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Musical Instrument Loudspeakers
The new JBL MI Series Loudspeakers are engineered with the latest
advances in transducer design and
technologies to give you response that
is flat and even . . . in tune with the
sound of the 80’s. They let you add the
color you want. And, they give you the
satisfaction of knowing you’re using
the world’s most popular line of speakers for producing your music.
A careful evaluation of the Ml Series
proves they give you a lot more. The
frames are die cast.. . not cheap
stamped baskets. A die cast frame
provides a better heat-sink allowing
greater power handling and because a
die cast frame can’t flex, it reduces
resonances from the frame.
JBL ribbon-wire voice coil.
Syfrmefncal
magnet/c held
_ _
mmefncal
magnehc
.
Cross-sections of JBL (left) and conventional magnetic structures.
The voice coils are fabricated from
special wire that has been milled into a
flat ribbon. Flat wire can be wound
more tightly than round wire, putting
more conductor (wire) in the gap. The
design is more efficient and more
rugged.
The voice coils are precision flat
wound, in four layers with staggered
seams. This construction is physically
very strong and resists deformation
from heat. The result is greater efficiency and increased power handling.
The Ml Series loudspeakers feature
JBL Symmetrical Field Geometry
(SFG) magnetic structure, a design
that contributes to the clean sound.
Typical magnetic structures, with nonsymmetrical magnetic fields, add
significant amounts of distortion
because of the nonlinear pull such a
field exerts on the voice coil. (See
illustration).
If you’re looking for a speaker that
will let you produce today’s music, listen to the Ml Series at your JBL dealer.
The Ml Series loudspeakers are available in lo”, 12” and 15” models. Their
efficiency and power capacity are
greater than many extended range
speakers in their size ranges.. giving
you outstanding dynamic range and
extremely high accuracy. Use the Ml
Series speakers for your guitar, keyboard, or P.A. system. They directly
replace conventional speakers used in
guitar amplifiers, organs, electric pianos, or other applications.
Combine the new Ml Series loudspeakers with all new cabinet designs
and JBL expertise in system design
and you have the all new Ml Series
Component Systems.
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MI Series Loucheakers and Svstems
JBL MI Series Features
Flat-Front Bi-Radial Horn/Titanium
L’
Diaphragm Compression Driver
Specifically designed for the MI
Series Compact Sound Reinforce-
ment System to provide excellent on-
and off-axis frequency response in the
horizontal plane. It has 90” horizontal x
40” vertical nominal coverage, with
uniform on- and off-axis frequency
response in the horizontal plane from
630 Hz to beyond 16 kHz. The high
frequency driver features a titanium
diaphragm with JBL’s patented diamond-pattern surround. The exceptionally high stress limit of titanium
together with the stronger surround
allows this design to achieve the performance of more expensive and fragile exotic materials. The driver uses a
high energy strontium ferrite magnet
for maximum efficiency and extended
response
Composite %-octave polar responses of a flat
front Bi-Radial horn from 800 Hz-16 kHz in the
horizontal plane.
MI-631 -
JBL’s titanium-diamond diaphragm combines
performance with reliability
Frequency Dividing Network
The frequency dividing network
used in the MI Series Compact Sound
Reinforcement System uses the high-
est quality electronic components-
non-inductive, non-polarized mylar
capacitors and air-core inductors and
are tailored to optimize the crossover
response.
MI Series
Component Systems
The Ml Series Component Systems
are the easy, professional way to give
your audience the sound they
deserve.
Newly engineered for music re-
production and general sound rein-
forcement in small to moderate sized
rooms. The systems feature JBL’s
specially designed flat-front Bi-Radial
horn and compression driver mounted
flush in the cabinet to eliminate the
problems of midrange narrowing and
high frequency beaming associated
with conventional horn designs. The
directional baffle enclosure increases
directivity for greater mid-range
punch, and low-frequency venting
extends bass response and lowers
distortion.
The cabinets are optimally tuned
enclosures engineered specifically for
each intended application.
And, they’re built to take the rigors of
the road. The cabinets are constructed
with a new wrap-and-fold technology,
using a high density wood-resin compound for maximum strength and are
covered with durable industrial-grade,
reinforced pebble grained material.
Corners are protected with heavy
hi-632~ -
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gauge metal.. . professional, recessed
road handles lock in place to prevent
unwanted vibration and noise during a
performance.. . input and output jacks
are recessed for protection. Naturally,
the drivers are protected by a heavy
mesh screen.
Audition the JBL Ml Series Systems
at your JBL dealer. . . their flexibility
makes them ideal for most of your
sound reinforcement applications.
MI-630
Vocal Reinforcement
System
Newly designed for vocal reinforcement and general music reproduction
in small to moderate sized rooms. The
Model MI-630 and Ml-634 include integral
mounting hardware for use with the tubular
aluminum tripod stand, Model MT-4612.
MI-630 features the patented JBL flatfront Bi-Radial’” horn and compression driver mounted flush in the cabinet to eliminate the problems of
midrange narrowing and high frequency beaming associated with
conventional horn designs.
MI-631 Stage Monitor
Smooth, wide frequency response
(60 Hz-l 5 kHz), uncolored reproduction, and high directivity make this an
ideal stage monitor, acoustic instrument system or even a small general
purpose vocal reinforcement system.
The system uses the Ml Series 12 inch
loudspeaker and flat front Bi-Radial’”
horn and compression driver.
MI-632A Horn-Loaded Sound
System
The MI-632A is a newly re-designed
system and features the new Ml-l 5A
380 mm (15”) woofer with its copper
ribbon voice coil, giving the MI-632A
balanced bass with a smooth and controlled sound. A three-position HF
level control switch allows precise tailoring of the tonal balance between
horn and woofer.
Model Ml-634 Direct-Radiator
Sound System
The Ml-634 Direct-Radiator Sound
System is a newly designed vented
enclosure system using the JBL FlatFront Bi-Radial’” horn and compression driver and the new Ml-l 5A 380
mm (15”) low frequency driver to provide smooth, uncolored response and
wide bandwidth with bass response
down to 50 Hz and high-frequency
response to 20 kHz. The smooth,
natural sound of the Ml-634 makes it
ideal for vocal and acoustical instrument reinforcement and general
sound amplification in small to moderate sized rooms.
MI-291 High Frequency Power Pack
The MI-291 System offers the JBL
Flat-Front Bi-Radial’” horn and
compression driver as a separate addon system which allows simple instal-
lation to existing systems.
MI-ZY
I
I
MI-W4 -
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MI Series Specifications
MI Series Loudspeaker Specifications
Specifications
MI-l0
MI-1 2
MI-15A
Nommal Diameter
250mm
300mm
380mm
10 in
12 I” 15 I”
Nominal Impedance
00_ 8R
0R
Power Capacbty
AES or EIA Shaped Noise
150 W
150 W
150 W
Sensitivity * 1 W @ 1 m (3.3 ft)
98 dB SPL
100 dB SPL 102 dB SPL
Frequency Range
70-8000 Hz
60-7000 Hz 40-6000 Hz
Voice Coil Drameter
51 mm
51mm
51 mm
2 in
2 I” 2 I”
Votce Co11 Matenal
-Alumrnum Rrbbon -
Copper Rrbbon
Magnetrc Assembly Werght
2.5 kg
2.5 kg 2.5 kg
5% Ibs. 5% Ibs.
5% Ibs.
Flux Density
1.05 tesla
1.05 tesla 1.05 tesla
(10,500 gauss)
(10,500 gauss)
(10,500 gauss)
Frame Material
Baffle Cutout Diameter
Diecast Aluminum
Front or Rear Mount
Depth
Net Wetght
22t3mm
281mm
9 I”
11-1161”
116mm
137mm
4% I”
5% I”
2.7 kq
3 ka
6 Ibs: 6%-lbs.
*Sensitivity measured
with an input averaged from 500
Hz to
2.5 kHz
351mm
13-13116
in
162mm
6% in
3.2 ko
7 Ibs:
Thiele-Small Parameters
Ml-l 0
Ml-l 2
MI-15A
f,
W-4
75
65
40
R, (ohms)
5.6
5.6
5.6
Qts
.33
.46
0.42
Qms
1.8
2.2
2.8
Qes
0.41
0.58
0.49
vas (L)
35
75
270
(cu ft)
1.25
2.7
9.6
Sn (m*)
,034
,055
089
-
(in’)
52.5
85.5
138
Xmax (mm)
3
3
4
(In)
.12
.12
0.16
VD (cm?
100
165
356
(in3)
6.0
10.1
21.8
f-e (mH)
0.6
0.6
0.8
~0 (Half space)
(%) 3.5
3.5
3.5
MI Series Component System Specifications
Frequency
Power Capacity
Range (Continuous
Sensitivity’
(Continuous
Nominal 1 W, lm
Nominal
Crossover
Model
(-IOdB)
Exterior Dimensions
Pink Noise)
Program)
Net
Impedance (3.3 ft)
Dispersion
Frequency (Height x Width x Depth)
Weight
MI-291
1.5-l 5 kHz
150w
300 w 8
ohms
105dB
90h x 4Ov
1.5 kHz
127mm x 387mm x 248 mm
4.5 kg
5 in x 15% rn x 9% rn
10 Ibs
MI-630
60 Hz-l 5 kHz
150w
300 w 8 ohms
IOOdB
90h x 40~ 2.0 kHz
533mm x 454mm x 287mm
i
22 kg
21 in x 17’/8 in x 11% rn
48 Ibs
MI-631
60 Hz-l 5 kHz 15ow
300 w 8 ohms 1OOdB
90h x 4Ov 2 kHz
349mm x 434mm x 530mm
21 kg
13% m x 17% In x 207/8 rn
46 Ibs
MI-632A 45 Hz-15 kHz
150w
300 w 8 ohms 104dB
90h x 4Ov 1.5 kHz
826mm x 61 Omm x 445mm
45.5 kg
32% rn x 24 in x 17% rn
100 Ibs
Ml-634
40 Hz-l 5 kHz
150w
300 w 8 ohms
102dB
90h x 4Ov 1.5 kHz
686mm x 559mm x 292mm
34 kg
27 in x 22 rn x 11% in
75 Ibs
‘Sensltlvrty measured
with an Input
averaged from
500 Hz to 2 5 kHz
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