JBL Professional CSM-28 Commercial Series 8-input, 2-output Audio Mixer User Manual

1. はじめに

The JBL Professional CSM-28 is an 8-input, 2-output commercial series audio mixer designed for various applications including background music, security, and paging systems. Its versatile design makes it suitable for environments such as schools, hospitals, restaurants, and fitness facilities. The unit features RJ45 connectors for compatibility with JBL CSR-V in-wall volume controls and includes a universal power supply (100-240 VAC, 50/60 Hz).

主な機能は次のとおりです。

8 inputs with 2 channel outputs.
Fanless, space-saving 1U design.
Independent bass/treble controls for each channel.
Euro-block type mic/line input and output connectors, and unbalanced RCA inputs for consumer devices.
Illuminated rings on controls for improved visibility and ease of use.

JBL Professional CSM-28 Audio Mixer Front View

図1: 前面 view of the JBL Professional CSM-28 Audio Mixer. This image shows the compact 1U design and front panel controls.

2. セットアップ

2.1 開梱と検査

ミキサーを梱包から慎重に取り出してください。輸送中に生じた損傷がないか確認してください。将来の輸送や保管のために、元の梱包は保管しておいてください。

2.2電源接続

Connect the supplied AC power cord to the mixer's power inlet and then to a suitable AC power outlet. The unit accepts universal AC voltages from 100 to 240 VAC, 50/60 Hz.

2.3 入出力接続

The CSM-28 features various input and output options. Refer to the rear panel diagram for specific connection points.

マイク/ライン入力: Use Euro-block connectors for balanced microphone or line-level signals.
RCA入力： Utilize unbalanced RCA inputs for connecting consumer audio devices such as CD players or media players.
出力: 接続する amplifiers or other audio processing equipment using the Euro-block output connectors.
JBL CSR-V Control: Use RJ45 connectors for connecting optional JBL CSR-V in-wall volume controls.

JBL Professional CSM-28 Audio Mixer Rear Panel

Figure 2: Rear panel connections of the JBL Professional CSM-28 Audio Mixer. This image illustrates the various input (Euro-block, RCA) and output (Euro-block) ports, as well as the power inlet and RJ45 connectors for remote control.

3. 操作手順

3.1 電源のオン/オフ

Ensure all connections are secure before powering on. Use the power switch, typically located on the front or rear panel, to turn the unit on or off. Allow a few seconds for the system to stabilize after powering on.

3.2 入力レベル調整

Each input channel has a dedicated level control. Adjust these controls to achieve an optimal signal level without clipping or distortion. Monitor the signal indicators (if present) to ensure proper gain staging。

3.3 トーンコントロール

The CSM-28 features independent bass and treble controls. Use these to fine-tune the tonal characteristics of the audio signal for each channel or output zone, depending on the model's configuration.

3.4 出力レベル調整

Adjust the master output level controls to set the overall volume for the connected amplification system or speakers. Ensure the output level is appropriate for the listening environment and does not overload downstream equipment.

4. メンテナンス

4.1 クリーニング

To clean the exterior of the mixer, use a soft, dry cloth. For stubborn dirt, a slightly damp cloth with a mild, non-abrasive cleaner can be used. Ensure the unit is powered off and disconnected from the power source before cleaning. Avoid using harsh chemicals or solvents.

4.2換気

The CSM-28 features a fanless design, relying on passive cooling. Ensure that the ventilation slots (if any) are not obstructed to allow for proper heat dissipation. Do not operate the unit in enclosed spaces without adequate airflow.

4.3 ストレージ

When not in use for extended periods, store the mixer in a cool, dry place, away from direct sunlight and extreme temperatures. It is recommended to use the original packaging for protection during storage or transport.

5。トラブルシューティング

問題	考えられる原因	解決
オーディオ出力なし	電源が接続されていないか、ユニットがオフになっています。入力/出力ケーブルが正しく接続されていません。 Input/output levels set too low. 接続 amp充電器/スピーカーがオフになっているか故障しています。	Verify power connection and turn unit on. すべてのオーディオケーブルの接続を確認します。 Increase input and output level controls. Ensure external audio equipment is functioning.
歪んだオーディオ	入力レベルが高すぎます（クリッピング）。出力レベルが高すぎます。ケーブルまたは接続に欠陥があります。	Reduce input gain for the affected channel. Lower master output level. 損傷したケーブルを点検し、交換してください。
ハムまたはノイズ	グラウンドループの問題。シールドなしケーブル。他の電子機器からの干渉。	可能な場合はバランスケーブルを使用してください。すべての機器が適切に接地されていることを確認してください。 Move mixer away from power supplies or transformers.

6. 仕様

特徴	詳細
モデル番号	CSM28
入力	8 (Mic/Line Euro-block, RCA)
出力	2 (Euro-block)
電源	100-240 VAC, 50/60 Hz (Universal)
アイテム重量	7.5ポンド（3.4kg）
製品寸法（長さ x 幅 x 高さ）	17.2 x 11.9 x 1.7 インチ (43.7 x 30.2 x 4.3 cm)
接続技術	Euroblock, RCA
コントロール	Independent Bass/Treble, Input Level, Output Level

7. 保証情報

JBL Professional products are covered by a limited warranty. The specific terms and duration of the warranty may vary by region and product. Please refer to the official JBL Professional web保証に関する詳しい情報と登録手続きについては、当社のウェブサイトまたはお近くの販売店にお問い合わせください。保証請求の際に必要となる購入証明書は保管してください。

For warranty service, contact JBL Professional customer support or an authorized service center.

8. サポート

For technical assistance, product inquiries, or service requests, please contact JBL Professional support through their official website. Online resources, including FAQs and additional documentation, may also be available.

JBLプロフェッショナル Webサイト： https://pro.harman.com/brands/jbl

JBL CSM28