1. Introduction
The JCALLY JM6 Pro2 is a high-performance portable USB-C to 3.5mm headphone adapter and amplifier designed to elevate your audio experience. Featuring advanced DAC and op-amp chips, it delivers pristine sound quality with broad compatibility across various devices. This manual provides essential information for setup, operation, maintenance, and troubleshooting to ensure optimal use of your JM6 Pro2.
Figure 1: JCALLY JM6 Pro2 Headphone Adapter with USB-A converter.
2. Key Features
- Dual High-Performance Chips: Equipped with a CX31993 DAC chip and MAX97220 op-amp chip for superior audio decoding and amplification.
- High-Resolution Audio Support: Supports PCM up to 32-bit/384kHz and DSD64 for detailed and accurate sound reproduction.
- Powerful Output: Delivers up to 70mW (at 32Ω) to effortlessly drive a wide range of headphones, including high-impedance models.
- Ultra-Low Noise and Distortion: Features a low noise floor (≈5.7μV) and exceptionally low THD+N (≈0.003%) for a clean and pure sound.
- Wide Compatibility: Plug-and-play with most Type-C devices running Android, iOS, Windows (UAC 2.0), and macOS.
- Durable and Portable Design: Small, lightweight (7.6g), and constructed with a metal shell featuring CMP mirror polishing and five-axis CNC curved engraving for enhanced durability and aesthetics.
- Premium Cable: Utilizes an 8-strand, 448-core silver-copper hybrid cable with Qilin spiral design for near-zero signal loss and improved anti-interference.
Figure 2: Visual representation of JM6 Pro2's new design, power output, and ultra-low loss circuitry.
Figure 3: Illustration of the dual CX31993 DAC and MAX97220 op-amp chips for outstanding performance.
3. Setup Guide
3.1 Package Contents
Before you begin, please ensure all items are present in the package:
- 1 × JCALLY JM6 Pro2 Headphone Amplifier
- 1 × User Manual
- 1 × USB Adapter Connector (USB-A to Type-C)
Figure 4: Packaging contents including the JM6 Pro2, warranty card, and USB adapter.
3.2 Connecting the JM6 Pro2
The JM6 Pro2 is designed for plug-and-play functionality. Follow these steps to connect your device:
- Identify the Type-C Connector: Locate the Type-C male connector on the JM6 Pro2.
- Connect to Source Device: Insert the Type-C connector into the Type-C port of your smartphone, tablet, or computer.
- Connect Audio Output: Plug your 3.5mm headphones, earphones, or other audio devices into the 3.5mm female jack of the JM6 Pro2.
- Using the USB Adapter (Optional): If your computer or device only has a standard USB-A port, connect the provided USB Adapter Connector to the JM6 Pro2's Type-C end, then plug the USB-A end into your device.
Figure 5: Diagram showing Type-C and 3.5mm connections for phones, computers, and audio devices.
Video 1: Product demonstration showing connection and usage with a smartphone.
4. Operating Instructions
The JM6 Pro2 is designed for ease of use. Once connected, it should automatically be recognized by your device as an audio output device.
4.1 Basic Operation
- Plug and Play: Simply connect the JM6 Pro2 to your device and headphones. No additional drivers are typically required for most compatible operating systems.
- Automatic Detection: Your device should automatically switch audio output to the JM6 Pro2. You may need to select it manually in your device's audio settings if it doesn't switch automatically.
- Volume Control: Use your source device's volume controls to adjust the audio output level.
4.2 Supported Functions
The JM6 Pro2 supports a variety of audio functions:
- Music Playback: Enjoy high-fidelity audio for all your music.
- Gaming: Experience immersive sound during gaming sessions.
- Live Streaming/Calls: Supports audio for live streaming, phone calls, and video conferences.
- Microphone/Recording: Compatible with headphones that include a microphone for communication and recording purposes.
Note on Remote Control:
The JM6 Pro2 may not support the remote control functions (e.g., play/pause, track skip, volume) of all 3.5mm headphones, especially those with specific standards like Apple's "EarPods with 3.5 mm Headphone Plug". Functionality may vary depending on the headphone and its internal wiring (CTIA vs. OMTP standards).
5. Care and Maintenance
- Keep Dry: Avoid exposing the device to moisture, rain, or liquids.
- Clean Gently: Use a soft, dry cloth to clean the exterior of the JM6 Pro2. Do not use harsh chemicals or abrasive materials.
- Store Properly: When not in use, store the adapter in a clean, dry place away from extreme temperatures.
- Handle with Care: Avoid dropping or subjecting the device to strong impacts.
- Connector Care: Ensure connectors are free from dust and debris before plugging them in.
6. Troubleshooting
If you encounter issues with your JM6 Pro2, please refer to the following common solutions:
- No Sound or Intermittent Audio:
- Ensure all connections are secure and fully inserted.
- Verify that your source device's volume is turned up and not muted.
- Check your device's audio output settings to confirm the JM6 Pro2 is selected.
- Try restarting your mobile phone or computer. Prolonged use without restarting can sometimes cause the Type-C port's data buffer to become full, and a restart can resolve this.
- Test with different headphones or a different source device to isolate the problem.
- Incompatibility Issues:
- The JM6 Pro2 supports most Type-C devices but may not be compatible with all. Ensure your device supports USB Audio Class 2.0 (UAC 2.0). Devices using UAC 1.0 (e.g., Nintendo Switch, PS5 consoles, older Windows 7 computers) are generally not supported.
- Some devices that still retain a built-in 3.5mm headphone jack might have compatibility issues with external DACs.
- If you suspect incompatibility, try testing the JM6 Pro2 with another known compatible device to confirm its functionality.
- Headphone Remote Control Not Working:
- 3.5mm headphones use different standards (CTIA and OMTP). The JM6 Pro2 may not fully support remote control functions for all headphone types due to these variations.
- If remote control is critical, consider using headphones known to be compatible or adjusting controls directly on your source device.
7. Specifications
| Feature | Specification |
|---|---|
| Product Name | JCALLY JM6 Pro2 USB-C to 3.5mm Headphone Adapter & Amplifier |
| Decoding Chip | CX31993 |
| Op-Amp Chip | MAX97220 |
| PCM Sampling Frequencies | Up to 384 kHz |
| PCM Word Length | 32-bit |
| DSD Sampling Frequencies | 2.8224 MHz (DSD64) |
| Output Impedance | ≈0.2Ω (32Ω) |
| Signal-to-Noise Ratio (SNR) | ≈107dB (32Ω, A-wt.) |
| Noise Floor | ≈5.7μV |
| Dynamic Range (DR) | ≈104dB (32Ω) |
| Total Harmonic Distortion + Noise (THD+N) | ≈0.003% (32Ω) |
| Crosstalk | ≈-71dB (32Ω) |
| Output Voltage/Power | ≈70mW (32Ω/THD+N<1%) |
| Inputs | USB Type-C |
| Outputs | 3.5mm RCA |
| Material | Metal (Aluminum shell) |
| Cable | 8-core copper silver hybrid, 448 coils |
| Shell | Aluminum 5 axis CNC curved carving |
| Color | Silver |
| Length | 110 ± 10mm |
| Net Weight | 7.6g ± 1g |
| Gross Weight | 45g ± 5g |
| USB Compatibility | Windows 7, Windows 8, Windows 10, iOS, Android (UAC 2.0) |
| Not Compatible With | Devices using UAC 1.0 (e.g., Nintendo Switch, PS5 consoles, Windows 7 computers) |
Figure 6: Comprehensive product specifications including DAC chip, PCM, SNR, and physical dimensions.
Figure 7: Performance comparison table highlighting improvements in Noise, THD+N, Output Impedance, and SINAD.
8. User Tips
- Initial Check: Always confirm that your connected devices (phone, tablet, headphones) are functioning correctly before using the adapter.
- Restart for Connectivity: If the adapter suddenly stops working, try restarting your mobile phone. Prolonged use without restarting can sometimes cause the Type-C port to become unresponsive due to accumulated data.
- Headphone Compatibility: Be aware that 3.5mm headphones come in different standards (CTIA and OMTP). If you experience issues like no voice or only accompaniment, try a different pair of headphones to ensure compatibility.
- Optimal Sound: For the best audio experience, use high-quality audio files and headphones.
9. Warranty and Support
For detailed warranty information and customer support, please refer to the official product documentation or contact your retailer.
A comprehensive user manual is also available in PDF format for download: Download User Manual (PDF).
