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Jbl 4344 Technical Manual
Jbl 4344 Technical Manual Free

P R O F E S S I O N A L S E R I E S

L O U D S P E A K E R S Y S T E M

A NEW STANDARD FOR A NEW CENTURY

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, performance 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 SPECS - Lansing Heritage. The 3 Series meet JBL’s high standards for accuracy and long-term reliability in demanding professional applications. All 3 Series models incorporate JBL Professional transducer and network technologies to provide accurate frequency response, exceptional low frequency extension and high SPL capability. JBL Linear Spatial Reference (LSR) design.

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.

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Table of Contents

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

©1996 JBL, Incorporated. JBL is a registered trademark of JBL, Incorporated.

Printed in USA 2/97 Part No. 4344MkIIOM97

A Harman International Company

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

With the Professional Series 4344MkII Loudspeakers, JBL

Jbl 4344 Technical Manual

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' highfrequency 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.

Low-Frequency Transducer

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.

Mid-Frequency Transducer

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.

High-Frequency Transducer

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 highfrequency 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 soundstage with pinpoint imaging.

ultrahigh-Frequency Transducer

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.

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Type: Owner's manual for JBL 4344 MKII

Pages: 14

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 y