4344 MK 11 Manual 7/21/98 3:18 PM Page 16 4344MkII P R O F E S S I O N A L L O U D S P E A K E R S E R I E S S Y S T E M A NEW STANDARD FOR A NEW CENTURY
4344 MK 11 Manual 7/21/98 3:18 PM Page 14 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.
4344 MK 11 Manual 7/21/98 3:18 PM Page 2 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 Declaration of Conformity We, JBL Europe A/S Kongevejen 194B DK-3460 Birkerød DENMARK JBL Consumer Products 80 Crossways Park West, Woodbury, NY 11797 8500 Balboa Boulevard
344 MK 11 Manual 7/21/98 3:18 PM Page 3 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.
4344 MK 11 Manual 7/21/98 3:18 PM Page 4 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.
4344 MK 11 Manual 7/21/98 3:18 PM Page 5 Dividing Networks 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. Professional Series No.
4344 MK 11 Manual 7/21/98 3:18 PM Page 6 Battery Replacement 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.
4344 MK 11 Manual 7/21/98 3:18 PM Figure 2 Placement Page 7 Placement 3' 3' Position Top View 3' 3' 10 – 15 10 – 15 Position Front View 3' 3' Ear level when seated in listening position No. 8 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.
4344 MK 11 Manual 7/21/98 3:18 PM Page 8 Speaker Connections The 4344MkII loudspeakers can be connected by one of several methods. 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. Figure 3 Connections Bare Wire Connecting Method JBL INCORPORATED 8500 BALBOA BLVD.
4344 MK 11 Manual 7/21/98 3:18 PM Page 9 Bi-Wiring 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: Reduction of Intermodulation No.
4344 MK 11 Manual 7/21/98 3:18 PM Page 10 Bi-Wiring Connections Figures 5 through 8 show two bi-wiring options, single-stereo amplifier and dual-stereo amplifier modes. For passive and bi-wire connections, set the switch to the Normal/Bi-Wire position (Figure 5a). Figure 5 Bi-Wire Connecting Method AMP NORMAL/ BI-WIRE JBL INCORPORATED 8500 BALBOA BLVD. NORTHRIDGE, CA USA HIGH FREQUENCY LOW FREQUENCY Important 1.
4344 MK 11 Manual 7/21/98 3:18 PM Figure 9 Bi-Amp Connecting Method AMP NORMAL/ BI-WIRE JBL INCORPORATED 8500 BALBOA BLVD. NORTHRIDGE, CA USA HIGH FREQUENCY LOW FREQUENCY Figure 9a Bi-Amp Switch Setting BI-AMP BATTERY No. 12 NORMAL/ BI-WIRE Page 11 Bi-Amping Connections The optimal method of powering the 4344MkII system is with two amplifiers, one for low frequencies and one for the mid/high frequencies. It is necessary to use a high-quality active crossover module.
4344 MK 11 Manual 7/21/98 3:18 PM Page 12 Maintenance and Service The 4344MkII loudspeaker systems have an oiled finish. Cleaning should be done with an untreated dust cloth. Do not use conventional furniture waxes and polishes, which are not designed for oiled finishes. If touch-up is necessary or the finish appears to be drying out, the surface may be re-oiled with a commercially available oil-finishing preparation. Do not use any solvents on the finish. The grille may be gently vacuumed.
4344 MK 11 Manual 7/21/98 3:18 PM Page 13 System Specifications Frequency Response: 30Hz – 22kHz –6dB Sensitivity: 95dB for 2.
