1. Introduction
The eSynic Portable Headphone Amplifier is designed to enhance your audio experience by providing high-fidelity amplification for a wide range of headphones. Engineered with a dual-voltage (±4V) circuit, it delivers pristine audio reproduction across 16-150Ω impedance ranges, achieving over 100dB Signal-to-Noise Ratio (SNR) and ultra-low distortion for uncolored monitoring accuracy. Its compact and durable aluminum alloy design makes it ideal for on-the-go use with various audio devices.
2. Package Contents
The package includes the eSynic Portable Headphone Amplifier unit, a user's manual, a 30cm audio cable, and a 1.2m USB power cable. Ensure all items are present upon unboxing.
- 1 x eSynic Headphone Amplifier
- 1 x User's Manual
- 1 x 30cm Audio Cable
- 1 x 1.2m USB Power Cable
3. Product Overview
The eSynic Headphone Amplifier features a durable aluminum matte surface for comfortable handling and reduced signal interference. It includes a 3.5mm AUX input and output, a power indicator, and an On/Off/Volume control knob on the front. The side features a headset gain switch (H/L), a charging indicator, and a Micro USB port for charging.
Key Components:
- Headset Jack (Output): 3.5mm port for connecting headphones.
- 3.5mm AUX Input: For connecting audio sources like phones, MP3 players, or PCs.
- Power Indicator: LED light indicating power status.
- On/Off/Volume Control: Rotary knob to power on/off and adjust volume.
- Headset Gain Switch (H/L): Selectable gain settings (Low: 16-32Ω for IEMs/earbuds; High: 50-150Ω for monitoring headphones) to match transducer requirements and enhance signal input.
- Charging Indicator: LED light indicating charging status (Red for charging, Green for full charge).
- Micro USB Port: For charging the internal 1000mAh lithium battery.
4. Setup and Operation
4.1. Initial Charging
Before first use, fully charge the amplifier. Connect the supplied USB power cable to the Micro USB port on the amplifier and the other end to a 5V/1A power adapter (not included) or a USB port on a computer. The charging indicator will show a red light during charging and turn green when fully charged. A full charge provides over 8 hours of continuous playback.
4.2. Connecting Your Devices
- Connect your audio source (e.g., smartphone, MP3 player, laptop) to the amplifier's INPUT port using the provided 3.5mm audio cable.
- Connect your headphones or speakers to the amplifier's OUTPUT port.
- Turn the On/Off/Volume Control knob clockwise to power on the amplifier. The power indicator light will illuminate.
- Adjust the volume to your desired listening level.
- Use the Headset Gain Switch (H/L) on the side to select the appropriate gain setting for your headphones. 'L' (Low) is suitable for headphones with impedance between 16-32Ω, while 'H' (High) is for headphones with impedance between 50-150Ω.
The amplifier supports headphones with impedance ranging from 16Ω to 150Ω, ensuring compatibility with a wide variety of audio equipment.
Demonstration Video:
This video demonstrates the unboxing, setup, and basic operation of the eSynic Portable Headphone Amplifier, including connecting devices and using the gain switch.
5. Specifications
| Feature | Detail |
|---|---|
| Model Name | eSynic Headphone Amplifier-B (ESYESY200) |
| Material | Aluminum Alloy (6061) |
| Connectivity Technology | Wired (3.5mm AUX) |
| Headphones Jack | 3.5 mm Jack |
| Impedance Range | 16-150Ω (Ohms) |
| THD+N | 0.0003% |
| SNR | >100dB |
| Battery Type | 1000mAh Lithium Polymer (included) |
| Battery Life | Up to 8 hours (continuous playback) |
| Charging Interface | Micro USB (DC 5V) |
| Product Dimensions | 95 × 52 × 13mm (approx. 3.74 x 2.05 x 0.51 inches) |
| Item Weight | 5 ounces |
6. Troubleshooting
- No Sound:
- Ensure the amplifier is powered on and the volume knob is turned up.
- Check all cable connections (input and output) are secure.
- Verify the audio source is playing and its volume is not muted or too low.
- Ensure headphones are properly connected and functional.
- Distorted Sound:
- Check if the gain switch (H/L) is set appropriately for your headphones' impedance. Incorrect gain can cause distortion.
- Reduce the volume from both the audio source and the amplifier.
- Ensure the audio cables are not damaged.
- Low Volume:
- Increase the volume using the amplifier's knob and from your audio source.
- Ensure the gain switch is set to 'H' (High) if your headphones require more power (50-150Ω).
- Check if the amplifier battery is low and needs charging.
- Charging Issue:
- Ensure the Micro USB cable is securely connected to both the amplifier and the power source.
- Verify the power adapter is working and provides 5V/1A output.
- Try a different USB cable or power source.
7. Safety Information
- Do not expose the device to extreme temperatures, humidity, or direct sunlight.
- Avoid dropping or subjecting the device to strong impacts.
- Do not attempt to disassemble or modify the amplifier. This will void the warranty and may cause damage.
- Keep out of reach of children.
- Use only specified charging cables and power adapters.
- Prolonged listening at high volumes may cause hearing damage.
8. Warranty and Support
eSynic products come with a standard manufacturer's warranty. For detailed warranty information, technical support, or customer service inquiries, please refer to the contact information provided on the product packaging or visit the official eSynic website. Please retain your proof of purchase for warranty claims.
Manufacturer: eSynic