JBL 4344 MKII Manuel utilisateur

PROFESSIONAL SERIES

LOUDSPEAKER SYSTEM

4344MkII

A NEW STANDARD FOR A NEW CENTURY

4344 MK 11 Manual 7/21/98 3:18 PM Page 16

JBL is part of the Harman International family of audio companies, a group

with a common purpose: combining technology with a love of music to

manufacture audio products that provide new levels of satisfaction, perform-

ance and value.

To promote diversity and creativity, JBL operates independently in research

and development. When it comes to translating the results of these efforts

into actual consumer and professional products, JBL draws on the full

combined strength of the Harman companies, including one of the world’s

most advanced manufacturing facilities. The result of this teamwork is that

JBL’s renowned excellence in engineering is successfully carried through to

each individual product, regardless of its application or price range.

As new audio concepts and technologies are pioneered, the partnership of

JBL and Harman International guarantees that consumer and professional

audio users everywhere will be able to enjoy their full beneﬁts.

JBL continually engages in research related to product development and

improvement. Because of this, new materials, production methods and

design reﬁnements may be introduced into existing products without notice.

For this reason, any current JBL product may differ in some respect from

its published description, but will always equal or exceed the original

design speciﬁcations unless otherwise stated.

4344 MK 11 Manual 7/21/98 3:18 PM Page 14

Low-Frequency Transducer 4

Mid-Frequency Transducer 5

High-Frequency Transducer 5

Ultrahigh-Frequency Transducer 5

Dividing Networks 6

Battery Replacement 7

Placement 8

Speaker Connections 9

Bi-Wiring 10

Maintenance and Service 13

System Speciﬁcations 14

JBL Consumer Products

80 Crossways Park West, Woodbury, NY 11797

8500 Balboa Boulevard, Northridge, CA 91329

1-800-336-4JBL (4525) (USA only)

www.jbl.com

trademark of JBL, Incorporated.

Printed in USA 2/97 Part No. 4344MkIIOM97

Table of Contents

Declaration of Conformity

We, JBL Europe A/S

Kongevejen 194B

DK-3460 Birkerød

DENMARK

declare in own responsibility, that the loudspeakers

described in this owner’s manual are in compliance with

technical standards:

EN 50 081-1/1992

EN 50 082-1/3.1995

Steen Michaelsen

JBL Europe A/S

Birkerød. DENMARK. 2/97

A Harman International Company

4344 MK 11 Manual 7/21/98 3:18 PM Page 2

No.

With the Professional Series 4344MkII Loudspeakers, JBL

combines the most advanced technology with a classic JBL design. These

speakers continue the longstanding tradition of precise studio monitor

sound for which JBL is famous. You will enjoy the benefits of a 2" high-

frequency compression driver, cast frame low-frequency transducers with

vented pole pieces, and JBL’s proprietary Symmetrical Field Geometry

magnet design, as well as high definition dividing networks incorporating

the highest quality electronic components available.

The 4344MkII features an all-new 15" (381mm) low-frequency

transducer developed speciﬁcally for the 4344MkII. Derived from

JBL’s legacy of highly powerful yet efﬁcient bass drivers, this woofer

delivers full low-frequency performance with clarity and speed

unprecedented among 15" drivers. The voice coil is 4" (102mm) in

diameter and wound on edge from ﬂat aluminum ribbon wire on a

thermoset composite™form.

The cone is a rigid paper composite, treated with Aquaplas™for strength,

speed, and damping. JBL’s Symmetrical Field Geometry is employed in

the form of an aluminum sleeve around the pole piece. This sleeve reduces

second-order distortion through induced ﬂux control. Its aluminum

composition is also a more efﬁcient conductor of heat, so it assists in

dissipating heat away from the voice coil to extend the power capacity.

Cooling of the voice coil is further enhanced by the use of a vented pole

piece. The rigid frame is cast from aluminum alloy, an excellent

thermal conductor, which further acts to efﬁciently draw heat away from

the voice coil and magnet assembly. This combination of advanced design

technology results in a bass driver that is remarkably free from dynamic

restriction due to heat buildup.

Low-Frequency Transducer

4344 MK 11 Manual 7/21/98 3:18 PM Page 3

The 4344MkII also features a 10" (254mm) mid-frequency transducer.

The voice coil is 3" (76mm) in diameter and wound on edge from ﬂat

copper ribbon wire on a thermoset composite™form. Its very high-power

capability and freedom from breakup make it an ideal midrange in a system

that is designed to play at high levels with absolutely no signs of distress. It

makes the transition from the woofer at 340Hz, providing excellent response

throughout the important vocal range.

Throughout the history of high-frequency transducer design, the goal of

extended frequency response has been at odds with the need for high

power handling. The 4344MkII utilizes a 2" compression driver with

an Aquaplas-coated titanium dome. JBL has long chosen titanium as the

material for its highest-quality high-frequency transducers and the

4344MkII is no exception. Titanium possesses the essential requirements

for a high-frequency transducer. First, titanium is extremely light, yet

rigid. The goal is to maintain a piston-like action as high in frequency as

possible. Should the material ﬂex easily, the diaphragm will break up into

random vibrations. Second, titanium is virtually immune to fatigue,

unaffected by the cumulative effect of millions of ﬂexures over long

operating periods. These factors coupled with the higher power handling

that titanium affords, allow us to produce an extremely smooth high-

frequency transducer with extended frequency response that can handle all

the demands of today’s digital programs. The Horn/Lens assembly ensures

controlled distribution of the high frequencies, resulting in a wide sound-

stage with pinpoint imaging.

For the ultrahigh-frequency transducer, we chose a 1-3/4" compression

driver with an edge-wound aluminum voice coil. This driver reproduces

all of the ultrahigh frequencies above 8000Hz with incredible clarity

and detail.

High-Frequency Transducer

No.

Mid-Frequency Transducer

ultrahigh-Frequency Transducer

4344 MK 11 Manual 7/21/98 3:18 PM Page 4

The job of the dividing network is to distribute the various frequencies to

their respective transducers. The network is also designed to complement

component location on the bafﬂe. Slopes are chosen to match the exact

response of each driver in its respective frequency range, as well as to

ensure that the high-frequency transducers are adequately protected from

dangerous low-frequency components.

For the 4344MkII system, we chose our Charge-Coupled Linear

Deﬁnition™Dividing Network. The inductors are all designed for high-

current, low-distortion operation. All capacitors in the network are

series/parallel connected and operated with D.C. bias. This effectively

enables the capacitors to operate in “Class A” mode, which substantially

increases sonic detail, resolution, and dynamics. The low-frequency section

of the dividing network is mounted on a dedicated circuit board that

separates both electrical and magnetic properties from that of the

midrange and tweeter sections.

Additionally, the 4344MkII’s dividing network allows for passive,

bi-wire, passive bi-amp, and full active bi-amp operation. For the full active

bi-amp mode we recommend the use of a high-quality electronic crossover.

Dividing Networks

No.

–∞

–6.5

–2.5

+1.5

–∞

–6.5

–2.5

+1.5

–∞

–6.5

–2.5

+1.5

ULTRA HIGH FREQUENCY LEVEL, dB

HIGH FREQUENCY LEVEL, dB

MID FREQUENCY LEVEL, dB

Serial Number:

Professional Series

JBL Incorporated, Northridge, CA USA

Model 4344MkII

Level adjustments

are provided to allow

precision frequency

response contouring. The

midrange, high-frequency,

and ultrahigh-frequency

drivers may be fine-tuned

for optimum sound in any

listening room.

4344 MK 11 Manual 7/21/98 3:18 PM Page 5

The battery should be replaced approximately every 2 years. This is

accomplished as follows:

• Unscrew the two screws that hold the battery access cover in place. It

is located on the upper portion of the dividing network, on the rear of

the speaker enclosure (Figure 1).

• Write today’s date, including the year, in this manual.

• Install the battery by aligning the battery terminals with the mating

terminals in the network housing. Align male to female, female to

male terminals, then snap the connectors together, assuring a tight

connection.

• Replace the battery access cover and install screws.

Battery Replacement Record

Date Installed: No.

Battery Replacement

BATTERY

BI-AMP

High Frequency

Low Frequency

JBL INCORPORATED

8500 Balboa Blvd., Northridge, CA USA

NORMAL/

BI-WIRE

Figure 1 Battery Installation

4344 MK 11 Manual 7/21/98 3:18 PM Page 6

Ideally the systems should be placed at least three feet from any walls. The

height, at the bottom of the Lens assembly, should be at ear level. The two

speakers should be equidistant from your primary listening position; the

distance should be determined by the distance between the speakers. We

recommend that the angle between the speakers, at the listening position,

be between 45° to 60°. For example, if the speakers are 8' apart, your

listening position should be 8'–12' from each speaker. To widen the area in

which the best stereo image will be perceived, turn the speaker to face the

primary listening position (Figure 2).

It is normally recommended that the 4344MkII loudspeakers be

positioned so that the ultrahigh-frequency transducers are towards the out-

side. In some listening environments, however, the imaging characteristics

may be improved by positioning the ultrahigh-frequency transducers

towards the inside. We suggest you experiment with the positioning of

your loudspeakers to determine the ideal placement in your listening room.

Placement

No.

10 –15

3'3'

10 –15

3'3'3'3'

Ear level when

seated in

listening position

Figure 2 Placement

Position Top View

Position Front View

4344 MK 11 Manual 7/21/98 3:18 PM Page 7

The 4344MkII loudspeakers can be connected by one of several meth-

ods. The binding posts on the rear panel of the 4344MkII will accept

most types of audio cable and connectors, including banana plugs and

bare wire (Figure 3). Follow the hookup method that best describes your

system.

1. For each channel, connect the red (+) terminal on the

4344MkII to the red (+) terminal on your ampliﬁer.

2. For each channel, connect the black (–) terminal on the

4344MkII to the black (–) terminal on the ampliﬁer.

Connecting the systems in this manner ensures that they will operate in

phase; that is, they will work together rather than in opposition.

Connecting the speaker system out of phase will not cause damage but

will adversely affect the speaker’s sound.

No.

Speaker Connections

LOW FREQUENCY

HIGH FREQUENCY

LOW FREQUENCY

JBL INCORPORATED

8500 BALBOA BLVD. NORTHRIDGE, CA USA

HIGH FREQUENCY

JBL INCORPORATED

8500 BALBOA BLVD. NORTHRIDGE, CA USA

Figure 3 Connections

Banana/Spade

Connecting Method

Bare Wire

Connecting Method

LOW FREQUENCY

HIGH FREQUENCY

JBL INCORPORATED

8500 BALBOA BLVD. NORTHRIDGE, CA USA

Figure 4 Standard

Connecting Method

Standard Connections (Figure 4)

4344 MK 11 Manual 7/21/98 3:18 PM Page 8

The 4344MkII’s outer connection panel and internal dividing

network are designed so that separate sets of speaker cable can be attached

to the low-frequency transducer and midrange/high-frequency transducer

portions of the dividing network. This is called bi-wiring. Bi-wiring can

provide several sonic advantages and considerably more ﬂexibility in

power ampliﬁer selection. The advantages of bi-wiring are as follows:

The majority of current ﬂowing between an ampliﬁer and speaker is devoted

to bass reproduction. In fact, 60% or more of an ampliﬁer’s output is des-

tined for the woofers. When current ﬂows through a wire, it produces an

electro-magnetic ﬁeld (EMF) that expands and collapses at a rate equal to

that of the music’s complex frequency components. If a single speaker

wire must conduct the full musical frequency, the preponderance of low-

frequency information can interact with or modulate high frequencies.

The resulting intermodulation can create audible changes to the high

frequencies even before they reach the loudspeakers.

By using separate cables for high and low frequencies, unwanted high-

frequency modulation is avoided. Low-frequency information ﬂows

through one cable while high frequencies ﬂow through another.

Having the opportunity to use separate low- and high-frequency cables

allows you to use cables best suited to each frequency range. Optimally,

you should use high-quality, audiophile-grade speaker cables for both low-

and high-frequency conductors. However, let your ears guide you to the

cables that best match the 4344MkII loudspeakers to your ampliﬁer.

Bi-wiring also allows you the option of using separate stereo power

ampliﬁers for left and right speakers, or even four mono ampliﬁers.

Whether you use two or four ampliﬁers, it is important to use the same

brand and model to power like connections on the 4344MkII.

Frequency-optimized Cables

No.

Reduction of Intermodulation

Bi-Wiring

Amplifier Flexibility

4344 MK 11 Manual 7/21/98 3:18 PM Page 9

Ce manuel convient aux modèles suivants

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