JBLメーカー4344MKIIの使用説明書/サービス説明書
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PROFESSIONAL SERIES LOUDSPEAKER SYSTEM 4344MkII A NEW ST ANDARD FOR A NEW CENTUR Y 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. T o promote diversity and creativity , JBL operates independently in research and development.
Low-Frequency T ransducer 4 Mid-Frequency T ransducer 5 High-Frequency T ransducer 5 Ultrahigh-Frequency T ransducer 5 Dividing Networks 6 Battery Replacement 7 Placement 8 Speaker Connections 9 Bi-W .
No. 4 W ith 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.
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.
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.
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).
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.
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.
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.
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-W ire position (Figure 5a).
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.
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.
No. 14 Frequency Response: 30Hz – 22kHz – 6dB Sensitivity: 95dB for 2.83V @ 1 meter Recommended Maximum 200 watts continuous Power Handling: 800 watts peak Nominal Impedance: 6 ohms Crossover Freq.
デバイスJBL 4344MKIIの購入後に（又は購入する前であっても）重要なポイントは、説明書をよく読むことです。その単純な理由はいくつかあります：
JBL 4344MKIIをまだ購入していないなら、この製品の基本情報を理解する良い機会です。まずは上にある説明書の最初のページをご覧ください。そこにはJBL 4344MKIIの技術情報の概要が記載されているはずです。デバイスがあなたのニーズを満たすかどうかは、ここで確認しましょう。JBL 4344MKIIの取扱説明書の次のページをよく読むことにより、製品の全機能やその取り扱いに関する情報を知ることができます。JBL 4344MKIIで得られた情報は、きっとあなたの購入の決断を手助けしてくれることでしょう。
JBL 4344MKIIを既にお持ちだが、まだ読んでいない場合は、上記の理由によりそれを行うべきです。そうすることにより機能を適切に使用しているか、又はJBL 4344MKIIの不適切な取り扱いによりその寿命を短くする危険を犯していないかどうかを知ることができます。
ですが、ユーザガイドが果たす重要な役割の一つは、JBL 4344MKIIに関する問題の解決を支援することです。そこにはほとんどの場合、トラブルシューティング、すなわちJBL 4344MKIIデバイスで最もよく起こりうる故障・不良とそれらの対処法についてのアドバイスを見つけることができるはずです。たとえ問題を解決できなかった場合でも、説明書にはカスタマー・サービスセンター又は最寄りのサービスセンターへの問い合わせ先等、次の対処法についての指示があるはずです。
