1. はじめに
Thank you for choosing the HIFIMAN SUNDARA Planar Magnetic Headphones. The SUNDARA headphones are engineered to deliver an exceptional audio experience, featuring advanced planar magnetic technology and a comfortable, durable design. This manual provides essential information for setting up, operating, maintaining, and troubleshooting your headphones to ensure optimal performance and longevity.

Figure 1: HIFIMAN SUNDARA Planar Magnetic Headphones
主な特徴:
- NEO 'supernano' Diaphragm (NsD): Utilizes a diaphragm 80% thinner than previous designs, resulting in enhanced detail, faster transient response, and an extended frequency range.
- ハイブリッドヘッドバンドデザイン: Features a separate head strap that evenly distributes headphone weight for improved comfort during extended listening sessions.
- 耐久性のある構造: The headband structure is designed for everyday use, combining durability with an aesthetic appeal.
- 3.5mm Connectors: Equipped with standard 3.5mm sockets for improved connectivity and robust physical connection.
2. 箱の中身
Please check the contents of your SUNDARA package. If any items are missing or damaged, contact your retailer or HIFIMAN customer support.
- HIFIMAN SUNDARA Planar Magnetic Headphones
- Headphone Cable (with 3.5mm connectors)
- 3.5mm-to-6.35mm Adapter
3. セットアップ手順
Follow these steps to set up your HIFIMAN SUNDARA headphones:
- 開梱: ヘッドフォンと付属品をパッケージから慎重に取り出します。
- ケーブルの接続: Locate the two 3.5mm connectors on the headphone cable. Insert one connector into the port on the left earcup and the other into the port on the right earcup. Ensure they are securely seated.
- オーディオソースへの接続: Connect the other end of the headphone cable (the single 3.5mm jack) to your audio source (e.g., amplifier, digital audio player, computer). If your audio source requires a 6.35mm (1/4 inch) jack, use the included 3.5mm-to-6.35mm adapter.

Figure 2: Detail of earcup and headband connection
For a visual guide on setting up your HIFIMAN SUNDARA headphones, please watch the official product video below:
Video: Official HIFIMAN SUNDARA Over-ear Full-size Planar Magnetic Headphones overview とセットアップ。
4. 操作手順
The HIFIMAN SUNDARA headphones are designed for comfortable and high-fidelity listening. Follow these guidelines for optimal use:
- ヘッドフォンの装着: Adjust the headband so that the earcups sit comfortably over your ears, fully enclosing them. The hybrid headband design ensures even weight distribution for extended comfort.
- 音量コントロール: Adjust the volume using the controls on your connected audio source. The SUNDARA headphones feature a high sensitivity of 94 dB and an impedance of 32 Ohms, making them relatively easy to drive with various devices. However, for the best performance, especially with demanding audio, a dedicated headphone amplifier may be beneficial.
- リスニング環境: As open-back headphones, the SUNDARA provides a wide soundstage but offers minimal noise isolation. They are best used in quiet environments to fully appreciate their sonic capabilities.

図3:側面 view of the SUNDARA earcup
5. メンテナンスとケア
Proper care will extend the life and maintain the performance of your HIFIMAN SUNDARA headphones:
- イヤーパッドのクリーニング: The updated earpads are designed for comfort. Gently wipe them with a soft, dry cloth. Avoid using harsh chemicals or abrasive materials.
- ヘッドバンドのクリーニング: Wipe the headband with a soft, slightly damp 布で拭いてください。内部部品に水分が入らないようにしてください。
- ケーブルのお手入れ: The headphone cable is detachable. When disconnecting, always grasp the connector housing, not the cable itself. Avoid sharp bends or excessive pulling on the cable.
- ストレージ: Store your headphones in a clean, dry place away from direct sunlight and extreme temperatures. Using a headphone stand or the original packaging is recommended to prevent damage.
- 耐水性: このヘッドフォンは防水ではありません。液体に濡らさないでください。

Figure 4: Close-up of SUNDARA earpads
6。 トラブルシューティング
If you encounter issues with your HIFIMAN SUNDARA headphones, refer to the following common problems and solutions:
| 問題 | 考えられる原因 | 解決 |
|---|---|---|
| 音が出ない、または音量が小さい |
|
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| Distorted or unbalanced sound |
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| ヘッドホンが不快 |
|
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If the problem persists after trying these solutions, please contact HIFIMAN customer support.
7. 仕様
| 特徴 | 詳細 |
|---|---|
| モデル名 | スンダラ |
| 商品型番 | HE-20 |
| オーディオドライバータイプ | 平面磁気ドライバー |
| 耳の位置 | オーバーイヤー |
| フォームファクター | オーバーイヤー |
| 接続技術 | 有線 |
| ヘッドフォンジャック | 3.5ミリジャック |
| ハードウェアインターフェイス | 3.5mmオーディオ |
| ケーブル機能 | 取り外し可能 |
| インピーダンス | 32オーム |
| 感度 | 94デシベル |
| 騒音制御 | なし(オープンバックデザイン) |
| 材料 | Aluminum (frame), Plastic or Leather (earpads/headband) |
| アイテム重量 | 1.3ポンド(約590g) |
| 製品寸法 | 10.63 x 6.3 x 11.81インチ |
| 耐水性レベル | 耐水性はありません |
| 含まれるコンポーネント | 3.5mm-to-6.35mm Adapter, Cable |
| 対応デバイス | 携帯電話、ノートパソコン、タブレット |
| 推奨用途 | Audio Monitoring, Recording |
8. 保証情報
HIFIMAN products are covered by a manufacturer's warranty against defects in materials and workmanship. The specific terms and duration of the warranty may vary by region and retailer. Please retain your proof of purchase for warranty claims.
For detailed warranty information, including coverage, exclusions, and how to make a claim, please refer to the official HIFIMAN webサイトをご覧いただくか、正規販売店にお問い合わせください。
9. カスタマーサポート
If you have any questions, require technical assistance, or need further support regarding your HIFIMAN SUNDARA headphones, please contact HIFIMAN customer service through their official webサイトまたは製品パッケージに記載されている連絡先情報をご覧ください。
また、 AmazonのHIFIMANストア 追加の製品情報とリソースについては、こちらをご覧ください。