
ues seen here lie well below 1% for the lowest frequencies up  
to 4.5 khz, reaching a value of only 1.6% at 10 kHz. Not many  
loudspeakers can demonstrate such low levels of distortion as  
shown here.  
Figure 7. Second and third  
harmonic distortion for  
fundamental of 96 dB Lp at  
a distance of 1 meter.  
96dB  
Distortion Raised 20dB  
Solid = Second Harm.  
Dash = Third Harm.  
M9500  
Distortion  
3.0V @ 1 m  
(Distortion raised 20 dB)  
1.5  
2
3
4
5
6
7
8
9
1000  
2
3
4
5
6
7 8 910  
100  
10  
1.5  
2
3
4
5
6
7
8 910  
10000  
1.5  
2
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Care and Maintenance of the System  
Your M9500 monitors should give years of trouble-free service.  
Normally, the only routine maintenance will be cleaning. The  
grilles may be cleaned of dust gently with a vacuum cleaner  
using a brush attachment. If there should be stains on the  
grille, a soft bristle brush moistened with a dilute mixture of  
water and dishwashing detergent may be used. The same  
mixture may be used for cleaning the enclosure finish itself  
if it has become smudged.  
As mentioned before, the 9-volt batteries in the dividing net-  
works will last perhaps as long as their normal shelf life. You  
may expect them to last at least 5 years. If the LED no longer  
lights, remove the acrylic door on the front of the network and  
replace them.  
System Specifications  
Acoustic and Electrical Specifications:  
Sensitivity:  
95 dB for 2.83 V @ 1 meter  
Rated Impedance (LF parallel):4 Ohms  
Minimum Impedance:  
Frequency Response:  
Crossover Frequency:  
System Polarity:  
3.0 Ohms @ 100 Hz  
35 Hz to 20 kHz (half space)  
650 Hz  
EIA (positive voltage to red terminal  
produced outward cone motion)  
System Com ponents and Physical Specifications:  
Low-Frequency Transducer: 1400 Nd  
High-Frequency Transducer: 475 Nd  
Horn Assembly:  
H9500  
N9500  
Dividing Network:  
Enclosure Volumes:  
78 liters (2.8 cu ft) 35 Hz tuning (upper LF)  
115 liters (4.1 cu ft) 28 Hz tuning (lower LF)  
System Dimensions:  
140 mm H x 330 mm W x 403 mm D  
(55"H x 15.13"W x 15.88"D)  
Total depth including horn 521 mm (20.5")  
Weight:  
38.2 kg (84 lbs) upper LF  
54.5 kg (120 lbs) lower LF  
37.3 kg (82 lbs) horn assembly  
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JBL continually strives to improve its products. New materials, produc-  
tion methods and design refinements are introduced into existing  
models without notice as a routine expression of our design philosophy.  
For this reason, JBL M9500 Series Loudspeakers may differ in some  
respect from their published specifications and descriptions, but will  
always equal or exceed the original specifications unless otherwise  
stated.  
JBL Consumer Products, Inc.  
80 Crossways Park West  
Woodbury, NY 11797  
8500 Balboa Blvd.  
Northridge, CA 91329  
800 645 7484  
Printed in USA on recycled paper 9/95  
Part No. JBLM9500M  
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