AlesisメーカーEC-2の使用説明書/サービス説明書
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EC-2 96kHz Sample Rate Upgrade A/D and D/A Converter Cards for the ADAT HD24 Hard Disk Recorder O WNER ’ S M ANUAL V ERSION 1.0 A PPLIES TO ADAT HD24 SOFTWARE V ERSION 1.
EC-2 96kHz A/D/D/A upgrade • appendix A EC-2 Manual © 2002 Alesis. All rights reserved. Reproduction in whole or in part is prohibited. Specifications Subject To Change Without Notice.
appendix A EC-2 Manual A-1 EC-2 96kHz Upgrade Cards This document covers only those aspects unique to the EC-2 cards and should be kept with the HD24 manual. Table of Contents Important Safety Instructions ................................ 2 Safety symbols used in this product .
EC-2 96kHz A/D/D/A upgrade • appendix A A-2 EC-2 Manual Important Safety Instructions Safety symbols used in this product This symbol alerts the user that there are important operating and maintenance instructions in the literature accompanying this unit.
appendix A • EC-2 96kHz A/D/D/A upgrade EC-2 Manual A-3 Installing the EC-2 into the HD24 Precautions The EC-2 boards should only be installed by a dealer or trained technician. End users should only attempt installation if they have experience with this type of procedure.
EC-2 96kHz A/D/D/A upgrade • appendix A A-4 EC-2 Manual Prepare to install: 1. Disconnect the HD24’s AC power cable, and make sure you are working on a clean, flat, hard surface. Ground yourself by touching a grounded metal object. An anti-static workstation with anti-static mat and wrist strap is highly recommended.
appendix A • EC-2 96kHz A/D/D/A upgrade EC-2 Manual A-5 Install the new EC-2 PCBs 7. Find the daughterboard in the EC-2 package: it has two 26-pin flexible cables attached to it. Insert the ribbon connector labeled “J4 TO MAIN PCB” on the daughterboard into the 26- pin header labeled on the main PCB as “J15 TO A/D PCB”.
EC-2 96kHz A/D/D/A upgrade • appendix A A-6 EC-2 Manual Connect the PCBs 13. Connect the daughterboard to the Input and Output PCBs: Line up the connectors to the bottom (D/A) and top (A/D) PCBs, ma.
appendix A • EC-2 96kHz A/D/D/A upgrade EC-2 Manual A-7 Synchronizing at high sample rates: To record more than 12 tracks in the high sample rate mode, simply synchronize two HD24/EC-2 units together by linking them with an ADAT Sync cable (see page 24 of the HD24 manual).
EC-2 96kHz A/D/D/A upgrade • appendix A A-8 EC-2 Manual About the EC-2’s audio performance An HD24 with the EC-2 upgrade has audio performance far superior to that of any analog recorder, and a wider dynamic range than most input and output devices that may be connected to it.
appendix A • EC-2 96kHz A/D/D/A upgrade EC-2 Manual A-9 aliasing, the steeper the filter, the better. Some converters boasted 10 th -order (-60 dB per octave) filters. For comparison, most loudspeaker crossovers have 3 rd or 4 th -order filters (-18 or –24 dB per octave).
EC-2 96kHz A/D/D/A upgrade • appendix A A-10 EC-2 Manual Extending the frequency range of other studio equipment Even though an ADAT HD24 equipped with the EC-2 upgrade gives you the capability of recording audio beyond 40 kHz, many other elements of your studio may need to be upgraded to truly take advantage of this capability.
appendix A • EC-2 96kHz A/D/D/A upgrade EC-2 Manual A-11 Using the HD24/EC-2 with computer workstations and digital mixers Because the EC-2 upgrade provides 24 high quality inputs and outputs, it ca.
EC-2 96kHz A/D/D/A upgrade • appendix A A-12 EC-2 Manual Using the HD24/EC-2 with the Alesis AI-4 AES/EBU Interface The Alesis AI-4 AES/EBU Digital Audio Interface is a single-rack space unit availa.
EC-2 Manual A-1 3 Specifications For the Alesis HD24 with EC-2 96 kHz Sample Rate Upgrade A/D and D/A Converter Boards: AUDIO INPUT Input Connectors: 24 balanced 1/4" TRS jacks Nominal Input Level: +4 dBu (1.23 V RMS ) = -15 dBFS Maximum Input Level: +19 dBu (6.
デバイスAlesis EC-2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：
Alesis EC-2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Alesis EC-2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。Alesis EC-2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。Alesis EC-2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。
Alesis EC-2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Alesis EC-2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、Alesis EC-2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Alesis EC-2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。
