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 Amplifier, showcasing its compact design.
Package Contents
Verify that all items listed below are present in your product packaging.
- Questyle M12i USB DAC Headphone Amplifier x1
- Type-C to Type-C cable x1
- Type-C to USB-A Converter x1
- User Manual x1
- Warranty Card x1
Image: The Questyle M12i amplifier and its included accessories laid out in the box.
Setup and Connection
The Questyle M12i is designed for broad compatibility across various operating systems and devices.
Compatibility
- Operating Systems: Android, iOS, Windows (10 version 18.3 and above, driver-free), macOS.
- Devices: Smartphones, computers, tablets, laptops, audio players.
Image: The M12i connected to a smartphone, illustrating its compatibility with iOS, HarmonyOS, Android, macOS, and Windows devices.
Connecting Your Device
- 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.
MFi Certification
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.
Operation
Once connected, the M12i will automatically detect the connected device and headphone impedance, adjusting its output for optimal performance.
Indicators
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: Close-up view of the M12i showing the data status and gain indicator lights.
Audio Playback
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.
Maintenance
- Keep the device clean and dry. Use a soft, dry cloth for cleaning.
- Avoid exposing the M12i to extreme temperatures, humidity, or direct sunlight.
- Do not attempt to disassemble or modify the device, as this will void the warranty.
- Handle cables and connectors with care to prevent damage.
Troubleshooting
No Sound or Low 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.
- Check the volume level on your source device.
- 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.
Intermittent Disconnections
- Ensure the USB-C cable is firmly seated in both the M12i and the source device.
- Try using a different USB-C cable to rule out cable issues.
- Avoid putting strain on the connection points, especially when the device is in a pocket or bag.
Poor Sound Quality (Popping, Distortion, Noise)
- Ensure the audio source is of high quality.
- 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.
Device Not Recognized by 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.
- Try connecting to a different USB port on your computer.
- Restart your computer.
Specifications
| Feature | Detail |
|---|---|
| Model Name | M12i |
| DAC Chip | ESS ES9281AC |
| PCM Support | Up to 768kHz/32bit |
| DSD Support | Up to DSD512 |
| Headphones Jack | 3.5 mm Jack (compatible with CTIA communication headphones) |
| Connectivity Technology | Wired (USB Type-C) |
| Frequency Range | 20 Hz - ≥ 80 kHz |
| Noise Floor | Below -130dB |
| Material | Metal (Frosted aluminum body machined by CNC) |
| Dimensions | 2.24 x 0.37 x 0.78 inches |
| Item Weight | 0.48 ounces (approx. 13.6 grams) |
| Special Feature | 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.
Warranty and Support
Warranty Information
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.
Customer Service
For technical assistance, product inquiries, or warranty support, please contact Questyle customer service. Contact details can typically be found on the official Questyle website or on the Warranty Card.
