Introduction
The Questyle Sigma is a high-performance portable DAC/amplifier designed to elevate your audio experience with smartphones, PCs, and laptops. This manual provides essential information for setting up, operating, and maintaining your device.
Package Contents
Upon unboxing your Questyle Sigma, please ensure all the following items are present:
- Questyle Sigma Portable DAC/Amp Unit
- Type-C to Type-C Cable (12cm)
- Type-C to Type-C Cable (120cm)
- USB-A to Type-C Adapter
- User Manual
- Warranty Card
Image: Contents of the Questyle Sigma package, showing the device, various cables, and user documentation.
Setup
Charging the Device
The Questyle Sigma features a built-in 4300mAh high-capacity battery, providing up to 12 hours of continuous playback. To charge the device, connect it to a 5V/2A power source using one of the provided USB-C cables. The dual USB-C port design allows for charging while listening.
Charging Time: Approximately 3.5 hours.
Connectivity Options
The Sigma offers versatile connectivity for various devices:
- USB Connection: Connect to smartphones (iOS, HarmonyOS, Android 5.1+), PCs (Windows 10 1803+ driverless, macOS), laptops, and tablets using the appropriate USB-C cable or adapter.
- Bluetooth Connection: Utilize Bluetooth 5.4 for wireless audio. The device is certified by Qualcomm Snapdragon Sound and Sony LDAC, supporting aptX HD lossless audio for high-resolution wireless streaming.
Image: The Questyle Sigma demonstrating comprehensive compatibility with mobile and PC devices.
MFi Certification
The Questyle Sigma is officially MFi certified, ensuring seamless and safe compatibility with iPhone, iPad, and Mac devices. This certification guarantees adherence to Apple's stringent requirements for power consumption and external device compatibility, preventing potential damage from uncertified accessories.
Image: MFi Certification for the Questyle Sigma, showing compatibility with Apple devices.
Operating Instructions
Controls and Indicators
The Questyle Sigma features intuitive controls and indicator lights for easy operation. Refer to the diagram below for button functions and LED indicators.
Image: Overview of the Questyle Sigma's controls and ports.
- Power Button: Press and hold to power on/off.
- Volume Controls (+/-): Adjust audio output level.
- Gain Switch: Toggle between different gain levels (e.g., Low, Medium, High) to match your headphones' impedance and sensitivity.
- IEM Mode: A dedicated mode for sensitive In-Ear Monitors (IEMs) to provide precise volume control and minimize signal loss.
- Input/Output Ports: Includes USB DAC input, 3.5mm headphone output, and 4.4mm balanced output.
- LED Indicators: Display battery level, active input (Bluetooth, USB), and gain setting.
Video: An official overview of the Questyle Sigma, demonstrating its features and design, including the transparent window and various ports.
Switching Output Modes
The Sigma allows switching between headphone amplifier mode and line-out mode. Line-out mode is suitable for connecting to professional monitors or Hi-Fi systems. Refer to the device's specific controls for mode selection.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the device. Avoid using harsh chemicals or abrasive materials.
- Storage: Store the device in a cool, dry place away from direct sunlight and extreme temperatures.
- Battery Care: For optimal battery life, avoid fully discharging the device frequently. Charge it regularly.
- Handling: Handle the device with care to prevent drops or impacts, especially given its transparent window design.
Troubleshooting
- No Power: Ensure the device is fully charged. Try connecting to a different USB power source.
- No Audio Output:
- Check headphone connections (3.5mm or 4.4mm balanced).
- Verify the correct input source (USB or Bluetooth) is selected.
- Adjust volume levels on both the Sigma and the connected source device.
- Ensure headphones are properly connected and functional.
- Bluetooth Pairing Issues:
- Ensure the Sigma is in Bluetooth pairing mode.
- Disable and re-enable Bluetooth on your source device.
- Forget the device from your source's Bluetooth list and attempt to re-pair.
- Ensure no other devices are actively connected to the Sigma via Bluetooth.
- Sound Distortion:
- Reduce the volume on both the Sigma and the source device.
- Check the gain setting; a lower gain might be appropriate for sensitive headphones.
- Ensure audio cables are securely connected and not damaged.
Specifications
| Feature | Detail |
|---|---|
| Model Name | Sigma |
| Brand | Questyle |
| Connectivity Technology | Wired, Wireless (Bluetooth 5.4) |
| DAC Chip | AK4493 (with TTA Signal Processing Architecture) |
| Decoding Capabilities | PCM768/DSD512 |
| Amplifier Architecture | Patented Current Mode Amplifier (Fully Discrete, Fully Balanced) |
| Peak Output Power | >5W |
| Peak Output Current | 3A |
| THD | 0.0002% |
| Battery Capacity | 4300mAh Lithium Ion |
| Battery Life | Up to 12 hours |
| Charging Time | 3.5 Hours |
| Compatible Devices | Smartphones, Laptops, Desktops, Tablets, Cellphones (iOS, HarmonyOS, Android 5.1+, Windows 10 1803+, macOS) |
| Bluetooth Codecs | Qualcomm Snapdragon Sound (aptX Adaptive, aptX HD lossless), Sony LDAC |
| Output Ports | 3.5mm (PO OUT), 4.4mm (BAL OUT) |
| Dimensions | 4.33 x 2.75 x 0.59 inches |
| Item Weight | 1.25 pounds |
Image: Key performance specifications of the Questyle Sigma.
Image: TTA Signal Processing Architecture diagram.
Warranty and Support
The Questyle Sigma comes with a warranty as detailed on the included Warranty Card. For specific warranty terms and conditions, please refer to the documentation provided in your product package.
For technical support, service, or further inquiries, please visit the official Questyle website or contact their customer service department. Contact information can typically be found on the product packaging or the Questyle website.
