Introduction
Thank you for choosing the Questyle M12i HiFi Headphone Amplifier. This portable USB DAC is designed to deliver high-resolution audio, supporting PCM up to 768kHz/32bit and DSD512. It features an ESS ES9281AC DAC chip and patented Current Mode amplifier technology for a clear, low-noise audio experience. This manual provides essential information for setting up, operating, maintaining, and troubleshooting your M12i amplifier.

Image: The Questyle M12i HiFi Headphone Ampamplificateur, montreasing son design compact.
Contenu du colis
Verify that all items listed below are present in your product packaging.
- Casque audio Questyle M12i avec DAC USB Amplificateur x1
- Câble USB-C vers USB-C x1
- Convertisseur USB-C vers USB-A x1
- Manuel d'utilisation x1
- Carte de garantie x1

Image: The Questyle M12i amplifier and its included accessories laid out in the box.
Installation et connexion
The Questyle M12i is designed for broad compatibility across various operating systems and devices.
Compatibilité
- Systèmes d'exploitation : Android, iOS, Windows (10 version 18.3 and above, driver-free), macOS.
- Appareils : Smartphones, computers, tablets, laptops, audio players.

Image: The M12i connected to a smartphone, illustrating its compatibility with iOS, HarmonyOS, Android, macOS, and Windows devices.
Connexion de votre appareil
- Connect one end of the provided Type-C to Type-C cable to the M12i's Type-C interface.
- Connect the other end of the Type-C cable to your source device (smartphone, tablet, laptop, etc.). If your source device uses a USB-A port, use the included Type-C to USB-A converter.
- For Apple Lightning interface devices (iPhone/iPad), an additional MFi-certified Lightning to Type-C adapter (e.g., Questyle LTC02) is required and sold separately.
- Plug your headphones or earphones into the M12i's 3.5mm headphone jack. The M12i is compatible with CTIA communication headphones.

Image: The M12i connected to a laptop via a USB-C cable, with earphones plugged into the amplifier.

Image: The M12i connected to a tablet, demonstrating its use with portable devices for audio playback.
Certification MFi
The "i" in M12i signifies its MFi certification, ensuring full compatibility and seamless integration with iPhone and iPad devices. This certification guarantees adherence to Apple's strict requirements for external devices regarding power consumption and compatibility, minimizing risks to your iOS devices.

Image: The M12i amplifier next to a Lightning cable, highlighting its MFi certification for Apple devices.
Opération
Once connected, the M12i will automatically detect the connected device and headphone impedance, adjusting its output for optimal performance.
Indicateurs
The M12i features indicators to provide information on its operational status.
- Data Status Indicator:
- One red indicator light: Sampling rate is not higher than 48kHz.
- Two red indicators lights: Sampling rate is higher than 48kHz.
- Gain Indicator:
- Single light: Low gain mode.
- Dual lights: High gain mode.

Image : Gros plan view of the M12i showing the data status and gain indicator lights.
Lecture audio
Begin playing audio from your source device. The M12i will process the digital audio signal, converting it to an analog signal and amplifying it for your headphones. Adjust volume directly from your source device.
Entretien
- Veillez à ce que l'appareil reste propre et sec. Utilisez un chiffon doux et sec pour le nettoyer.
- Avoid exposing the M12i to extreme temperatures, humidity, or direct sunlight.
- Ne tentez pas de démonter ou de modifier l'appareil, car cela annulera la garantie.
- Manipulez les câbles et les connecteurs avec précaution pour éviter tout dommage.
Dépannage
Pas de son ou faible volume
- Ensure all cables are securely connected to both the M12i and your source device.
- Verify that your headphones are properly plugged into the M12i's 3.5mm jack.
- Vérifiez le niveau de volume sur votre appareil source.
- Confirm that the M12i is recognized by your source device. For some devices, you may need to select the M12i as the audio output device in system settings.
Déconnexions intermittentes
- Ensure the USB-C cable is firmly seated in both the M12i and the source device.
- Essayez un autre câble USB-C pour éliminer tout problème de câble.
- Avoid putting strain on the connection points, especially when the device is in a pocket or bag.
Poor Sound Quality (Popping, Distortion, Noise)
- Assurez-vous que la source audio est de haute qualité.
- Check if the issue persists with different headphones.
- Verify that the M12i's firmware is up to date. Information on firmware updates can typically be found on the Questyle official website.
- The M12i features an ultra-low noise floor; if you experience noise, ensure your headphones are not excessively sensitive or that there isn't external interference.
Appareil non reconnu par PC/Mac
- For Windows 10 (version 18.3 and above) and macOS, the M12i is driver-free. Ensure your operating system is up to date.
- Essayez de vous connecter à un autre port USB de votre ordinateur.
- Redémarrez votre ordinateur.
Caractéristiques
| Fonctionnalité | Détail |
|---|---|
| Nom du modèle | M12i |
| Puce CNA | ESS ES9281AC |
| Prise en charge du PCM | Jusqu'à 768 kHz/32 bits |
| Prise en charge DSD | Jusqu'au DSD512 |
| Prise pour casque | 3.5 mm Jack (compatible with CTIA communication headphones) |
| Technologie de connectivité | Filaire (USB Type-C) |
| Gamme de fréquences | 20 Hz - ≥ 80 kHz |
| Niveau de bruit | Below -130dB |
| Matériel | Metal (Frosted aluminum body machined by CNC) |
| Dimensions | 2.24 x 0.37 x 0.78 pouces |
| Poids de l'article | 0.48 onces (environ 13.6 grammes) |
| Dossier spécial | Lightweight, Patented Current Mode Amplifier module, TOREX precision power management system, Built-in smart impedance detection |

Image: Diagram illustrating the internal components of the M12i, including the DAC chip, amplifier module, and power management system.
Garantie et assistance
Informations sur la garantie
The Questyle M12i comes with a warranty. Please refer to the included Warranty Card in your package for detailed terms and conditions, including warranty duration and coverage. Keep your proof of purchase for warranty claims.
Service client
For technical assistance, product inquiries, or warranty support, please contact Questyle customer service. Contact details can typically be found on the official Questyle websur le site ou sur la carte de garantie.