Meyer SoundメーカーHM-1Sの使用説明書/サービス説明書
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Patents Pending Operating Instructions HM-1S Self-Powered S tudio Monitor Copyright © 1998 Meyer Sound Laboratories, Inc. All rights reserved Part # 05.
2 Introduction .......................................................... 3 Power Requirements ............................................ 3 Power Cable Requirements .................................. 5 Audio Input ...................................
3 Introduction The Meyer HM-1S S tudio Monitor is a compact, full- range, self-powered reference monitor that employs a concentric tweeter mounting structure to achieve true point-source performance.
4 Power Supplies for Larger Systems If an installation includes more than 10 speakers, or requires several speakers to operate from a single 48 V line, a single, high-output power supply should be considered. The following sections provide current and voltage specifications for the HM-1S s power requirements.
5 audio interruption. In the third, and preferable case, supplies that feature voltage foldback allow brief periods of current-limit without audio interruption; for this reason, we recommend using such supplies. The HM-1S does not require tight voltage regulation and operates down to 35 V although peak SPL values are reduced.
6 HM-1S Speaker Cable The following drawings and procedures are provided as an aid in the event that the speaker cable used to connect the HM-1S to the HM-1S Subwoofer needs to be repaired or extended.
7 HM-1S to HM-1S Subwoofer Cable Connector Assembly Procedure Cable Boot Cord Connector Cable Clamp Housing Contact Pins Coupling Ring Step 1: Feed the end of the cable through the boot, cable clamp housing, and coupling ring in the order and position shown.
8 Subwoofer Performance V erification There are two methods of verifying that the phase relationship between the HM-1S and its subwoofer. One method is free field, the other is a ground plane measurement in half space.
9 This represents a typical response of the HM-1S in free-field environment, on axis at 1 meter. This measurement was performed in the large anechoic chamber at MSLI. Connect the subwoofer and measure the combined response of the system. HM-1S on axis at 1 meter , free field.
10 This represents a typical response of the HM-1S and subwoofer, in phase, in a free field environment on axis at 1 meter. This measurement was performed in the large anechoic chamber at MSLI. This response indicates a complementary phase relationship between the HM-1S and subwoofer.
11 If the subwoofer is out of phase, the combined response will have a significant loss of energy compared to the overall response at around 82 Hz as illustrated below: HM-1S with out-of-phase subwoofer on axis at 1 meter , free field.
12 This represents a typical response of the HM-1S and subwoofer out-of-phase phase, in a free field environment on- axis at 1 meter. This measurement was performed in the large anechoic chamber at MSLI. If your system response indicates a phase reversal please contact Meyer Sound Technical Support for assistance.
13 This represents a typical ground-plane response of the HM-1S, on-axis at 1 meter. Keep in mind that any surface close to the test space can create reflections which will change the response of the speaker. Connect the subwoofer to the HM-1S and measure the combined response of the system.
14 HM-1S with in-phase Subwoofer on axis at 1 meter , ground plane. This represents a typical ground-plane response of the HM-1S and subwoofer, in phase, at 1 meter. This response indicates a complementary phase relationship between the HM-1S and subwoofer.
15 HM-1S with out-of-phase Subwoofer on axis at 1 meter , ground plane. If the subwoofer is out of phase the combined response will have a significant loss of energy compared to the overall response a.
16 Cooling and Fan Installation The HM-1S depends on natural convection to cool the heatsinks that absorb heat from the amplifiers and radiate the heat into the surrounding air space. Natural convection requires free air in back of, and underneath the HM-1S to allow air to flow up over the heatsinks.
17 T o reduce the risk of electric shock, disconnect the loud- speaker from the AC adapter before installing audio cable. Reconnect the adapter only after making all signal con- nections. Connect the AC adapter to a two-pole, three wire grounding mains receptacle.
18 Meyer Sound Laboratories, Inc. 2832 San Pablo Avenue Berkeley, California 94702 Telephone: 510 - 486 - 1166 FAX: 510 - 486 - 8356 E-mail: techsupport@meyersound.
デバイスMeyer Sound HM-1S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：
Meyer Sound HM-1S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Meyer Sound HM-1S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。Meyer Sound HM-1S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。Meyer Sound HM-1S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。
Meyer Sound HM-1S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Meyer Sound HM-1S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、Meyer Sound HM-1S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Meyer Sound HM-1S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。
