Introduction
The JCALLY JM20 series offers high-performance DAC decoder headphone amplifier adapters designed to enhance your audio experience across various devices. These compact and portable adapters convert a Type-C digital audio signal to a 3.5mm analog output, providing superior sound quality for music enthusiasts. With durable construction and versatile compatibility, the JM20 series is a reliable choice for on-the-go high-fidelity audio.
Product Overview
The JCALLY JM20 series includes three main models: JM20, JM20 PRO, and JM20 MAX, each offering distinct features and performance levels. All models are designed for plug-and-play functionality, instantly upgrading your audio experience.
Key Features Across Models:
- High Performance DAC Chip: All models feature the CS43131 DAC chip for superior audio decoding. The JM20 MAX further integrates an SGM8262 OPAMP chip.
- Wide Compatibility: Supports Android, Windows, and MacOS systems, connecting to phones, tablets, and computers via Type-C.
- Durable Construction: Built with quality materials like aluminum alloy shells and silver-plated copper cables for longevity.
Model Specifics:
- JM20: Focuses on pure Hifi stereo output. Does not support wire control or phone calls.
- JM20 PRO: Adds support for microphone and phone calls, along with 8-class EQ adjustment. Features an 8-strand, 392-core silver-plated copper cable.
- JM20 MAX: Designed for professional Hifi music, featuring a dual-chip (CS43131 + SGM8262) configuration for enhanced power. This model does NOT support phone calls or microphone input. It includes a multi-function indicator light for different audio modes.
Setup Instructions
The JCALLY JM20 series adapters are designed for ease of use with plug-and-play functionality.
- Connect to Source Device: Insert the Type-C connector of the adapter into the Type-C port of your smartphone, tablet, or computer.
- Connect Headphones/Audio Device: Plug your 3.5mm headphones, earphones, or other audio equipment into the 3.5mm jack of the adapter.
- Computer Connection (Optional): For Windows/MacOS computers, you may need a USB-C to USB-A adapter (not included) if your computer lacks a Type-C port. Once connected, the system should automatically recognize the DAC.
Operating Instructions
Once connected, your device should automatically route audio through the JCALLY adapter.
- Audio Playback: Simply play your desired audio content (music, videos, etc.) from your source device. The adapter will process the digital signal and output high-fidelity analog audio to your connected headphones.
- JM20 PRO Microphone/Phone Call: If you have the JM20 PRO model and your connected headphones have a microphone, you can use it for phone calls and voice input. The 8-class EQ adjustment feature allows for sound customization.
- JM20 MAX Indicator Light: The JM20 MAX features an indicator light that changes color based on the audio mode:
- Blue Light: Standby Mode
- Red Light: DSD Mode
- Green Light: PCM Mode
Maintenance
To ensure the longevity and optimal performance of your JCALLY DAC adapter, follow these maintenance guidelines:
- Keep Dry: Avoid exposing the adapter to moisture, liquids, or high humidity.
- Avoid Extreme Temperatures: Do not store or operate the adapter in extremely hot or cold environments.
- Handle Gently: Avoid bending, twisting, or pulling the cable excessively. Always grasp the connectors when plugging or unplugging.
- Cleaning: Use a soft, dry, lint-free cloth to clean the adapter's surface. Do not use harsh chemicals or abrasive materials.
- Storage: When not in use, store the adapter in a clean, dry place, preferably in its original packaging or a protective pouch.
Troubleshooting
If you encounter issues with your JCALLY DAC adapter, refer to the following common troubleshooting steps:
- No Sound Output:
- Ensure the adapter is fully inserted into both your source device and headphones.
- Check the volume levels on your source device and connected audio equipment.
- Verify that your source device's audio output is set to the USB-C audio device (if applicable in settings).
- Test with another pair of headphones or another compatible source device to isolate the issue.
- Poor Sound Quality (Distortion, Low Volume):
- Ensure your audio files are of good quality.
- Check if the issue persists with different headphones or source devices.
- For JM20 PRO, ensure EQ settings are not causing undesirable effects.
- Device Not Recognized:
- Unplug and re-plug the adapter.
- Restart your source device.
- If using a computer, try a different USB-C port or a different USB-C to USB-A adapter.
- Ensure your device's operating system is up to date.
- Microphone/Phone Call Issues (JM20 PRO):
- Confirm your headphones have a working microphone.
- Some Huawei mobile phones may not support phone call functions through the adapter. If this is a critical feature for you and your device, please verify compatibility.
- No Microphone/Phone Call Support (JM20 & JM20 MAX):
- Remember that the JM20 and JM20 MAX models are designed exclusively for Hifi music output and do not support microphone input or phone call functions. This is normal operation for these models.
Specifications
JCALLY JM20
| Feature | Detail |
|---|---|
| Model | JM20 |
| DAC Chip | CS43131 |
| PCM | 32bits/384KHz |
| SNR/DNR | >120dB |
| Distortion (THD-N) | 0.0003% (32 Ω load, 1.2vrms) |
| DSD | Native DSD64, DSD128, DSD256 |
| Output Power | 0.95Vrms@32Ω, 2Vrms@600Ω |
| Bottom Noise | < 0.9 μV |
| Weight | 5g ± 0.5g |
| Length | Approx. 120mm |
| Wire Core Type | Copper core |
| Color | Sterling Silver |
| Function | Hifi stereo output only, no wire control/microphone |
JCALLY JM20 PRO
| Feature | Detail |
|---|---|
| Model | JM20 PRO |
| DAC Chip | CS43131 |
| PCM | 32bits/384KHz |
| DSD | DSD256 (1bits 11.2MHz) |
| SNR | >120dB |
| THD-N | -105dB |
| Crosstalk | -70dB |
| DR | 120dB |
| Output Voltage | 31.25mW@32Ω |
| Indicator | Standby: Blue, PCM: Green, DSD: Red |
| Function | Support microphone/phone call, 8 class EQ adjustment |
| Color | Nebulas Blue |
| Weight | 6.5g ± 0.5g |
| Length | 110mm ± 10mm |
| Wire Core Type | 8 Strand 392 Cores Silver Plated Copper |
JCALLY JM20 MAX
| Feature | Detail |
|---|---|
| Model | JM20 MAX |
| Main DAC Chip | Cirrus Logic CS43131 |
| OPAMP Chip | SGM8262 |
| PCM | 32bits/384KHz |
| DSD | DSD256 (1bits 11.2MHz) |
| SNR | >126dB |
| DR | 122dB |
| Crosstalk | -140dB |
| Distortion | -112dB |
| Output Voltage | 195mW@32Ω, 10.8mW@600Ω |
| Output Load Adaptive | 16Ω~600Ω |
| Frequency Response (FR) | 20Hz~20KHz |
| Function | Professional amplifier, support Hifi music (No phone call/microphone support) |
| Application | TYPE-C phones, tablets, computers; supports HiBy, Viper tec app players |
| Cable Material | 392 coils 8 cores cable, silver-plated conductor |
| Shell Material | Aluminum CNC Carving shell, anodized matte silver spray |
| Color | Silver |
| Dimension | 110mm ± 10mm |
| Net Weight | 6.5g |
| Gross Weight | 15g |
User Tips
- Model Differences: Be aware that the JM20, JM20 PRO, and JM20 MAX models have different features, particularly regarding microphone and phone call support. Always check the specific model you own for full functionality.
- Compatibility with Huawei: Note that some Huawei mobile phones may not support phone call functions when using the JM20 PRO adapter. If this is a crucial feature, verify compatibility with your specific Huawei model.
- Optimal Audio Quality: For the best audio experience, use high-quality audio files and compatible headphones.
- Computer Use: When connecting to a computer, ensure your operating system's audio output settings are correctly configured to use the DAC adapter.
Warranty and Support
For any product inquiries, technical support, or warranty claims, please contact JCALLY customer service or the authorized retailer where you purchased the product. Keep your proof of purchase for warranty validation.
