JCALLY JM45/JM45L Portable DAC Headphone Amplifier User Manual

1. Introduction

Thank you for choosing the JCALLY JM45/JM45L Portable DAC Headphone Amplifier. This device is designed to enhance your audio experience by providing high-fidelity sound decoding and amplification for your headphones. Featuring an ESS ES9318 DAC chip, pure silver coil, and durable construction, it delivers outstanding performance for both Type-C and Lightning-enabled devices.

2. Product Overview

The JCALLY JM45 and JM45L are compact digital audio decoding adapters that connect to your smartphone or other compatible devices via USB Type-C (JM45) or Lightning (JM45L) and provide a 3.5mm audio output for your headphones. They are engineered for immersive sound quality with high-resolution audio support.

Figure 1: JCALLY JM45/JM45L Product Overview with key features.

Key Features:

• High-Fidelity DAC Chip: Equipped with the ESS ES9318 digital audio code chip for superior sound decoding.
• High-Resolution Audio: Supports PCM 32bit/384kHz and DSD256 for detailed and clear audio reproduction.
• Noise Reduction: Designed with high fidelity noise reduction for a cleaner audio signal.
• Durable Construction: Features a TID certified plug, aluminum outer shell, and pure silver coil for enhanced durability and sound quality.
• Versatile Compatibility: Available in Type-C (JM45) for Android phones, tablets, and computers, and Lightning (JM45L) for Apple devices.
• Multifunction Support: Supports phone calls, K Song/U key functions, live streaming, and gaming.

3. Specifications

The following table details the technical specifications for the JCALLY JM45 and JM45L models:

Figure 2: Internal DAC chip (ESS ES9318) and its capabilities.

4. Setup Instructions

The JCALLY JM45/JM45L is designed for plug-and-play operation. No additional drivers or software are typically required for most operating systems.

Connecting to your Device:

1. Identify your model:
   • If you have the JM45 (Type-C) model, ensure your device has a USB Type-C port.
   • If you have the JM45L (Lightning) model, ensure your device has a Lightning port (e.g., iPhone, iPad).
2. Connect Headphones: Plug your 3.5mm headphones or earphones into the 3.5mm audio jack on the JCALLY adapter.
3. Connect to Source Device:
   • For JM45 (Type-C): Insert the USB Type-C connector of the adapter into the Type-C port of your smartphone, tablet, or computer.
   • For JM45L (Lightning): Insert the Lightning connector of the adapter into the Lightning port of your Apple device.
4. Verify Connection: Your device should automatically recognize the adapter as an external audio output device. You may need to select it as the default audio output in your device's sound settings if it doesn't switch automatically.

Figure 3: JM45 (Type-C) connected to a smartphone.

Figure 4: JM45L (Lightning) connected to an Apple device.

5. Operating Instructions

Once connected, the JCALLY JM45/JM45L functions as your device's primary audio output. You can control playback and volume directly from your source device.

Audio Playback:

• Start playing audio (music, video, game) on your connected device.
• Sound will be routed through the JCALLY adapter to your connected headphones.
• Adjust volume using your device's volume controls.

Call and Microphone Support:

Both JM45 and JM45L models support microphone input for phone calls, K Song/U key functions, and in-game communication, provided your connected headphones have an inline microphone.

• Ensure your headphones have a 3.5mm TRRS (4-pole) plug for microphone functionality.
• During a call or voice application, the adapter will automatically handle audio input and output.

6. Maintenance

To ensure the longevity and optimal performance of your JCALLY JM45/JM45L adapter, follow these simple maintenance guidelines:

• Cleaning: Use a soft, dry cloth to wipe the adapter. Avoid using liquid cleaners or solvents.
• Storage: Store the adapter in a cool, dry place away from direct sunlight and extreme temperatures.
• Handling: Avoid excessive bending or pulling on the cable, especially near the connectors, to prevent internal damage. The cable is designed for durability with a 10,000-bend test rating, but careful handling is always recommended.
• Connector Care: Keep the USB Type-C/Lightning and 3.5mm connectors free from dust and debris. Use a soft brush or compressed air if necessary.

Figure 5: Durable construction details of the JM45 (Type-C) adapter.

7. Troubleshooting

If you encounter issues with your JCALLY JM45/JM45L adapter, please refer to the following common problems and solutions:

No Sound Output:

• Check Connections: Ensure both the adapter and your headphones are securely plugged into their respective ports.
• Device Recognition: Verify that your source device recognizes the adapter. On some devices, you might need to manually select the adapter as the audio output in sound settings.
• Volume Levels: Confirm that the volume on your source device is not muted or set too low.
• Compatibility: Ensure your device's operating system is compatible with external DACs. While generally plug-and-play, some older or highly customized systems might require specific settings.
• Test with Another Device/Headphones: Try the adapter with a different pair of headphones or a different compatible source device to isolate the problem.

Poor Sound Quality (Distortion, Low Volume):

• Source Audio Quality: Ensure the audio file or streaming service you are using is of high quality.
• Headphone Impedance: While the adapter supports a wide range (16Ω-600Ω), extremely high impedance headphones might require more power than a portable adapter can provide for optimal volume.
• Cable Integrity: Inspect the adapter cable and your headphone cable for any visible damage.
• Clean Connectors: Dust or debris in the connectors can affect sound quality. Clean them gently.

Microphone Not Working:

• Headphone Type: Confirm your headphones have a 3.5mm TRRS (4-pole) plug and an integrated microphone.
• Device Settings: Check your device's microphone input settings to ensure the external adapter is selected.
• Application Permissions: Ensure the application you are using (e.g., calling app, game) has permission to access the microphone.

8. User Tips

• Optimal Audio Experience: For the best sound quality, use high-resolution audio files (FLAC, WAV, DSD) and high-quality headphones.
• Volume Control: Always start with a low volume setting on your device before playing audio to protect your hearing and prevent speaker damage.
• Portability: The compact size makes it ideal for on-the-go use. Consider a small pouch to protect it when not in use.

9. Warranty and Support

JCALLY products are manufactured with high standards of quality and performance. This product comes with a one-year warranty from the date of purchase, covering manufacturing defects.

For warranty claims or technical support, please contact your retailer or the official JCALLY support channel with your purchase details.

Please note that the warranty does not cover damage caused by misuse, accidents, unauthorized modifications, or normal wear and tear.