JBL MI-15a Manuel utilisateur

Musical Instrument Loudspeakers

The new JBL MI Series Loudspeak-

ers 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 speak-

ers 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 effi-

ciency 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 non-

symmetrical 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, lis-

ten to the Ml Series at your JBL dealer.

The Ml Series loudspeakers are avail-

able 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, key-

board, or P.A. system. They directly

replace conventional speakers used in

guitar amplifiers, organs, electric pi-

anos, or other applications.

Combine the new Ml Series loud-

speakers with all new cabinet designs

and JBL expertise in system design

and you have the all new Ml Series

Component Systems.

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 dia-

mond-pattern surround. The excep-

tionally high stress limit of titanium

together with the stronger surround

allows this design to achieve the per-

formance of more expensive and frag-

ile 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 com-

pound for maximum strength and are

covered with durable industrial-grade,

reinforced pebble grained material.

Corners are protected with heavy

hi-632~ -

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 reinforce-

ment 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 flat-

front Bi-Radial’” horn and compres-

sion driver mounted flush in the cabi-

net to eliminate the problems of

midrange narrowing and high fre-

quency beaming associated with

conventional horn designs.

MI-631 Stage Monitor

Smooth, wide frequency response

(60 Hz-l 5 kHz), uncolored reproduc-

tion, and high directivity make this an

ideal stage monitor, acoustic instru-

ment 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 con-

trolled sound. A three-position HF

level control switch allows precise tai-

loring 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 Flat-

Front Bi-Radial’” horn and compres-

sion driver and the new Ml-l 5A 380

mm (15”) low frequency driver to pro-

vide 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 instru-

ment reinforcement and general

sound amplification in small to mod-

erate 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 add-

on system which allows simple instal-

lation to existing systems.

MI-ZY

MI-W4 -

MI Series Specifications

MI Series Loudspeaker Specifications

Specifications MI-l0 MI-12 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 @ 1m (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 51mm 51mm 51mm

2 in 2 I” 2 I”

Votce Co11Matenal -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.

*Sensitivitymeasured

with an input averaged from 500

Hzto

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

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

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 207/8rn 46 Ibs

MI-632A 45 Hz-15 kHz 150w 300 w 8 ohms 104dB 90h x 4Ov 1.5 kHz 826mm x 61Omm 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

‘Sensltlvrtymeasured

with an Input

averagedfrom

500 Hz to 2 5 kHz

Ce manuel convient aux modèles suivants

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